260+ Clinical Calculators & Decision Rules

Medical Tools & Calculators

Evidence-Based Clinical Calculators. Trusted by Healthcare Professionals for fast and accurate decision making.

Showing 260 tools

BMI Calculator

Calculate Body Mass Index based on height and weight.

General

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Body Surface Area (BSA)

Calculate BSA using the Mosteller formula.

General

Pharmacology

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Wells' Criteria for DVT

Calculates the pre-test probability of Deep Vein Thrombosis.

Internal Medicine

Emergency

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CHA₂DS₂-VASc Score for Atrial Fibrillation Stroke Risk

Calculates stroke risk for patients with atrial fibrillation.

Cardiology

Internal Medicine

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Glasgow Coma Scale (GCS)

Assesses the level of consciousness after neurological injury.

Neurology

Emergency

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HAS-BLED Score

Assesses bleeding risk in patients on anticoagulation therapy.

Cardiology

Hematology

Open Tool

MELD Score Calculator

Calculates the Model for End-Stage Liver Disease (MELD) score to assess severity of chronic liver disease.

Scoring System

Open Tool

qSOFA Score

Quick Sequential Organ Failure Assessment for sepsis risk.

Emergency

Internal Medicine

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Centor Score

Estimates probability of streptococcal pharyngitis.

Internal Medicine

Emergency

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Ideal Body Weight (IBW)

Calculate ideal body weight using the Devine formula.

General

Laboratory

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Mean Arterial Pressure (MAP)

Calculate MAP based on Systolic and Diastolic Blood Pressure.

Cardiology

Emergency

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CURB-65 Score for Pneumonia

Estimates mortality of community-acquired pneumonia to help determine inpatient vs. outpatient treatment.

Pulmonology

Emergency

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HEART Score for Major Cardiac Events

Predicts 6-week risk of major adverse cardiac events (MACE).

Cardiology

Emergency

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Wells' Criteria for Pulmonary Embolism

Calculates the pre-test probability of Pulmonary Embolism (PE).

Pulmonology

Emergency

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TIMI Risk Score for UA/NSTEMI

Estimates 14-day mortality, new MI, or urgent revascularization risk in UA/NSTEMI.

Cardiology

Emergency

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Corrected Calcium

Adjusts total serum calcium for hypoalbuminemia.

Laboratory

Internal Medicine

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Anion Gap

Calculates the serum anion gap to evaluate metabolic acidosis.

Laboratory

Internal Medicine

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Creatinine Clearance (Cockcroft-Gault)

Estimates renal function for drug dosing using the Cockcroft-Gault equation.

Nephrology

Pharmacology

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eGFR (CKD-EPI 2021)

Estimates glomerular filtration rate using the 2021 race-free equation.

Nephrology

Internal Medicine

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Corrected QT (QTc)

Calculates the QTc interval using Bazett's formula.

Cardiology

Emergency

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SOFA Score

Sequential Organ Failure Assessment score for predicting ICU mortality.

APGAR Score

Assesses the health of a newborn immediately after birth.

Pediatrics

Obstetrics & Gynecology

Open Tool

Child-Pugh Score

Estimates cirrhosis severity and survival.

Gastroenterology

Internal Medicine

Open Tool

Alvarado Score (MANTRELS)

Evaluates the likelihood of acute appendicitis.

Surgery

Emergency

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Parkland Formula for Burns

Calculates fluid resuscitation requirements for burn patients.

Emergency

Surgery

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Maintenance Fluids (4-2-1 Rule)

Calculates hourly IV fluid rate using the 4-2-1 rule.

Pediatrics

General

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Fractional Excretion of Sodium (FeNa)

Differentiates prerenal disease from acute tubular necrosis (ATN).

Nephrology

Internal Medicine

Open Tool

Corrected Sodium in Hyperglycemia

Calculates true serum sodium in the setting of hyperglycemia.

Endocrinology

Internal Medicine

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ABCD² Score for TIA

Estimates stroke risk after a transient ischemic attack (TIA).

Neurology

Emergency

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BODE Index for COPD

Predicts survival in patients with Chronic Obstructive Pulmonary Disease.

Pulmonology

Internal Medicine

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Adjusted Body Weight (AjBW)

Calculates Adjusted Body Weight for drug dosing in obese patients.

General

Pharmacology

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Lean Body Weight (Boer)

Calculates lean body weight, useful for anesthesia and drug dosing.

General

Pharmacology

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Oxygenation Index (OI)

Assesses the severity of hypoxic respiratory failure.

Respiratory

Critical Care

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PaO₂/FiO₂ (P/F) Ratio

Assesses ARDS severity by comparing arterial oxygen to inspired oxygen.

Respiratory

Critical Care

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A-a Gradient

Calculates the alveolar-arterial oxygen gradient to determine causes of hypoxia.

Respiratory

Internal Medicine

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Absolute Neutrophil Count (ANC)

Calculates the true number of neutrophils to assess infection risk.

Hematology

Oncology

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Total Iron Deficit (Ganzoni Equation)

Calculates the total iron deficit for intravenous iron replacement.

Hematology

Internal Medicine

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MDRD eGFR

Estimates GFR using the MDRD equation.

Nephrology

Internal Medicine

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Sodium Deficit in Hyponatremia

Calculates total body sodium deficit for correction.

Nephrology

Internal Medicine

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Free Water Deficit

Calculates the free water deficit in hypernatremia.

Nephrology

Internal Medicine

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Calculated Serum Osmolality

Calculates expected serum osmolality from basic metabolic panel.

Laboratory

Nephrology

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Osmolar Gap

Calculates the difference between measured and calculated osmolality.

Laboratory

Toxicology

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Hypernatremia Correction Rate (Adrogué-Madias)

Calculates the expected change in serum sodium per liter of IV fluid.

