KLOORAHow to Calculate Body Fat Percentage With a Tape Measure
Published 2 November 2026 by Kloora Tools
Quick answer: use the free Body Fat Calculator to estimate your body fat percentage from tape measurements (US Navy method). It runs in your browser, so nothing you enter is uploaded or stored, and there is no signup.
What is the Body Fat Calculator?
Estimate your body fat percentage from tape measurements (US Navy method). People often search for it as "body fat calculator", "body fat percentage calculator" or "navy body fat calculator". This free version works on any phone or computer and needs no download.
How to use the Body Fat Calculator
- Open the Body Fat Calculator.
- Enter your values in the fields.
- The results update instantly as you type.
- Note or copy the numbers you need.
How it works
The US Navy method uses height, neck and waist (and hip for women) in a logarithmic formula to estimate body fat percentage. Fat mass is your weight times that percentage and lean mass is the rest. It is an estimate, usually within a few percentage points.
Worked example
- Input: Sex: Male; Height (cm): 175; Weight (kg): 75; Neck (cm): 38; Waist (cm): 85; Hip (cm, women): 95
- Result: Body fat: 16.94%; Fat mass: 12.70 kg; Lean mass: 62.30 kg
Common uses
- Track progress when the scale does not move
- Check fitness without special equipment
- Set a realistic body composition goal
Second worked example
Here is the same tool with larger numbers, so you can see how the result scales.
- Input: Sex: Male; Height (cm): 262.5; Weight (kg): 112.5; Neck (cm): 57; Waist (cm): 127.5; Hip (cm, women): 142.5
- Result: Body fat: 19.76%; Fat mass: 22.23 kg; Lean mass: 90.27 kg
Tips for the best result
- Measure yourself the same way each time, ideally in the morning and before eating.
- Use the result as a guide and look at the trend over weeks, not a single day.
- Choose the activity level honestly, because most people overestimate it.
- Talk to a doctor or a qualified coach before making big changes to diet or training.
Common mistakes to avoid
- Entering pounds or inches in a field that expects kilograms or centimetres.
- Treating an estimate as a medical diagnosis.
- Comparing your result with someone of a different age, sex or build.
- Changing several things at once, so you cannot tell what worked.
Body Fat Calculator compared with doing it by hand
| Body Fat Calculator | By hand or in a spreadsheet | |
|---|---|---|
| Speed | Instant, results update as you type | Slow, you rebuild the steps each time |
| Accuracy | Same standard method every time | Easy to slip on a formula or a unit |
| Privacy | Runs in your browser, nothing uploaded | Depends on the software you use |
| Cost | Free, no signup | Free or paid software needed |
Try it now
Open the Body Fat Calculator and try your own numbers or text. If it helps, share it with someone who needs it.
Frequently asked questions
How accurate is this?
The Navy method is an estimate, usually within a few percent. DEXA scans are more accurate.
Where do I measure?
Measure the neck below the larynx, the waist at the navel for men or the narrowest point for women, and the hips at the widest point.
What does the Body Fat Calculator do?
Estimate your body fat percentage from tape measurements (US Navy method).
How do I use the Body Fat Calculator?
1. Enter your values in the fields. 2. The results update instantly as you type. 3. Note or copy the numbers you need.
Is my data safe when I use the Body Fat Calculator?
Yes. Everything runs in your browser on your own device. Nothing you type or choose is uploaded, stored or shared, and no AI service is used.
Does the Body Fat Calculator work on a phone?
Yes. It works on phones, tablets and computers in any modern browser, with nothing to install.
Do I need an account or a payment to use the Body Fat Calculator?
No. It is free, has no daily limit, no watermark and needs no signup.
What information does the Body Fat Calculator need?
You enter: Sex, Height (cm), Weight (kg), Neck (cm), Waist (cm), Hip (cm, women). The results update instantly as you change any value.
How does the Body Fat Calculator work?
The US Navy method uses height, neck and waist (and hip for women) in a logarithmic formula to estimate body fat percentage.
Can I use this for "body fat percentage calculator"?
Yes. The Body Fat Calculator is built for exactly that, and it also answers searches such as "body fat calculator" and "navy body fat calculator".
How accurate is the Body Fat Calculator?
It uses the standard method and shows results to a sensible precision. For legal, medical, financial or safety decisions, confirm important numbers with a qualified professional.
Where can I find more free tools like the Body Fat Calculator?
Kloora Tools has over 150 free tools for CVs, PDFs, images, Urdu, calculators and everyday tasks. Browse them all from the home page.
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