Health & Fitness

Health & Fitness calculators

BMI, nutrition, fitness zones, and body composition — referenced to authoritative sources.

11 calculators·Updated daily·All formulas visible

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Most searchedQuick screen — useful as a first read, not a diagnosis.

BMI Calculator

Body Mass Index — a screening measure of body fat from height and weight, classified against the WHO adult ranges in US or metric units.

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Common pairings

Cutting weight

TDEECalorie deficitMacro split

Training plan

BMRHeart rate zonesWater intake

Body composition

BMIBody fatIdeal weight

Showing all 11 health & fitness calculators

Body composition

3 calculators

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BMI

Body Mass Index — a screening measure of body fat from height and we…

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Body fat

US Navy body fat estimate from tape-measure circumferences — height,…

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Ideal weight

Ideal body weight range from height and sex — the Devine, Robinson, …

Nutrition

5 calculators

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TDEE

Total daily energy expenditure — calories burned including activity,…

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BMR

Basal metabolic rate — daily calories burned at complete rest, compu…

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Calorie deficit

Daily calorie target for a desired weekly weight loss, using the 3,5…

Daily protein, carb, and fat gram targets from a calorie budget — ba…

Pregnancy

2 calculators

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Due date

Estimated due date from your last menstrual period using Naegele's r…

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Ovulation

Estimated ovulation day and fertile window from your last period and…

Fitness

1 calculators

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Heart rate zones

Training heart rate zones from age and resting heart rate — the Karv…