Nephrology

Internal Medicine

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Hyponatremia Correction Rate (Adrogué-Madias)

Calculates the expected change in serum sodium per liter of IV fluid.

Nephrology

Internal Medicine

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Potassium Deficit

Estimates total body potassium deficit in hypokalemia.

Nephrology

Internal Medicine

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Corrected Reticulocyte Count

Adjusts the reticulocyte percentage for the degree of anemia.

Hematology

Internal Medicine

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Mentzer Index

Differentiates Iron Deficiency Anemia from Beta-Thalassemia Trait.

Hematology

Pediatrics

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HbA1c to Estimated Average Glucose (eAG)

Converts HbA1c percentage to an average daily blood glucose level.

Endocrinology

Internal Medicine

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Shock Index (SI)

Identifies early hypovolemic or hemorrhagic shock.

Emergency

Surgery

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Modified Rankin Scale (mRS)

Measures the degree of disability or dependence in daily activities after a stroke.

Neurology

Rehabilitation

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MELD-Na Score

Predicts 90-day survival in patients with advanced liver disease.

Gastroenterology

Internal Medicine

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Maddrey's Discriminant Function

Assesses severity of alcoholic hepatitis and indication for steroids.

Gastroenterology

Internal Medicine

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Glasgow-Blatchford Bleeding Score (GBS)

Screens for upper GI bleed patients needing medical intervention.

Gastroenterology

Emergency

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TIMI Risk Score for STEMI

Estimates 30-day mortality for patients with ST-Elevation MI.

Cardiology

Emergency

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Duke Treadmill Score (DTS)

Estimates prognosis and severity of coronary artery disease.

Cardiology

Internal Medicine

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Canadian C-Spine Rule

Decision rule to safely rule out cervical spine injury in trauma.

Emergency

Surgery

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Ottawa Ankle and Foot Rules

Determines if radiographs are needed for acute ankle/midfoot injuries.

Emergency

Orthopedics

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NEXUS Criteria for C-Spine Imaging

Decision rule to clear the cervical spine without imaging.

Emergency

Surgery

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Pediatric Glasgow Coma Scale (pGCS)

Assesses level of consciousness in pre-verbal children and infants.

Pediatrics

Neurology

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Absolute Lymphocyte Count (ALC)

Calculates the true number of lymphocytes in the blood.

Hematology

Internal Medicine

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Hunt and Hess Scale

Predicts mortality in subarachnoid hemorrhage (SAH).

Neurology

Neurosurgery

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Fisher Grade

Predicts the risk of cerebral vasospasm after subarachnoid hemorrhage.

Neurology

Radiology

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Intracerebral Hemorrhage (ICH) Score

Estimates 30-day mortality for spontaneous intracerebral hemorrhage.

Neurology

Neurosurgery

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HOMA-IR

Estimates insulin resistance from fasting glucose and insulin.

Endocrinology

Internal Medicine

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HOMA-B

Estimates pancreatic beta-cell function from fasting glucose and insulin.

Endocrinology

Internal Medicine

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Estimated Due Date (EDD)

Calculates the Estimated Due Date (EDD) using Naegele's rule.

Obstetrics

Primary Care

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Pediatric Maintenance Fluids (4-2-1 Rule)

Calculates hourly IV fluid requirements for children.

Pediatrics

Emergency

Open Tool

McIsaac Score (Modified Centor)

Estimates the probability of Group A Streptococcal pharyngitis.

Infectious Disease

Pediatrics

Open Tool

FeverPAIN Score

Predicts likelihood of streptococcal pharyngitis and guides antibiotics.

Infectious Disease

Primary Care

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Modified Early Warning Score (MEWS)

Identifies hospitalized patients at risk for clinical deterioration.

Internal Medicine

Emergency

Open Tool

Revised Geneva Score

Estimates clinical probability of Pulmonary Embolism (PE).

Pulmonology

Cardiology

Open Tool

Rapid Shallow Breathing Index (RSBI)

Predicts the success of weaning from mechanical ventilation.

Pulmonology

Critical Care

Open Tool

Bishop Score

Assesses cervical readiness for labor induction.

Obstetrics

Open Tool

Rule of Nines

Estimates Total Body Surface Area (TBSA) of adult burn injuries.

Emergency

Surgery

Open Tool

ECOG Performance Status

Standardized scale to assess a patient's functional capacity.

Oncology

Internal Medicine

Open Tool

Karnofsky Performance Status (KPS)

Quantifies functional impairment in patients (often oncology).

Oncology

Internal Medicine

Open Tool

Pediatric ETT Size & Depth

Estimates endotracheal tube (ETT) size and insertion depth by age.

Pediatrics

Emergency

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Total Blood Volume (Nadler's Equation)

Estimates total blood volume based on height, weight, and sex.

General

Surgery

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GRACE ACS Risk Score

Estimates 6-month mortality in patients with Acute Coronary Syndrome.

Alveolar Gas Equation (PAO₂)

Calculates the ideal partial pressure of oxygen in the alveoli.

Pulmonology

Critical Care

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FOUR Score

Coma scale superior to GCS for intubated patients.

Neurology

Critical Care

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Revised Trauma Score (RTS)

Predicts survival probability in trauma patients.

Emergency

Surgery

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National Early Warning Score (NEWS2)

Identifies acutely ill patients, including those with sepsis.

Internal Medicine

Emergency

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Urine Anion Gap

Evaluates the cause of a Normal Anion Gap Metabolic Acidosis (NAGMA).

Nephrology

Laboratory

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Calcium-Phosphate Product

Assesses the risk of metastatic calcification in renal failure.

Nephrology

Laboratory

Open Tool

PECARN Pediatric Head Injury Rule

Decides if CT head is needed after pediatric trauma.

