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Body Fat Calculator

Use the Body Fat to work through body Fat from the values you enter. Review the notes below the result so you understand what the figure represents.

Body fat
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This is an estimate for general guidance, not medical advice. For a plan that fits you, talk to a doctor or qualified professional.

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Sources & methodology

Last reviewed January 15, 2026 — see our editorial & accuracy policy.

Method: Estimates body fat with the US Navy circumference method (log formulas of waist, neck, hip and height), accurate to within roughly ±3% for most adults versus lab measurement.

How it works

US Navy circumference method (log10 of neck, waist, hip and height)

How to use the Body Fat

Enter the requested values and start with one realistic example. Read the result together with its unit or label, then change one input at a time if you want to compare options.

This is a general estimate and cannot replace advice from a qualified health professional.

Frequently Asked Questions

How does the Body Fat Calculator work?
Estimate your body fat percentage with the US Navy tape method using a few measurements.
Is this medical advice?
No. It gives general estimates only. For decisions about your health, speak with a qualified professional.
Can I use the result as an exact answer?
Treat it as an estimate or check unless the page and the rules that apply to you confirm otherwise. Rounding, fees and personal details can change the final result.