Body Fat Calculator

Estimate body fat with just a tape measure — plus your fat mass and lean body mass.

Runs in your browser — nothing is uploaded

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Informational only — not medical advice. Talk to a doctor or registered dietitian about your health.

How to use Body Fat Calculator

Measure your neck (below the larynx) and waist (at the navel); women also measure hips (widest point).
Enter height and weight.
Read your body fat and lean mass.

How do I measure correctly?

Use a flexible tape, keep it level and snug without compressing the skin, and measure relaxed — not sucking in. Take two readings and average them.