Pediatrics

Emergency

Open Tool

Basal Metabolic Rate (BMR)

Estimates daily caloric needs based on the Harris-Benedict equation.

General

Endocrinology

Open Tool

Insulin Sensitivity Factor (ISF)

Calculates the expected blood glucose drop per 1 unit of insulin.

Endocrinology

Internal Medicine

Open Tool

Opioid MME Calculator

Calculates Morphine Milligram Equivalents (MME) to assess overdose risk.

Pharmacist

Internal Medicine

Open Tool

LDL Cholesterol Calculator (Friedewald)

Estimates LDL cholesterol from a standard lipid panel.

Cardiology

Laboratory

Open Tool

Non-HDL Cholesterol Calculator

Calculates all atherogenic cholesterol particles.

Cardiology

Laboratory

Open Tool

CHADS₂ Score

Estimates stroke risk in patients with atrial fibrillation.

Cardiology

Neurology

Open Tool

NIH Stroke Scale (NIHSS)

Standardized assessment of acute ischemic stroke severity.

Pneumonia Severity Index (PSI/PORT)

Estimates mortality for Community-Acquired Pneumonia (CAP).

Pulmonology

Infectious Disease

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Dialysis Adequacy (Kt/V)

Calculates single-pool Kt/V to assess hemodialysis adequacy.

Total Daily Energy Expenditure (TDEE)

Estimates total daily caloric needs based on BMR and activity level.

General

Nutrition

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Blood Glucose Unit Converter

Converts blood glucose between mg/dL and mmol/L.

Endocrinology

General

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Atherogenic Index of Plasma (AIP)

Calculates cardiovascular risk using the Triglyceride/HDL ratio.

Cardiology

Laboratory

Open Tool

ASCVD Risk Estimator (10-Year)

Calculates the 10-year risk of heart disease and stroke.

Cardiology

Internal Medicine

Open Tool

HAS-BLED Score for Major Bleeding Risk

Estimates 1-year risk of major bleeding in patients with AFib.

Cardiology

Hematology

Open Tool

Simplified PESI (sPESI)

Identifies low-risk pulmonary embolism patients for outpatient care.

Pulmonology

Cardiology

Open Tool

Fractional Excretion of Urea (FEUrea)

Differentiates prerenal vs intrinsic acute kidney injury.

Nephrology

Laboratory

Open Tool

DKA Severity Calculator

Stratifies Diabetic Ketoacidosis (DKA) into mild, moderate, or severe.

Endocrinology

Emergency

Open Tool

Predicted Body Weight (ARDSNet)

Calculates Predicted Body Weight for lung-protective ventilation.

Pulmonology

Critical Care

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Carbohydrate-to-Insulin Ratio

Calculates the grams of carbohydrates covered by 1 unit of insulin.

Endocrinology

Nutrition

Open Tool

Infusion Rate Calculator

Calculates the IV pump flow rate (mL/hr).

Pharmacist

Emergency

Open Tool

Pulse Pressure

Calculates the difference between systolic and diastolic blood pressure.

Cardiology

Internal Medicine

Open Tool

Temperature Converter

Converts body temperature between Celsius and Fahrenheit.

General

Emergency

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IV Drip Rate (Drops/min)

Calculates the manual gravity IV infusion rate in drops per minute.

Pharmacist

Emergency

Open Tool

Gestational Age & Pregnancy Milestones

Calculates pregnancy trimester, days to delivery, and clinical milestones.

Obstetrics

General

Open Tool

Weight Converter (kg ↔ lbs)

Converts weight between kilograms and pounds.

General

Pharmacist

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Height Converter (cm ↔ inches)

Converts height between centimeters and inches/feet.

General

Nursing

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Systemic Vascular Resistance (SVR)

Calculates left ventricular afterload / vascular resistance.

Cardiology

Critical Care

Open Tool

KDIGO AKI Staging Criteria

Stages Acute Kidney Injury (AKI) based on serum creatinine changes.

Nephrology

Critical Care

Open Tool

Bicarbonate Deficit Calculator

Calculates the quantity of sodium bicarbonate needed to correct metabolic acidosis.

Nephrology

Critical Care

Open Tool

Reticulocyte Production Index (RPI)

Assesses bone marrow response in anemia.

Hematology

Laboratory

Open Tool

Ganzoni Equation (Iron Deficit)

Calculates the total IV iron dose needed for iron deficiency anemia.

Hematology

Pharmacist

Open Tool

Corrected Age (Premature Infant)

Calculates adjusted developmental age for premature infants.

Pediatrics

General

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Braden Scale (Pressure Ulcer Risk)

Evaluates inpatient risk for developing pressure ulcers.

Geriatrics

Nursing

Open Tool

Corticosteroid Dose Converter

Converts equivalent anti-inflammatory doses across systemic corticosteroids.

Pharmacist

Endocrinology

Open Tool

Delta-Delta Ratio (Delta Gap)

Evaluates mixed acid-base disorders in high anion gap metabolic acidosis.

Canadian CT Head Rule (CCHR)

Determines the need for head CT in minor adult head trauma.

Emergency

Neurology

Open Tool

Cardiac Output (Fick Principle)

Calculates cardiac output from oxygen consumption and arteriovenous O2 difference.

Estimated Plasma Volume Status (ePVS)

Quantifies intravascular plasma volume and congestion in heart failure.

Cardiology

Nephrology

Open Tool

Pediatric Weight-Based Dosing

Calculates pediatric single/daily doses and liquid suspension volumes (mL).

Pediatrics

Pharmacist

Open Tool

Framingham 10-Year Cardiovascular Risk Score

Estimates 10-year risk of developing coronary heart disease and stroke.

Cardiology

Primary Care

Open Tool

Estimated Urine Osmolality

Estimates urine osmolality from urinalysis specific gravity.

