ToolCubbyBody Fat Calculator
Estimate your body fat percentage with the U.S. Navy method using simple tape measurements.
How to use this body fat calculator
- Select your gender.
- Enter your height, neck and waist circumferences in centimetres.
- Women: also enter your hip circumference. Men: leave it blank.
- Click Calculate body fat to see your body fat percentage, fat mass and lean mass.
Measure around the neck below the larynx, at the widest point of the waist (navel for men), and around the widest part of the hips for women.
How the US Navy method works
Body fat % (men) = 495 / (1.0324 − 0.19077·log₁₀(waist − neck) + 0.15456·log₁₀(height)) − 450 Body fat % (women) = 495 / (1.29579 − 0.35004·log₁₀(waist + hip − neck) + 0.22100·log₁₀(height)) − 450
Fat mass is body fat % × weight; lean mass is the remainder. A healthy range is roughly 10–20% for men and 18–28% for women.
FAQ
What is the US Navy method?
A tape-measure formula that estimates body fat percent from height, neck and waist girths (and hip girth for women).
How accurate is it?
Usually within a few percentage points of lab methods. Measure consistently for the most useful trends.
Is it private?
Yes — it runs entirely in your browser.