Body Fat Calculator

Free body fat calculator to estimate body fat percentage. Instant results in your browser — no signup.

JavaScript is required for live calculation.

You can still read how Body Fat Calculator works, the formula, examples, and FAQs below.

Sex
Height (in)
Neck (in)
Waist (in)
Hip (in, women)

Assessment

Inputs

Sex

Height (in)

Neck (in)

Waist (in)

Hip (in, women)

Results update when you click Calculate.

Estimated body fat

16.5%

Fitness

Circumference method — measurement error is common. Category bands are rough adult male guidelines.

16.5

Fitness

EssentialAthleticFitnessAverageHigh

Balanced meals

30 min activity

Stay hydrated

7–8 hrs sleep

Screening only — not a medical diagnosis.

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Recently used

Tools you open will show up here on this device — with your last inputs when available.

What this result means

Free body fat calculator to estimate body fat percentage. Instant results in your browser — no signup. US Navy circumference formulas using log10 of measurements in inches.

Assumptions

Rule dependency: Formula / population assumption.

How is it calculated?

US Navy circumference formulas using log10 of measurements in inches.

Example

Male 70″, neck 15.5″, waist 34″ → mid-teens to low-20s % depending on precision.

Frequently asked questions

Accurate?+

Rough estimate. DEXA/BodPod are more precise.