Nephrology

Laboratory

Open Tool

Pulmonary Embolism Severity Index (PESI)

Stratifies 30-day mortality risk in acute pulmonary embolism.

Pulmonology

Emergency

Open Tool

Cockcroft-Gault Creatinine Clearance

Estimates creatinine clearance (CrCl) for renal drug dosing adjustments.

Nephrology

Pharmacist

Open Tool

Cardiac Index (CI)

Normalizes cardiac output to body surface area.

Cardiology

Critical Care

Open Tool

Reynolds Risk Score (with hs-CRP)

Estimates 10-year cardiovascular risk incorporating high-sensitivity CRP and family history.

Cardiology

Primary Care

Open Tool

Barthel Index (Activities of Daily Living)

Measures functional independence and disability in activities of daily living.

Geriatrics

Neurology

Open Tool

Morse Fall Scale (MFS)

Predicts inpatient fall risk and guides nursing fall precautions.

Nursing

Geriatrics

Open Tool

Timed Up and Go (TUG) Test

Assesses mobility, balance, and fall risk in older adults.

Physiotherapy

Geriatrics

Open Tool

6-Minute Walk Test (Predicted 6MWD)

Calculates predicted 6-minute walk distance (6MWD) and % predicted.

Pulmonology

Cardiology

Open Tool

New Ballard Score (Gestational Age)

Estimates gestational age of newborns via physical and neuromuscular exam.

Pediatrics

Obstetrics

Open Tool

Oswestry Disability Index (ODI)

Measures low back pain functional disability and treatment outcomes.

Orthopedics

Physiotherapy

Open Tool

Harris-Benedict BMR & Caloric Needs

Calculates Basal Energy Expenditure (BEE) and daily caloric requirements.

Endocrinology

Primary Care

Open Tool

Ranson's Criteria (Acute Pancreatitis)

Predicts severity and mortality in acute pancreatitis at admission and 48 hours.

Gastroenterology

Emergency

Open Tool

Caprini Score (Surgical VTE Risk)

Stratifies surgical patients for DVT/PE risk and guides anticoagulation prophylaxis.

Surgery

Hematology

Open Tool

Berg Balance Scale (BBS)

Measures balance and fall risk in older adults and stroke rehabilitation.

Physiotherapy

Geriatrics

Open Tool

Neck Disability Index (NDI)

Measures patient-reported disability and functional limitation from neck pain.

Orthopedics

Physiotherapy

Open Tool

DASH Score (Disabilities of Arm, Shoulder & Hand)

Measures upper extremity musculoskeletal disability and functional impairment.

Orthopedics

Physiotherapy

Open Tool

Lower Extremity Functional Scale (LEFS)

Evaluates functional impairment in patients with lower limb musculoskeletal conditions.

Orthopedics

Physiotherapy

Open Tool

Waterlow Scale (Pressure Ulcer Risk)

Evaluates pressure ulcer (bedsore) risk in acute and elderly care settings.

Nursing

Geriatrics

Open Tool

Broselow Pediatric Emergency Resuscitation Tape

Estimates pediatric weight, equipment sizes, and drug doses from child length.

Pediatrics

Emergency

Open Tool

Clinical Pulmonary Infection Score (CPIS for VAP)

Assesses probability of ventilator-associated pneumonia (VAP) in ICU patients.

Critical Care

Infectious Disease

Open Tool

Albumin-to-Globulin (A/G) Ratio

Calculates calculated globulin and A/G ratio for liver, renal, and myeloma workups.

General

Gastroenterology

Open Tool

APACHE II Score (ICU Mortality)

Estimates ICU illness severity and in-hospital mortality risk.

WOMAC Osteoarthritis Index

Measures pain, stiffness, and physical disability in hip and knee osteoarthritis.

Orthopedics

Rheumatology

Open Tool

FRAX® 10-Year Osteoporotic Fracture Risk Tool

Estimates 10-year probability of major osteoporotic and hip fractures.

Endocrinology

Rheumatology

Open Tool

VBAC / TOLAC Success Predictor (MFMU)

Predicts probability of successful vaginal birth after cesarean section.

Obstetrics

Gynecology

Open Tool

Local Anesthetic Maximum Dose & Toxicity Calculator

Calculates maximum safe mg, volume (mL), and dental cartridges for local anesthetics.

Anesthesiology

Dentistry

Open Tool

Vancomycin Pharmacokinetic Dosing & AUC/MIC Calculator

Calculates loading dose, maintenance regimen, and AUC24/MIC target for vancomycin.

VO₂ Max Estimator (Rockport 1-Mile Walk Test)

Estimates maximal oxygen consumption (cardiorespiratory fitness) from a 1-mile walk.

Cardiology

Physiotherapy

Open Tool

One-Repetition Maximum (1RM) Strength Calculator

Estimates 1RM maximum strength and percentage training loads from submaximal reps.

Physiotherapy

Sports Medicine

Open Tool

Gait Speed Test (10-Meter Walk Test / 10MWT)

Measures walking speed (the "6th vital sign") to assess mobility, fall risk, and frailty.

Physiotherapy

Geriatrics

Open Tool

ASA Physical Status Classification

Stratifies preoperative systemic health status and perioperative mortality risk.

Anesthesiology

Surgery

Open Tool

ARDSnet Mechanical Ventilation Protocol & Tidal Volume Calculator

Calculates lung-protective tidal volumes (4-8 mL/kg PBW), driving pressure, and PEEP/FiO2 tables.

Critical Care

Pulmonology

Open Tool

Neonatal Bilirubin Risk & Phototherapy Thresholds (AAP 2022 / Bhutani)

Evaluates newborn jaundice, Bhutani risk zone, phototherapy, and exchange transfusion thresholds.

