Health & Fitness calculators

Estimate body composition, daily energy requirements and training targets using the same equations used in clinical and sports-science literature. Every input is explained so you understand where the number comes from.

Please note: Health calculators on this site provide general estimates based on population-level formulas. They are not medical advice and cannot account for your individual medical history. Speak to a qualified healthcare professional before making decisions about diet, medication or training.

• BMI CalculatorBody Mass Index from height and weight, with the WHO category.
• BMR CalculatorBasal metabolic rate — the energy your body uses at complete rest.
• Body Fat CalculatorBody-fat percentage from tape measurements (US Navy method).
• Calorie CalculatorDaily calorie needs (TDEE) for maintaining, losing or gaining weight.
• Ideal Weight CalculatorReference body-weight ranges from four established clinical formulas.
• Macro CalculatorSplit daily calories into protein, carbohydrate and fat targets.
• Protein CalculatorDaily protein target based on body weight and training goal.
• Running Pace CalculatorPace, time or distance for runs — solve for whichever you're missing.
• Water Intake CalculatorDaily fluid target based on body weight, activity and climate.

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