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.
BMI Calculator
Calculate your Body Mass Index from height and weight, with your healthy-weight range — metric or imperial.
Pregnancy Due Date Calculator
Estimate your due date and current week of pregnancy from your last period or conception date.
Pace Calculator
Calculate running pace, time, or distance — and see race-time predictions for 5K to marathon.
Ovulation Calculator
Estimate your fertile window, ovulation day, and next periods from your cycle length.
Sleep Calculator
Find the best bedtime or wake-up time based on 90-minute sleep cycles.
Macro Calculator
Split your daily calories into protein, carbs, and fat for your goal.
Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method from a few body measurements.
Ideal Weight Calculator
Find your ideal body weight range for your height using the Devine, Robinson, and BMI methods.
Calories Burned Calculator
Estimate calories burned for 20+ activities from your weight and workout duration using MET values.
Water Intake Calculator
Find how much water to drink each day based on your weight, activity, and climate.
BMR Calculator
Calculate your Basal Metabolic Rate — the calories your body burns at rest.
Heart Rate Zone Calculator
Find your target heart-rate training zones from your age and resting heart rate.
One Rep Max Calculator
Estimate your 1-rep max (1RM) for any lift from the weight and reps you performed.