RapidCheck

Body Fat Percentage Calculator

Estimate your body fat percentage using the U.S. Navy method.

Last updated: 8 Aug 2026

Quick answer

This estimates body fat from tape measurements using the U.S. Navy method. For men, body fat % = 495 ÷ (1.0324 − 0.19077×log10(waist − neck) + 0.15456×log10(height)) − 450; women include the hip measurement. Enter your measurements above for an instant estimate and category.

This body fat calculator estimates your body fat percentage from simple tape measurements using the U.S. Navy circumference method — a practical estimate you can do at home without special equipment.

How to calculate body fat percentage

  1. 1 Select your gender and enter your height.
  2. 2 Measure and enter your neck and waist (and hip for women) in centimetres.
  3. 3 We apply the U.S. Navy body-fat formula.
  4. 4 See your estimated body fat percentage and category.

Frequently asked questions

How accurate is the U.S. Navy method?
It is a reasonable estimate for most people (typically within a few percent of more advanced methods) and is far more convenient.
What is a healthy body fat percentage?
Broadly, 10–20% for men and 18–28% for women is considered healthy, varying with age and fitness.
How should I take the measurements?
Measure the neck below the larynx, the waist at the navel, and (for women) the hips at the widest point, keeping the tape snug and level.

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