What this calculator does
This body fat calculator is built for the moment you need a defensible number — quoting a client, comparing options, or checking someone else's math — not a generic estimate.
The US Navy method estimates body fat from circumference measurements.
How to use the Body Fat Calculator
- Enter your values in the fields on the left.
- Results update automatically.
- Use the action buttons to copy, share or print.
The formula
Different formulas for men and women using waist, neck, hip and height.
Worked example
Male 85 waist, 38 neck, 175 tall ≈ 18% BF.
Common mistakes
- Measurement errors
- Not consistent tape tension
- Hydration variation
When to use it
Use as an accessible estimate without a DEXA scan.
Pro tips for the Body Fat Calculator
- Save your favorite scenarios by clicking the star icon — they're stored locally, no account needed.
- For big decisions, run best-case, expected, and worst-case scenarios and compare the breakdowns side by side.
- Copy the result to paste it directly into email, Notion, or a spreadsheet cell.
Frequently asked questions
›Accuracy?
±3% typical.
›Better methods?
DEXA, BIA, hydrostatic.
›Healthy range?
Men 10–20%, women 18–28%.
›Athletes?
Lower — men 6–13%, women 14–20%.
›Track over time?
Same time of day, same conditions.
›Where does the formula come from?
The formula shown in the "How it works" section is the same one you'll find in standard health & fitness references — no proprietary tweaks or hidden weightings.
›Can I use this on mobile?
Yes — the body fat calculator is fully responsive, and results, charts, and the share button all work on phones and tablets.
Embed this calculator
Drop the Body Fat Calculator into your own site or blog post. Free to use — a small “Powered by CalcPilot” link is appreciated.
<iframe src="https://calcpilot.tools/calculators/body-fat-calculator?embed=1" width="100%" height="720" style="border:1px solid #e5e7eb;border-radius:12px;max-width:720px;" loading="lazy" title="Body Fat Calculator — CalcPilot"></iframe>Related calculators
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