Health & Fitness Calculators

Free health and fitness calculators for BMI, calories, macros, body fat, pace, and more. Quick estimates to support, not replace, professional guidance.

Tools in this category

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BMI Calculator

Compute body mass index from height and weight.

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Calorie Calculator

Estimate daily calorie needs for your activity level and goal.

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Body Fat Calculator

Estimate body-fat percentage from tape-measure circumferences.

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BMR Calculator

Estimate basal metabolic rate using the Mifflin-St Jeor formula.

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Ideal Weight Calculator

Estimate a target weight range from height using the Devine formula.

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Pace Calculator

Compute running pace, distance, or time from the other two.

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Due Date Calculator

Estimate pregnancy due date from last menstrual period.

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Macro Calculator

Compute daily protein, carb, and fat targets from your calorie goal.

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TDEE Calculator

Estimate total daily energy expenditure from BMR and activity.

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Heart Rate Zone Calculator

Estimate maximum heart rate and five training zones from your age.

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Lean Body Mass Calculator

Estimate lean body mass from height and weight using the Boer formula.

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Body Surface Area Calculator

Estimate body surface area (BSA) from height and weight using Du Bois.

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