Math Tools

Body Fat Calculator

Use a browser-based body fat calculator to estimate body fat percentage, fat mass, lean mass, and general body-fat category from common measurements.

Body-composition estimates with clearer supporting context. Runs in your browser Free to use
How It Helps

Body-fat estimates add context that scale weight alone cannot show

Body-fat percentage estimates can be helpful when a person wants more context than scale weight alone, especially for fitness, tracking, or general body-composition awareness.

This calculator combines common measurement-based estimation with fat-mass and lean-mass outputs so the result is easier to interpret in a practical way.

Good to know

Helpful notes

  • Measure waist, neck, height, and hip carefully because small changes can affect the estimate.
  • Use consistent measuring conditions when tracking body-fat changes over time.
  • Treat the result as an estimate rather than a clinical measurement.
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FAQ

Common questions

Helpful answers make each tool page more useful for both visitors and search engines.

What does this calculator estimate?

It estimates body fat percentage and can also show related fat-mass and lean-mass values.

Do I need different measurements for men and women?

Yes. Some body-fat formulas use slightly different measurement inputs depending on sex.

Is this as accurate as a clinical test?

No. It is a practical estimate rather than a clinical or laboratory measurement.

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