Body Fat Calculator — The U.S. Navy method estimates body fat percentage from a few circumference measurements — height, neck, waist, and (for women) hip. It correlates reasonably well with DEXA scans for most adults and only needs a tape measure.
All measurements stay in your browser.
Was Body Fat Calculator useful?
What is body fat calculator?
The U.S. Navy method estimates body fat percentage from a few circumference measurements — height, neck, waist, and (for women) hip. It correlates reasonably well with DEXA scans for most adults and only needs a tape measure.
Enter your measurements in inches, your weight in pounds, and the calculator returns your body fat percentage, the category, the equivalent fat mass, and the equivalent lean mass.
How to use it
-
Pick your sex
The formula differs for men and women.
-
Measure
Neck (just below the larynx), waist (at the navel for men, narrowest point for women), hip (women, widest point).
-
Read the result
See your body fat %, the category, fat mass, and lean mass.
Examples
Male, 5'10", 170 lb, neck 15", waist 34"
Typical office worker, light training.
Result: ~19% body fat, fitness category
Female, 5'6", 140 lb, neck 13", waist 28", hip 36"
Active adult.
Result: ~24% body fat, fitness category
Frequently asked questions
Related tools
BMI Calculator
Calculate your Body Mass Index and see where you fall on the healthy range.
Calorie Calculator (BMR + TDEE)
Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE). Includes a goal-adjusted daily calorie target.
Macro Calculator
Calculate daily protein, carb, and fat grams from a calorie target. Four common splits: balanced, high-protein, low-carb, and keto.
Ideal Weight Calculator
Calculate your ideal body weight using four clinical formulas (Devine, Robinson, Miller, Hamwi) plus a healthy BMI range.
Last reviewed: 2026-08-22