Health & Fitness Calculators – Free Tools

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Estimate body mass index and the standard adult screening category.

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Estimate adult body-fat percentage with the U.S. Navy circumference method.

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Estimate daily calorie needs using Mifflin–St Jeor and an activity multiplier.

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Estimate basal metabolic rate with the Mifflin–St Jeor equation.

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Compare several historical height-based reference-weight formulas for adults.

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Estimate gestational age, trimester and due date from the last menstrual period.

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Estimate a pregnancy due date from a last period or conception date.

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Estimate an ovulation date and fertile window from an average cycle.

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Estimate daily water intake with a simple weight and exercise heuristic.

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Convert a calorie target and macro percentages into grams of protein, carbohydrate and fat.