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Health & Fitness Calculators
Evidence-based health calculators to estimate Body Mass Index (BMI), U.S. Navy body fat percentage, Karvonen heart rate zones, daily calorie expenditure (TDEE), and optimal daily hydration.
Calculation.zone — Printable Estimate Sheet
10/24/2026Body Fat Percentage
Body Fat Percentage
Estimate body fat percentage, lean body mass, and fat mass using the U.S. Navy circumference method.
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Body Fat Calculator (U.S. Navy Method)
Body Circumference Measurements
Measure just below the Adam's apple
Measure horizontally at the navel
Body Composition
Estimated Body FatFitness
16.5%
Category: Fitness
Fat Mass28.9 lbs
Lean Body Mass146.1 lbs
ACE Body Fat Categories
ClassificationMen (% Fat)
Essential Fat2 - 5%
Athletes6 - 13%
Fitness14 - 17%
Average18 - 24%
Obese25%+