Fitness & Health Calculators
Free fitness, nutrition, and body-composition calculators — BMI, BMR, TDEE, macros, heart rate zones, body fat, pregnancy, and more. Designed for everyday use; clinical decisions should involve a healthcare provider.
Body composition screening usually starts with BMI, but BMI alone is limited. For a more complete picture, pair it with the body-fat and waist-to-hip ratio calculators.
Weight and fitness goals are built on BMR (rest energy) plus activity to produce TDEE (total daily energy expenditure); the macro, protein, and carbohydrate calculators split TDEE into daily targets.
For cardiovascular training, compute your max heart rate and target zones with the target heart rate calculator, and monitor exertion during exercise.
All fitness & health calculators
BMI Calculator
Body Mass Index and healthy weight range.
Calorie Calculator
Daily calorie needs for goals.
Body Fat Calculator
Body fat percentage (U.S. Navy method).
BMR Calculator
Basal metabolic rate at rest.
Macro Calculator
Protein / carb / fat split for your calories.
Ideal Weight Calculator
Several clinical formulas.
Pregnancy Calculator
Gestational age from last period.
Pregnancy Weight Gain Calculator
Recommended gain by BMI.
Pregnancy Conception Calculator
Approximate date of conception.
Due Date Calculator
Estimated delivery date.
Pace Calculator
Running pace, distance and time.
Army Body Fat Calculator
US Army tape-test body fat.
Carbohydrate Calculator
Recommended carb intake.
Lean Body Mass Calculator
Fat-free mass.
Healthy Weight Calculator
Healthy weight range for your height.
Calories Burned Calculator
Kcal burned by exercise and duration.
One Rep Max Calculator
1RM from a lifted weight and reps.
Target Heart Rate Calculator
Training heart-rate zones.
Protein Calculator
Daily protein recommendation.
Fat Intake Calculator
Daily fat grams target.
TDEE Calculator
Total daily energy expenditure.
Ovulation Calculator
Fertile window from last period.
Period Calculator
Next several periods from cycle length.
GFR Calculator
Glomerular filtration rate (CKD-EPI).
Body Type Calculator
Ectomorph / mesomorph / endomorph.
Body Surface Area Calculator
BSA (DuBois).
BAC Calculator
Blood alcohol concentration estimate.
Anorexic BMI Calculator
BMI in the clinical low range.
Weight Watcher Points Calculator
Classic WW points from macros.
Overweight Calculator
Pounds over a healthy BMI.
Water Intake Calculator
Daily water needs by weight and activity.
Waist-to-Hip Ratio Calculator
WHR and cardiovascular risk category.
Sleep Debt Calculator
Accumulated sleep deficit and how many catch-up nights you need.