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Calculators that show the math.

Precise readings, the formula behind every result, and no account to create. Built to work on any device.

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Find your body mass index, category, and healthy weight range, with WHO or Asian cutoffs.

Find your basal metabolic rate from three formulas at once: Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle.

Find your total daily energy expenditure and the calories to lose, maintain, or gain weight.

Estimate your body fat percentage with the US Navy tape method, plus fat mass, lean mass, and FFMI.

Turn your calories into daily protein, carbs, and fat, with presets for balanced, low-carb, high-protein, and keto.

Work out how many calories to eat a day to lose, maintain, or gain weight, with a choice of formula.