Medicine Calculators
Last updated: September 2026
BMI Calculator
Calculate Body Mass Index (BMI) — body weight in kg divided by height in metres squared — to screen for under/overweight categories.
Body Fat Percentage Calculator
Estimate your body fat percentage from a tape measure using the US Navy circumference method — the same protocol the US military uses for fitness compliance.
Blood Pressure Risk Assessment Calculator
Assess your cardiovascular risk score based on blood pressure readings, age, smoking status, and family history of heart disease.
Daily Fluid Requirements Calculator
Estimates a patient's daily fluid needs using the Holliday-Segar method, a tiered weight-based formula.
Pediatric Fever Medication Calculator
Calculate the correct acetaminophen or ibuprofen dose for a child based on weight.
BMI & Body Fat Percentage Calculator
Calculate your BMI and estimate body fat percentage from body measurements using the U.S.
10-Year Heart Disease Risk Calculator
Estimates your 10-year risk of a cardiovascular event with the Framingham general CVD equation (D'Agostino 2008), using age, sex, blood pressure and its treatment, total and HDL cholesterol, smoking and diabetes.
Medication Dosage Calculator
Calculate a weight-based medication dose adjusted for patient age and kidney function.
Pregnancy Due Date Calculator
Estimate your due date and current pregnancy week from how many days ago your last menstrual period started, your average cycle length, and the dating method.
Waist-to-Hip Ratio Calculator
Divides your waist circumference by your hip circumference to gauge how body fat is distributed — a strong, simple predictor of cardiometabolic risk.
Daily Calorie Needs Calculator
Estimate total daily calorie needs (TDEE) by combining the revised Harris-Benedict BMR formula with an activity multiplier.
Kidney Function Calculator (eGFR)
Estimates your glomerular filtration rate (eGFR) using the race-free CKD-EPI 2021 creatinine equation from serum creatinine, age and sex.
Basal Metabolic Rate Calculator
Estimate the calories your body burns at complete rest using the Mifflin-St Jeor equation, then multiply by an activity factor to get Total Daily Energy Expenditure.
Ideal Body Weight Calculator
Estimate ideal body weight in kg from height using the Devine formula, returning a single reference weight for a given sex.
Creatinine Clearance Calculator
Estimate kidney function as creatinine clearance (CrCl) in mL/min using the Cockcroft-Gault equation.
BMI & Body Fat Calculator
Calculate your BMI from weight and height and see which WHO weight category it falls in.
Kidney Function (GFR) Calculator
Estimate your glomerular filtration rate (eGFR) with the race-free CKD-EPI 2021 creatinine equation to assess kidney function and chronic kidney disease (CKD) stage.
BSA-Based Dosage Calculator
Compute a body-surface-area-based medication dose using the DuBois BSA formula multiplied by the per-m² dose.
Mean Arterial Pressure Calculator
Compute Mean Arterial Pressure (MAP) from a standard systolic/diastolic blood-pressure reading.
Glasgow Coma Scale Calculator
Score a patient's level of consciousness using the Glasgow Coma Scale (GCS).
Anion Gap Calculator
Calculates the anion gap from serum sodium, chloride, and bicarbonate to help identify the cause of metabolic acidosis.
Corrected Calcium Calculator
Adjusts a patient's measured serum calcium for low albumin levels, revealing the true physiologically active calcium concentration.
Pack Years Calculator
Calculates cumulative smoking exposure in pack-years by multiplying daily cigarette packs by years smoked.
Micrograms to Milligrams Converter (mcg ↔ mg)
Convert between micrograms (mcg / µg) and milligrams (mg) in both directions.
mg to mL Calculator (with Concentration)
Convert a mg dose to mL (or mL back to mg) using a solution concentration.
Body Surface Area Calculator
Calculate body surface area (BSA) in m² using the Mosteller, Du Bois or Haycock formula from your weight and height.
Heart Rate Zone Calculator
Calculate your personalised heart rate training zones using the Karvonen heart rate reserve method, which factors in resting heart rate to give zones that actually reflect your cardiovascular fitness.
Mean Arterial Pressure (MAP) Calculator
Calculates your Mean Arterial Pressure (MAP) from systolic and diastolic readings.
BMI and Body Fat Calculator
Computes your BMI and estimates body fat percentage from weight, height, age, and sex.
Blood Pressure Risk Calculator
Estimates cardiovascular risk from your blood pressure readings, age, smoking status, and diabetes.
A1C Calculator
Convert HbA1c to estimated average blood glucose (eAG) or the other way, using the ADAG standard formula.