Pediatrics

Neonatology

Open Tool

Hadlock Estimated Fetal Weight (EFW Sonographic Biometry)

Calculates Estimated Fetal Weight in grams and lbs from 4-parameter ultrasound biometry (BPD, HC, AC, FL).

Obstetrics

Radiology

Open Tool

MASCC Risk Index for Febrile Neutropenia

Stratifies cancer patients with febrile neutropenia into low- vs high-risk for severe complications.

Oncology

Hematology

Open Tool

Revised Cardiac Risk Index (Lee’s RCRI for Perioperative Risk)

Predicts perioperative cardiac complications and mortality in non-cardiac surgery.

Cardiology

Surgery

Open Tool

fullPIERS Model for Adverse Preeclampsia Outcomes

Predicts risk of severe adverse maternal outcomes within 48 hours in preeclampsia.

Hyperosmolar Hyperglycemic State (HHS) & Osmolality Evaluator

Calculates effective osmolality, corrected sodium, free water deficit, and HHS vs DKA diagnostic criteria.

Endocrinology

Emergency

Open Tool

DMFT / DMFS Dental Caries Index (WHO)

Quantifies cumulative dental caries burden (Decayed, Missing, and Filled Teeth) and severity.

Dentistry

General

Open Tool

Functional Independence Measure (FIM™ Instrument)

Evaluates motor and cognitive functional disability burden in medical rehabilitation (18-126 points).

Physiotherapy

Neurology

Open Tool

Pediatric Blood Pressure Percentile Calculator (AAP 2017)

Classifies pediatric blood pressure into Normal, Elevated, Stage 1, or Stage 2 HTN by age, sex, and height.

Pediatrics

Cardiology

Open Tool

APACHE IV Score for ICU Mortality & Length of Stay

Calculates APACHE IV acute physiology score, in-hospital mortality, and predicted ICU length of stay.

Pediatric BMI Percentile & Z-Score (CDC Growth Charts)

Calculates child/adolescent BMI, CDC percentile, Z-score, and pediatric obesity classification.

Pediatrics

Endocrinology

Open Tool

Cobb Angle Scoliosis Severity & Progression Calculator

Evaluates coronal spinal curvature, progression risk, and bracing/surgical thresholds for scoliosis.

Orthopedics

Radiology

Open Tool

Warfarin Dosing & CHEST INR Reversal Protocol

Calculates weekly warfarin dose adjustments and evidence-based INR reversal protocols (Vitamin K / 4F-PCC).

Pharmacology

Hematology

Open Tool

Weight-Based Heparin Infusion & Titration Protocol

Calculates initial weight-based IV heparin bolus, infusion rate, and dynamic aPTT / Anti-Xa titration nomograms.

Pharmacology

Cardiology

Open Tool

Extended-Interval Aminoglycoside Dosing (Hartford Nomogram)

Calculates once-daily Gentamicin, Tobramycin (7 mg/kg), and Amikacin dosing and interval selection.

Pharmacology

Infectious Disease

Open Tool

Pediatric Dental Local Anesthetic Maximum Dose Calculator (AAPD)

Calculates weight-based maximum safe pediatric doses and dental carpule limits (AAPD Guidelines).

Dentistry

Pediatrics

Open Tool

Periodontal Risk Assessment (PRA Hexagonal Model)

Evaluates patient multi-factorial periodontal disease recurrence risk and recall intervals (Lang & Tonetti).

Dentistry

General

Open Tool

Gingival Index (GI) & Plaque Index (PI) of Löe & Silness

Quantifies clinical gingival inflammation severity and cervical biofilm accumulation.

Dentistry

General

Open Tool

Dietary Fluoride Supplementation Dosing (ADA / AAP / AAPD)

Calculates daily dietary systemic fluoride dosing and topical toothpaste guidelines by age and water fluoride level.

Dentistry

Pediatrics

Open Tool

Risser Classification & Skeletal Maturity for Scoliosis

Evaluates iliac apophysis ossification stages (0 to 5), remaining spinal growth, and scoliosis progression risk.

Orthopedics

Radiology

Open Tool

Postpartum Hemorrhage (PPH) Risk Assessment (ACOG / CMQCC)

Stratifies obstetric postpartum hemorrhage risk into Low, Medium, or High risk to guide blood banking and uterotonics.

Obstetrics

Gynecology

Open Tool

Gestational Diabetes Mellitus (GDM) Diagnostic Evaluator

Evaluates OGTT results via ACOG 2-Step (Carpenter-Coustan) and ADA/IADPSG 1-Step criteria.

Obstetrics

Endocrinology

Open Tool

Maximum Allowable Blood Loss (MABL & Surgical Hemorrhage)

Calculates patient estimated blood volume (EBV) and maximum permissible blood loss before transfusion trigger.

Surgery

Anesthesiology

Open Tool

Target Heart Rate & Training Zones (Karvonen HRR Formula)

Calculates heart rate reserve (HRR) and 5 clinical exercise training zones (Fat Burn, Aerobic, Anaerobic).

Physiotherapy

Cardiology

Open Tool

METs & Caloric Energy Expenditure Calculator

Calculates Metabolic Equivalents (METs), total calories burned (kcal), and oxygen consumption (VO₂).

Physiotherapy

Nutrition

Open Tool

30-Second Chair Stand Test (CDC STEADI Fall Risk)

Evaluates lower body functional strength, frailty, and fall risk in older adults (CDC STEADI).

Physiotherapy

Geriatrics

Open Tool

Pain Disability Index (PDI for Chronic Pain)

Measures the impact of chronic pain on 7 essential daily life activities and functional disability (0-70).

Physiotherapy

Neurology

Open Tool

Range of Motion (ROM) Deficit & Joint Impairment Calculator (AMA Guides)

Calculates active joint range-of-motion deficits and percentage impairment against AMA reference standards.

