BMI Calculator
Calculate your Body Mass Index and see where it sits on the adult BMI scale.
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Fitness & Nutrition Calculators
12 free, easy-to-use tools to estimate your body measurements, energy needs and nutrition targets. Each one explains the formula it uses, so you know exactly where your numbers come from.
Popular calculators
The tools people use most to plan their eating and training.
Calorie Calculator
Estimate daily calories to maintain, lose or gain weight.
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BMR Calculator
Estimate your Basal Metabolic Rate — the energy your body uses at rest.
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TDEE Calculator
Estimate your Total Daily Energy Expenditure from BMR and activity.
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Macro Calculator
Split a calorie target into protein, fat and carbohydrate grams.
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Protein Calculator
Estimate a daily protein range based on weight, activity and goal.
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Body measurements
BMI, body fat and healthy weight estimates.
BMI Calculator
Calculate your Body Mass Index and see where it sits on the adult BMI scale.
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Body Fat Calculator
Estimate body-fat percentage with the U.S. Navy tape-measure method.
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Ideal Weight Calculator
Compare the classic ideal-weight formulas with a healthy weight range.
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Healthy Weight Calculator
Find the healthy weight range for your height and how far you are from it.
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Calories & energy
How much energy your body uses each day.
Calorie Calculator
Estimate daily calories to maintain, lose or gain weight.
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BMR Calculator
Estimate your Basal Metabolic Rate — the energy your body uses at rest.
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TDEE Calculator
Estimate your Total Daily Energy Expenditure from BMR and activity.
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Nutrition
Macros, protein and hydration targets.
Macro Calculator
Split a calorie target into protein, fat and carbohydrate grams.
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Protein Calculator
Estimate a daily protein range based on weight, activity and goal.
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Water Intake Calculator
Estimate how much to drink each day based on weight, exercise and climate.
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Handy utilities
Age and unit conversions for fitness forms.
Age Calculator
Find your exact age in years, months and days for fitness formulas.
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Unit Converter
Convert kg–lb, cm–ft/in, ml–fl oz, kcal–kJ and km–miles.
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