Body Fat Calculator

How the Body Fat Calculator works

Estimates body-fat percentage from the US Navy circumference method: height, waist, neck, and (for women) hip.

Formula / method. Navy: men use height, waist, neck logarithms; women add hip. The result is a percentage, not a DEXA scan.

When to use it. Use it to track a trend with a tape. Do not treat a one-off percentage as a medical finding.

How to run a comparison

1. Open Body Fat Calculator from Home search, the Health & Vitality hub, or this URL.
2. Copy amounts, rates or dates from a document you already have — not a round marketing figure.
3. Read the headline result and any breakdown (schedule, slabs, or intermediate rows).
4. Change one input at a time so you can see what actually moves the answer.
5. Cross-check with a related calculator below, then confirm statutory rates before you act.

Nothing you type is uploaded for server-side processing. Save or screenshot an output if you need it later; we do not keep a server-side history.

Notes and assumptions

Tape placement changes the answer. The Navy method was built on specific populations and errs on others.

Results are estimates for education and planning only. They are not financial, tax, medical, or legal advice. Slabs, scheme rates and product terms change; verify against official notifications or a qualified professional before acting.

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Browse the full Health & Vitality hub or return to the Calculator Universe home catalog for every tool.