Health Calculators
Explore general health, nutrition and activity estimates with important limitations explained.
← Browse all calculators16 calculators in this category
Estimate basal metabolic rate and daily calorie needs from body measurements and activity.
Open calculator → Health Body Fat CalculatorEstimate body fat percentage with the circumference-based US Navy method.
Open calculator → Health Macro CalculatorSplit a daily calorie target into protein, carbohydrate and fat grams.
Open calculator → Health Pregnancy Due Date CalculatorEstimate a due date from the first day of the last menstrual period and cycle length.
Open calculator → Health BMI Calculator (Metric)Estimate body mass index from kilograms and centimetres.
Open calculator → Health BMI Calculator (Imperial)Estimate body mass index from pounds and inches.
Open calculator → Health BMR CalculatorEstimate basal metabolic rate using the Mifflin-St Jeor equation.
Open calculator → Health Daily Calorie Needs CalculatorEstimate daily calories from BMR and activity level.
Open calculator → Health Daily Water Intake CalculatorEstimate a simple daily water target based on body weight.
Open calculator → Health Running Pace CalculatorCalculate pace from distance and finishing time.
Open calculator → Health Cycling Speed CalculatorCalculate average cycling speed.
Open calculator → Health Walking Calories EstimateEstimate calories burned while walking using a MET value.
Open calculator → Health Body Surface Area CalculatorEstimate body surface area using the Mosteller formula.
Open calculator → Health Ideal Weight Range CalculatorEstimate the weight range corresponding to BMI 18.5–24.9.
Open calculator → Health Waist-to-Height RatioCalculate waist circumference as a proportion of height.
Open calculator → Health Protein Intake CalculatorEstimate a daily protein range from body weight.
Open calculator →How to use these health calculators
These tools are useful for understanding a general health or activity estimate from the measurements you provide. Choose the calculator that most closely matches your question, check every unit and read the explanation beneath its result.
Get a more useful estimate
Use recent, accurately measured inputs and treat the output as one indicator rather than a diagnosis. Change one input at a time when comparing scenarios so you can see what caused the difference.