Body-Fat Estimate from Tape Measurements
This calculator estimates body fat from height and circumferences without requiring body weight. Differences between waist and neck measurements strongly influence the result, so consistent technique matters.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
Numbers stay on your device. Nothing is sent to a server.
How to use this tool
Use centimetres in metric mode and inches in US mode. The male equation uses height, waist and neck; the female equation also needs hip circumference. Do not interchange waist and hip values.
Results and examples
The percentage is a regression estimate, not a health-risk verdict. If the tool rejects a value outside its output range, check your units; passing validation still does not prove clinical accuracy.
Worked example
Male measurements of 180 cm height, 90 cm waist and 40 cm neck give an estimate of about 18.5%.
Limitations
- The original validation population and measurement landmarks need further review.
- Moving the tape to a different position can change results without real fat change.
Fields
| Field | Guidance and constraints |
|---|---|
| Units | kg and cm / lb and inches |
| Sex | Female / Male |
| Height | Accepted range: 120–230 · Input step: 0.1 |
| Waist | Accepted range: 40–200 · Input step: 0.1 |
| Neck | Accepted range: 20–80 · Input step: 0.1 |
| Hip | Accepted range: 40–200 · Input step: 0.1 |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Frequently asked questions
Why is weight not required?
This equation uses height and selected circumferences instead.
Does a low value mean good health?
A percentage alone cannot establish nutritional status or health.
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You do not need to start over. Continue with the tool that fits your next step.
