Health & Fitness Calculators
Free health calculators — BMI, calories, body fat, water intake and more.
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BMR Calculator
Basal metabolic rate using the Mifflin-St Jeor formula.
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TDEE Calculator
Total Daily Energy Expenditure for any activity level.
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Calorie Calculator
Daily calories to lose, maintain or gain weight.
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Macro Calculator
Daily carbs, protein and fat for any goal and split.
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Body Fat Calculator
U.S. Navy method body fat percentage from circumferences.
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Ideal Weight Calculator
Devine, Robinson and Miller ideal weight estimates.
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Water Intake Calculator
Daily water needs based on weight and exercise.
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Pregnancy Due Date Calculator
Estimated due date and trimesters from LMP.
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Ovulation Calculator
Predict ovulation day and fertile window.
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Period Tracker
Predict the next 6 menstrual cycles.
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Running Pace Calculator
Pace per km, speed and 5K/10K splits.
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One Rep Max Calculator
Epley and Brzycki 1RM with training percentages.
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Steps to Calories Calculator
Calories burned from daily step count and weight.
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Lean Body Mass Calculator
Boer formula lean body mass from weight and height.
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Waist Hip Ratio Calculator
WHR and cardiovascular risk classification.
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Heart Rate Zone Calculator
Five training zones from max heart rate.
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Target Heart Rate Calculator
Karvonen formula target HR zone for cardio.
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Blood Alcohol Calculator
Estimate BAC with the Widmark formula.
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Healthy Weight Range Calculator
WHO BMI 18.5–24.9 range for your height.
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Protein Intake Calculator
Daily protein based on weight and training goal.
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Body Surface Area Calculator
Du Bois and Mosteller BSA in m².
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Army Body Fat Calculator
U.S. Army circumference body fat method (inches).
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Navy Body Fat Calculator
U.S. Navy circumference body fat method (cm).
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Smoking Cost Calculator
Lifetime cost of cigarettes per day, week, year.