BMR Calculator
Calculate your basal metabolic rate with Mifflin–St Jeor, Harris–Benedict or Katch–McArdle.
Health & Body Calculators
21 free tools
Calculate BMI, BMR, daily calories, body fat, ideal weight, lean body mass, body ratios and heart rate zones with free health calculators.
All 21 health & body calculators
Daily Calorie Calculator
Find how many calories you need per day to maintain, lose or gain weight.
Ideal Body Weight Calculator
Estimate your ideal weight with the Robinson, Miller, Devine and Hamwi formulas.
Body Fat Calculator
Estimate your body fat percentage with the U.S. Navy tape measure method.
Lean Body Mass Calculator
Calculate your lean body mass with the Boer, James and Hume formulas.
Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio and see your health risk level.
BMI Calculator
Calculate Body Mass Index in metric or imperial units.
Waist-to-Height Ratio Calculator
Check whether your waist is less than half your height, a simple health marker.
Body Frame Size Calculator
Find out if you have a small, medium or large body frame from your wrist size.
Body Adiposity Index Calculator
Estimate body fat from hip size and height with the body adiposity index (BAI).
Heart Rate Zone Calculator
Find your maximum heart rate and five training zones, with the Karvonen method.
Calories Burned by Distance
Estimate calories burned walking, running or cycling a distance.
Calorie Deficit Calculator
Find how many calories to eat each day to reach your goal weight by a target date.
Macro Calculator
Split your daily calories into protein, carbs and fat grams for your goal.
Due Date Calculator
Estimate your baby's due date from your last period, conception or IVF transfer date.
Pregnancy Week Calculator
See how many weeks pregnant you are, your trimester and key milestones.
Ovulation Calculator
Estimate your ovulation day and fertile window for the next cycles.
BAC Calculator
Estimate blood alcohol concentration from drinks, body weight and time.
Child Height Predictor
Predict a child's adult height from the parents' heights.
Bra Size Calculator
Find your bra size from band and bust measurements in US, UK and EU sizing.
Peptide Reconstitution Calculator
Work out concentration and syringe units for a reconstituted peptide dose.
Practical guides
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How to Use BMR Calculator
Calculate your basal metabolic rate (BMR) with the Mifflin–St Jeor, Harris–Benedict or Katch–McArdle formula, plus daily calories by activity level.
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How to Use Daily Calorie Calculator
Find how many calories you need per day to maintain, lose or gain weight, based on your age, sex, height, weight and activity level. Free calorie calculator.
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How to Use Ideal Body Weight Calculator
Estimate your ideal body weight with the Robinson, Miller, Devine and Hamwi formulas, and see the healthy BMI weight range for your height. Free calculator.
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How to Use Body Fat Calculator
Estimate your body fat percentage with a tape measure using the U.S. Navy method, plus fat mass, lean mass and your ACE body fat category. Free calculator.
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How to Use Lean Body Mass Calculator
Calculate your lean body mass (weight without fat) using the Boer, James and Hume formulas, and see your estimated body fat percentage. Free LBM calculator.
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How to Use Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio (WHR), see your health risk level and body shape, and compare with the WHO thresholds for men and women. Free WHR calculator.
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