Physiotherapy

Orthopedics

Open Tool

24-Hour Cumulative Fluid Balance & Fluid Overload Index

Calculates 24-hour net fluid balance (Intake vs Output) and percentage fluid overload (% FO).

Critical Care

Nursing

Open Tool

Caries Risk Assessment (CAMBRA / ADA Guidelines)

Evaluates dental caries risk (Low, Moderate, High, Extreme) to guide recall, fluoride varnish, and prescription pastes.

Dentistry

Pediatrics

Open Tool

Dental Implant Bone Quality & Success Predictor (Misch Classification)

Evaluates bone density (D1–D4), primary stability, healing time, and osseointegration failure risk.

Dentistry

Surgery

Open Tool

Gestational Weight Gain Calculator (IOM / ACOG Guidelines)

Calculates recommended pregnancy weight gain trajectory based on pre-pregnancy BMI and gestational age.

Obstetrics

Nutrition

Open Tool

Pediatric Bone Age & Predicted Adult Height (Greulich-Pyle / Bayley-Pinneau)

Evaluates skeletal maturity discrepancy (delayed vs advanced) and calculates mid-parental adult target height.

Pediatrics

Endocrinology

Open Tool

Limb Length Discrepancy & Epiphysiodesis Timing (Menelaus / Green-Anderson)

Calculates predicted leg length discrepancy at skeletal maturity and timing for surgical epiphysiodesis.

Orthopedics

Pediatrics

Open Tool

CRRT Effluent Dose & KDIGO Target Calculator (CVVH / CVVHD / CVVHDF)

Calculates continuous renal replacement therapy effluent dose (mL/kg/hr) and pre-dilution correction.

Nephrology

Critical Care

Open Tool

Furosemide Stress Test (FST for AKI Progression)

Evaluates 2-hour urinary response to loop diuretic challenge to predict progression to severe Stage 3 AKI and RRT.

Nephrology

Critical Care

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Revised Trauma Score (RTS & T-RTS Survival Probability)

Calculates Triage RTS (0–12) and weighted physiological RTS (0–7.84) to determine trauma center destination and survival probability.

Emergency

Surgery

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Packed Red Blood Cell (PRBC) Transfusion Volume & Unit Calculator

Calculates PRBC volume (mL) for pediatrics and unit counts for adults to achieve target hemoglobin (AABB guidelines).

Hematology

Pediatrics

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Clinical Pharmacokinetics Loading Dose & Maintenance Infusion Calculator

Calculates Loading Dose (LD), Maintenance Dose (MD), continuous infusion rate, and steady-state kinetics.

Pharmacology

Critical Care

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Drug Elimination Half-Life & Steady-State Accumulation Calculator

Calculates elimination rate constant (ke), washout elimination percentage, time to steady state, and accumulation index.

Pharmacology

General

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Anticholinergic Cognitive Burden (ACB) & AGS Beers Criteria® Risk

Calculates cumulative anticholinergic burden (ACB 0–9+) and flags high-risk potentially inappropriate medications in older adults.

Pharmacology

General

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Waterlow Pressure Ulcer Risk Assessment Scale

Evaluates pressure injury risk across 10 clinical domains (10+ At Risk, 15+ High Risk, 20+ Very High Risk).

Nursing

Geriatrics

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HIV Post-Exposure Prophylaxis (PEP) Risk & Regimen Calculator (CDC)

Evaluates per-act HIV transmission risk, PEP eligibility (< 72 hours), and 28-day 3-drug antiretroviral regimens.

Infectious Disease

Emergency

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Clinical Protein Target & Nitrogen Balance Calculator (ASPEN / ESPEN)

Calculates daily protein requirements (g/day) across clinical conditions and evaluates 24-hour nitrogen balance.

Nutrition

Critical Care

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Macronutrient Partitioning & Energy Distribution Calculator

Partitions total daily calories into grams and percentages of Protein, Carbohydrates, and Fats by clinical diet goal.

Nutrition

Endocrinology

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Child-Turcotte-Pugh (CTP) Cirrhosis Classification & Surgical Risk

Calculates Child-Pugh Score (Class A/B/C, 5–15 pts) for hepatic cirrhosis prognosis and perioperative mortality.

Gastroenterology

Surgery

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Maddrey's Discriminant Function & Lille Model (Alcoholic Hepatitis)

Calculates Maddrey Discriminant Function (mDF ≥ 32) to determine steroid eligibility in severe alcohol-associated hepatitis.

Gastroenterology

Critical Care

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DAPT Score (Dual Antiplatelet Therapy Duration Post-PCI)

Calculates DAPT Score (-2 to +10) to determine if prolonged antiplatelet therapy beyond 12 months is beneficial.

Cardiology

Pharmacology

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Padua Prediction Score for Medical Inpatient VTE Prophylaxis (CHEST Guidelines)

Calculates Padua VTE Score (0–20) to identify hospitalized medical patients needing pharmacologic thromboprophylaxis (Score ≥ 4).

Hematology

Internal Medicine

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Chemotherapy Dosing & Calvert Carboplatin AUC Calculator

Calculates Carboplatin Calvert AUC dose (with FDA GFR cap) and Mosteller BSA-based cytotoxic chemotherapy dosing.

Oncology

Pharmacology

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Albumin-Corrected Calcium Calculator (Payne Formula)

Calculates corrected total serum calcium (mg/dL & mmol/L) for hypoalbuminemia and stratifies hypercalcemic crisis risk.

Endocrinology

Nephrology

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Time in Therapeutic Range (TTR) & SAMe-TT₂R₂ Warfarin vs DOAC Score

Evaluates INR anticoagulation quality (Rosendaal TTR target ≥ 70%) and SAMe-TT₂R₂ score to guide DOAC transition.

