Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy circumference method.
Estimates only — not professional financial, medical, legal or engineering advice. Read full disclaimer.
Calculating...
Result
Fill in the form and click Calculate to see your result here.
How it's calculated
Men: BFP = 495 ÷ (1.0324 − 0.19077×log₁₀(waist−neck) + 0.15456×log₁₀(height)) − 450. Women: BFP = 495 ÷ (1.29579 − 0.35004×log₁₀(waist+hip−neck) + 0.221×log₁₀(height)) − 450.
Example
Example: Body Fat Calculator
Inputs
- Gender: male
- Waist: 85
- Neck: 38
- Height: 175
- Hip: 0
Outputs
- Body Fat Percent: 16.9
- Category: Fitness / Acceptable
This example uses typical sample values. Adjust the inputs above to see how the results change for your own numbers.
About this calculator
The Body Fat Calculator estimates your body fat percentage using the U.S. Navy circumference method, which uses waist, neck (and for women, hip) measurements alongside height - no calipers or scales required.
Frequently Asked Questions
It's a well-validated estimation method with a typical margin of error of around 3-4%, making it a convenient alternative to skinfold calipers or DEXA scans for most people.
Men and women tend to store fat differently, so the Navy method uses different circumference measurements and coefficients for each - women's calculations additionally factor in hip circumference.
You need waist and neck circumference for men, plus hip circumference for women, all measured in centimeters, along with your height.
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