Health & fitness
BMI, calories, macros and training calculators — educational estimates.
15 tools in this category
BMI Calculator
Calculate your Body Mass Index from height and weight, with the WHO category and your healthy-weight range. An educational estimate.
Health & fitness
Calorie Calculator
Estimate your daily calories to maintain, lose or gain weight, from BMR and activity level (Mifflin–St Jeor). An educational estimate.
Health & fitness
Ideal Weight Calculator
Estimate a healthy weight for your height and sex, via the Devine, Robinson, Miller and Hamwi formulas plus the BMI range. An educational estimate.
Health & fitness
Body Fat Calculator
Estimate body fat percentage from tape measurements using the U.S. Navy method, with fat and lean mass. An educational estimate.
Health & fitness
Macronutrient Calculator
Turn a daily calorie target into grams of protein, carbs and fat for a balanced, low-carb, high-protein or keto split. An educational estimate.
Health & fitness
Target Heart Rate Calculator
Find your training heart-rate zones from age (and optional resting rate). An educational estimate, in your browser.
Health & fitness
Water Intake Calculator
Estimate how much water to drink per day from your weight and exercise, in litres and glasses. A general guideline, not medical advice.
Health & fitness
Ovulation Calculator
Estimate your fertile window and ovulation day from your last period and your own cycle length. An educational calendar estimate.
Health & fitness
Steps to Distance Calculator
Convert steps to kilometres and back, with stride length worked out from your height and whether you walk or run. Runs in your browser.
Health & fitness
Waist-to-Height Ratio Calculator
Divide your waist by your height for a quick health-risk screen and see your healthy waist range. An educational estimate, not a diagnosis.
Health & fitness
Waist-to-Hip Ratio Calculator
Divide your waist by your hips and see the sex-specific WHO health-risk band. An educational estimate, not a diagnosis.
Health & fitness
One Rep Max Calculator
Estimate your one-rep max from a weight and reps using the Epley and Brzycki formulas, with a training-percentage table. An educational estimate.
Health & fitness
Pace Calculator
Work out running pace, finish time or distance from any two of them — in minutes per km or per mile.
Health & fitness
Pregnancy Due Date Calculator
Estimate your due date from your last period or conception date, with gestational age and trimester dates. An educational estimate.
Health & fitness
Sleep Calculator
Find bedtimes or wake-up times aligned to 90-minute sleep cycles.
Health & fitness