Hematology

Cardiology

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Chemotherapy ANC Nadir & Febrile Neutropenia Risk Calculator

Calculates Absolute Neutrophil Count (ANC), CTCAE neutropenia grade, expected nadir timeline, and febrile neutropenia protocols.

Oncology

Hematology

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Mifflin-St Jeor & Katch-McArdle BMR / TDEE Calculator

Calculates Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) with Mifflin-St Jeor and Katch-McArdle equations.

Nutrition

Endocrinology

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Thyroid Ultrasound Volume & Goiter Staging Calculator

Calculates bilateral thyroid lobe volumes (mL/cm³) using the Brunn ellipsoid formula and stages goiter severity.

Endocrinology

General

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Barthel Index for Activities of Daily Living (ADL Assessment)

Calculates the 100-point Barthel Index to assess functional independence and nursing care requirements.

Physical Therapy

Geriatrics

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Simplified Oral Hygiene Index (OHI-S - Greene & Vermillion)

Calculates Debris Index (DI-S), Calculus Index (CI-S), and total OHI-S (0–6) to quantify oral cleanliness.

Dentistry

General

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Oral Cancer Risk Stratification & Biopsy Urgency Index

Stratifies oral lesion malignancy risk (0–18 pts) to guide immediate incisional biopsy vs 14-day observation.

Dentistry

Oncology

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Pediatric Maintenance Fluids (Holliday-Segar) & Dehydration Deficit

Calculates 24-hour and hourly maintenance fluids (4-2-1 rule), dehydration fluid deficit, and emergent bolus volume.

Pediatrics

Critical Care

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Oxygen Content (CaO₂) & Oxygen Delivery (DO₂ / DO₂I) Calculator

Calculates arterial oxygen content (CaO₂), global oxygen delivery (DO₂), and indexed DO₂I to detect tissue dysoxia.

Critical Care

Pulmonology

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Gravity IV Drip Rate & Flow Time Calculator (Macrodrip & Microdrip)

Calculates gravity intravenous drip rate (gtt/min), flow rate (mL/hr), and drops per 15 seconds.

Nursing

Pharmacology

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Inpatient Basal-Bolus & Correction Insulin Sliding Scale Calculator

Calculates Total Daily Dose (TDD), 50/50 Basal-Prandial split, and personalized correction insulin sliding scale doses.

Endocrinology

Pharmacology

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Richmond Agitation-Sedation Scale (RASS) & ICU Sedation Protocol

Evaluates RASS (-5 to +4) to titrate sedative infusions, prevent delirium, and guide Spontaneous Awakening Trials (SAT).

Critical Care

Anesthesiology

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Dental Procedural Bleeding Risk & Antithrombotic Management

Guides perioperative management of Warfarin, DOACs, and Antiplatelets for dental extractions & oral surgery.

Dentistry

Hematology

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Modified Early Warning Score (MEWS for Clinical Deterioration)

Calculates MEWS (0–14) from bedside vital signs to trigger Rapid Response Team (RRT) activation.

Critical Care

Hospital Medicine

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Ottawa Knee Rule for Acute Knee Injury Radiography

Evaluates 5 clinical criteria to determine if knee X-rays are indicated after acute knee trauma (100% sensitivity).

Emergency Medicine

Orthopedics

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McIsaac Modified Centor Score for Strep Pharyngitis

Calculates McIsaac score (-1 to 5) to stratify Group A Strep probability and direct Rapid Strep Testing (RADT) vs antibiotics.

Infectious Disease

Emergency Medicine

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Alvarado Score (MANTRELS) for Acute Appendicitis

Calculates Alvarado score (0–10) from symptoms, signs, and labs to guide CT imaging and urgent appendectomy.

Emergency Medicine

Surgery

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APGAR Neonatal Assessment Score (1, 5, & 10 Minutes)

Evaluates newborn 10-point APGAR score to assess extrauterine transition and guide NRP resuscitation.

Pediatrics

Obstetrics

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CRB-65 Severity Score for Community-Acquired Pneumonia

Evaluates CRB-65 score (0–4) without blood urea to determine home treatment vs urgent hospital admission.

Pulmonology

Infectious Disease

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Caprini Score for Venous Thromboembolism (VTE) Surgical Prophylaxis

Calculates the comprehensive Caprini VTE score to guide perioperative mechanical and pharmacologic thromboprophylaxis.

Hematology

Surgery

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Adult Daily Maintenance Fluid & Electrolyte Requirement Calculator

Calculates 24-hour maintenance water, sodium, potassium, and hourly IV infusion rate based on NICE guidelines.

Hospital Medicine

General

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Lund-Browder Pediatric & Adult Burn Surface Area Chart

Calculates age-adjusted %TBSA for 2nd/3rd degree burns and determines ABA Parkland resuscitation fluids.

Emergency Medicine

Pediatrics

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ORBIT Bleeding Risk Score for Anticoagulation in Atrial Fibrillation

Calculates the 5-item ORBIT bleeding score to stratify major hemorrhage risk on DOACs or Warfarin.

Cardiology

Hematology

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Blood Component Transfusion Volume & Post-Transfusion Increment Calculator

Calculates required volume and expected laboratory rise for PRBCs, Platelets, FFP, and Cryoprecipitate.

Hematology

Critical Care

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Corrected Sodium in Hyperglycemia (Katz & Hillier Equations)

Calculates true physiological serum sodium in DKA and HHS, correcting for osmotic pseudohyponatremia.

Endocrinology

Nephrology

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Revised Trauma Score (RTS) & TRISS Predicted Survival Probability

Calculates physiological RTS (0–12) and TRISS predicted survival probability in severe trauma.

