Health & Fitness Calculators
Choose a tool. Enter your values. Understand your result.
BMI Calculator →
Calculate adult body mass index from weight in kilograms and height in centimetres.
Pace Calculator →
Calculate running pace in minutes per kilometre and average speed from distance and duration.
Daily Water Tracker →
Track consumed water against a goal you choose and calculate the remaining amount.
BMR Calculator →
Estimate resting energy expenditure using Mifflin–St Jeor.
Calorie Calculator →
Estimate daily energy expenditure from resting energy and a chosen activity multiplier.
TDEE Calculator →
Estimate daily energy expenditure from resting energy and a chosen activity multiplier.
Macro Calculator →
Convert a calorie allocation into carbohydrate, protein and fat grams.
Carbohydrate Calculator →
Convert your chosen calorie share into grams.
Protein Calculator →
Convert your chosen calorie share into grams.
Fat Intake Calculator →
Convert your chosen calorie share into grams.
Body Fat Calculator →
Calculate body-fat percentage from fat mass measured elsewhere.
Lean Body Mass Calculator →
Calculate fat-free mass from body mass and a measured body-fat percentage.
Ideal Weight Calculator →
Show the weight range corresponding to the standard adult BMI reference interval.
Healthy Weight Calculator →
Calculate the standard adult BMI reference weight interval.
Overweight Calculator →
Calculate adult BMI as a screening measure, without diagnosing health.
Army Body Composition Calculator →
Calculate waist-to-height ratio used in the newer Army assessment approach.
Calories Burned Calculator →
Estimate energy use from an activity MET value you supply.
One Rep Max Calculator →
Estimate a one-repetition maximum using the Epley model.
Target Heart Rate Calculator →
Calculate an intensity target from a measured maximum and resting heart rate.
Body Surface Area Calculator →
Estimate body surface area using the Mosteller equation.
GFR Calculator →
Estimate adult eGFR using the 2021 race-free CKD-EPI creatinine equation.
Pregnancy Calculator →
Estimate gestational age and a due date from a last menstrual period.
Due Date Calculator →
Estimate an expected due date from the first day of the last period.
Pregnancy Conception Calculator →
Estimate a conception date from a due date supplied by your clinician.
Conception Calculator →
Estimate a conception date from an entered due date.
Period Calculator →
Estimate the next period and ovulation from a typical cycle length.
Ovulation Calculator →
Estimate the next period and ovulation from a typical cycle length.
Pregnancy Weight Gain Calculator →
Track change from pre-pregnancy weight and display the general singleton reference range.
Body Measurements Calculator →
Compare waist, hip and shoulder measurements with simple ratios.
BAC Calculator →
Illustrate a simplified Widmark blood-alcohol estimate using parameters you supply.
Nutrition Energy Calculator →
Calculate food energy from grams of carbohydrate, protein and fat.
Understand the measurement before using the result
Adult BMI relates weight to height. BMR estimates resting energy, while TDEE multiplies a resting estimate by the activity multiplier you choose. Running pace relates distance to elapsed time. Select the tool that answers your particular measurement question.
Read the units and equation carefully. Clinical formulas and date-based estimates have specific limits; they do not provide a diagnosis, prescribe treatment or guarantee an outcome. Sources are linked on pages that use referenced methods.
A little help with the numbers
Smart input · AI explanations when connected