Fitness Tool ยท ๐Ÿ’ช

Body Fat Estimator

Estimate body fat percentage using the US Navy method. Neck, waist, height measurements. Free, no sign-up.

๐Ÿ“– Read the complete Body Fat Estimator guide โ†’

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๐Ÿ”’ All calculations happen in your browser. No data is sent to any server. No sign-up required.
Body Fat %

Formula

BF% = 495 รท (1.0324 โˆ’ 0.19077ร—logโ‚โ‚€(waistโˆ’neck) + 0.15456ร—logโ‚โ‚€(height)) โˆ’ 450

Example

Neck 37, waist 85, height 175 โ†’ ~18.5% Athletic

Frequently Asked Questions

Healthy body fat ranges?

Men: 6-17% athletic, 18-24% acceptable. Women: 14-20% athletic, 21-31% acceptable.

Is BMI or body fat more accurate?

Body fat % is more meaningful โ€” BMI does not distinguish muscle from fat.

How do I measure accurately?

Measure at consistent times (morning, fasted). Use a flexible tape at widest points.

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