Emergency Medicine

Surgery

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WHO / CDC Pediatric Growth Percentiles & Z-Score Calculator

Calculates Weight-for-Age, Height-for-Age, and BMI Z-scores and percentiles for infants and children.

Pediatrics

General

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Pediatric Medication Dosing Rules (Weight-Based, Clark's & Young's)

Calculates pediatric mg/kg/dose, liquid volume (mL), and classical Clark's/Young's rule comparisons.

Pediatrics

Pharmacology

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Total Body Drug Clearance (CL = Dose / AUC = Ke × Vd) Calculator

Calculates systemic drug clearance (L/hr & mL/min), renal vs hepatic elimination, and steady-state maintenance rate.

Pharmacology

Laboratory

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Apparent Volume of Distribution (Vd = Dose / C0) & Loading Dose Calculator

Calculates apparent volume of distribution (L & L/kg), tissue distribution, and target loading dose.

Pharmacology

Critical Care

Open Tool

Maximum Safe Drug Dose & Acute Toxicity Threshold Calculator

Calculates 24-hour ceiling doses and acute overdose toxicity thresholds for high-risk medications.

Pharmacology

Emergency Medicine

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Pediatric Respiratory Distress & Bronchiolitis Severity Score (RSS)

Evaluates pediatric respiratory distress score (0–12) for viral bronchiolitis, croup, and asthma.

Pediatrics

Pulmonology

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Warfarin Supratherapeutic INR & Reversal Nomogram (CHEST Guidelines)

Provides guideline-directed 4F-PCC, Vitamin K, and dose-hold recommendations for elevated INR and bleeding.

Hematology

Pharmacology

Open Tool

Y-Site IV Drug Compatibility & Co-Infusion Precipitation Checker

Checks physical/chemical compatibility of concurrent IV medications co-infused via single lumen Y-site.

Pharmacology

Nursing

Open Tool

Multi-Interval Weight-Based Medication Regimen & Dosing Planner

Calculates weight-based single dose, 24-hour total, and full-course prescription requirements.

Pharmacology

General

Open Tool

IV Infusion Rate & Gravity Drip Drop Factor (gtt/min) Calculator

Calculates electronic infusion pump rate (mL/hr) and gravity drip rate (drops/min or gtt/min).

Nursing

Hospital Medicine

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Physiological Dead Space Fraction (VD/VT - Bohr-Enghoff Equation)

Calculates physiological dead space ratio (VD/VT) and PaCO2-PetCO2 gradient in mechanical ventilation and ARDS.

Dynamic Compliance (Cdyn), Static Compliance (Cstat) & Airway Resistance (Raw) Calculator

Calculates Cdyn, Cstat, and Raw to differentiate resistive vs elastic respiratory mechanics in mechanical ventilation.

Critical Care

Pulmonology

Open Tool

Diltiazem (Cardizem) IV Bolus, Infusion Rate & Oral Transition Calculator

Calculates weight-based IV boluses (0.25 & 0.35 mg/kg), infusion rate (5–15 mg/hr), and oral transition dosing for AFib RVR.

Cardiology

Pharmacology

Open Tool

Insulin Sensitivity Factor (ISF / 1800 Rule) & Carb-to-Insulin Ratio (CIR)

Calculates ISF correction factor, CIR carbohydrate ratio, and combined mealtime bolus dosing.

Endocrinology

Pharmacology

Open Tool

Pediatric Endotracheal (ET) Tube Size, Depth & Equipment Selection (PALS Guidelines)

Calculates age/weight-based cuffed and uncuffed ETT size, lip-to-tip depth, and laryngoscope blade size.

Pediatrics

Anesthesiology

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AAP Pediatric Blood Pressure Percentiles & Hypertension Staging

Calculates age, sex, and height-adjusted blood pressure percentiles and AAP hypertension staging.

Pediatrics

Cardiology

Open Tool

Pediatric DKA 48-Hour Fluid Deficit & Two-Bag Resuscitation Protocol (ISPAD / PECARN)

Calculates ISPAD 48-hour fluid replacement, maintenance rate, potassium repletion, and cerebral edema precautions.

Pediatric Status Epilepticus Emergency Medication Dosing Protocol (AES / ESETT)

Calculates weight-based 1st-line Benzodiazepines and 2nd-line ESETT Anticonvulsants for pediatric seizures.

Pediatrics

Neurology

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4Ts Clinical Probability Score for Heparin-Induced Thrombocytopenia (HIT)

Calculates the 4Ts score (0–8) to evaluate pre-test probability of HIT and guide immediate non-heparin anticoagulation.

Hematology

Critical Care

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Magnesium Sulfate Obstetric Dosing & Toxicity Protocol (ACOG Preeclampsia / Eclampsia)

Calculates loading/maintenance dosing, fetal neuroprotection rates, and Calcium Gluconate antidote protocols.

Obstetrics

Pharmacology

Open Tool

Oxytocin (Pitocin) Labor Induction, Augmentation & Postpartum Hemorrhage Calculator

Calculates low-dose/high-dose induction rates (mU/min to mL/hr) and PPH uterotonic protocols.

Obstetrics

Pharmacology

Open Tool

Anti-D Immune Globulin (RhoGAM) Dosing & Kleihauer-Betke FMH Calculator

Calculates fetal-maternal hemorrhage (FMH) volume and ACOG-recommended 300 mcg RhoGAM vials.

Obstetrics

Hematology

Open Tool

Universal Medical Unit Converter (Labs, Pressure, Molar, IU)

Converts clinical lab values (Creatinine, Hb, Lipids), physical pressures, volumes, and molar masses (mg ↔ mmol ↔ mEq).

General

Laboratory

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CDC Pediatric Immunization Schedule (0–18 Years)

Determines standard CDC-recommended routine childhood vaccines based on patient age in months.

Pediatrics

Primary Care

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