Free Health & Fitness Calculators

Free health and fitness calculators — calorie needs, macros, and more. Estimates for general information only, not medical advice.

TDEE Calculator

Calculate your daily calorie needs (TDEE) and BMR from age, weight, height, and activity.

Split your daily calories into protein, carbs, and fat for your goal.

Calculate your Body Mass Index from height and weight, with your healthy-weight range — metric or imperial.

Estimate your body fat percentage using the U.S. Navy method from a few body measurements.

Find your ideal body weight range for your height using the Devine, Robinson, and BMI methods.

Estimate your due date and current week of pregnancy from your last period or conception date.

Calculate running pace, time, or distance — and see race-time predictions for 5K to marathon.

Estimate your fertile window, ovulation day, and next periods from your cycle length.

Estimate calories burned for 20+ activities from your weight and workout duration using MET values.

Find how much water to drink each day based on your weight, activity, and climate.

Find the best bedtime or wake-up time based on 90-minute sleep cycles.

Calculate your Basal Metabolic Rate — the calories your body burns at rest.

Find your target heart-rate training zones from your age and resting heart rate.

Estimate your 1-rep max (1RM) for any lift from the weight and reps you performed.