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Tape Body Fat Calculator
Estimates body fat percentage from neck, waist and hip measurements using the US Navy circumference method.
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Enter your figures and press Calculate.
In short
Tape Body Fat Calculator is a free online tool on inputtesthub.com that estimates body fat percentage from neck, waist and hip measurements using the US Navy circumference method. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the Tape Body Fat Calculator
- Enter your figures in the input fields.
- The result updates as you type, together with the full working.
- Check the breakdown table to see exactly how the number was reached.
About the Tape Body Fat Calculator
The Tape Body Fat Calculator estimates body fat percentage from neck, waist and hip measurements using the US Navy circumference method. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Tracking body composition without callipers.
- Estimating fat and lean mass from a tape measure.
- Checking a trend across weeks.
Details
| Male athletic | 6–14% |
|---|---|
| Male fitness | 14–18% |
| Female athletic | 14–21% |
| Female fitness | 21–25% |
| Typical error | 3–4 points vs DEXA |
The maths behind it
This tool uses The US Navy circumference equations use log₁₀ of waist minus neck against height for men, and waist plus hip minus neck for women. Every intermediate value is shown on screen, so the result can be checked by hand.
A screening estimate with a typical error of three to four percentage points against a DEXA scan, and systematically off for very lean and very heavy people. Measure at the same time of day, tape snug but not compressing. Its value is the trend, not the single number.
Frequently asked questions
Is the Tape Body Fat Calculator free?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Is what I paste into the Tape Body Fat Calculator stored?
No. The Tape Body Fat Calculator runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
How is the result calculated?
It uses The US Navy circumference equations use log₁₀ of waist minus neck against height for men, and waist plus hip minus neck for women. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What problem does the Tape Body Fat Calculator solve?
The jobs it is built for: tracking body composition without callipers. Estimating fat and lean mass from a tape measure. Checking a trend across weeks. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Any caveats I should know about?
A screening estimate with a typical error of three to four percentage points against a DEXA scan, and systematically off for very lean and very heavy people. Measure at the same time of day, tape snug but not compressing. Its value is the trend, not the single number.
What are the reference figures here?
Male athletic is 6–14%. Male fitness is 14–18%. Female athletic is 14–21%. These are printed on the page itself, so you do not have to take them on trust.
Is the number rounded?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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