How to use the Body Fat Calculator
This tool estimates body fat percentage from tape measurements using the U.S. Navy method.
Open the Body Fat Calculator →
What you need to enter
- Sex
- Height (cm)
- Weight (kg)
- Neck (cm)
- Waist (cm)
- Hip (cm, women)
The formula
For men: 495 ÷ (1.0324 − 0.19077 × log10(waist − neck) + 0.15456 × log10(height)) − 450. Women use waist + hip − neck and different constants. Measurements are in cm.
Worked example
Using the default values in the calculator:
- Sex: Male
- Height (cm): 175
- Weight (kg): 75
- Neck (cm): 38
- Waist (cm): 85
- Hip (cm, women): 95
| Body fat | 16.9% |
| Fat mass | 12.7 kg |
| Lean mass | 62.3 kg |
Tips for better results
- Measure at the same time of day in the same way.
- Take two or three readings and average them.
Common mistakes to avoid
- Measuring over clothes.
- Treating the result as a clinical measurement.
Please note: Health calculators and guides give general estimates, not medical advice. Talk to a doctor or other qualified professional about your own health. See our Disclaimer.