Body Fat Calculator

Estimate body fat percentage using the US Navy body circumference method.

Waist (cm) Neck (cm) Height (cm) Calculate

About Body Fat Calculator

Estimate body fat percentage using the US Navy body circumference method.

Formula

US Navy Method: 495/(1.0324 – 0.19077×log(waist–neck) + 0.15456×log(height)) – 450

Example

Waist 85 cm, Neck 38 cm, Height 178 cm → ~16.5% body fat.

How to Use

Enter your values in the fields above and click "Calculate" to get instant results. All calculations happen in your browser — nothing is sent to any server.

Frequently Asked Questions

What is Body Fat Calculator?
Estimate body fat percentage using the US Navy body circumference method.

What formula does this use?
This calculator uses: US Navy Method: 495/(1.0324 – 0.19077×log(waist–neck) + 0.15456×log(height)) – 450

Is this calculator free?
Yes! All calculators on CalcNest AI are 100% free with no account required.

Is my data safe?
Absolutely. All calculations run locally in your browser. We never store or transmit your input data.

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