Body Fat Calculator

Estimate your body fat percentage with the US Navy tape method using a few measurements.

Sex

Height (cm)

Neck (cm)

Waist (cm)

Body fat

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Category—

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.

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)

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.