Body Fat Calculator
Estimate body fat percentage from circumference measurements.
This page is an editable estimator with realistic defaults so you can model your own situation in minutes.
The calculator uses a circumference-based body fat estimate with waist, neck, hip, height, and sex inputs.
Treat the result as a planning estimate and verify important numbers with the relevant official source before acting.
| Waist/abdomen | 30 in | |
|---|---|---|
| Neck | 13 in | |
| Hip | 38 in |
Assumptions
- Circumference estimates are sensitive to tape placement.
- This is not a clinical body composition test.
How this calculator works
Formula used
The calculator uses a circumference-based body fat estimate with waist, neck, hip, height, and sex inputs.
Example calculation
Plug in your own numbers and the result updates instantly. The calculator uses a circumference-based body fat estimate with waist, neck, hip, height, and sex inputs.
Body Fat Calculator FAQ
Is this body fat calculator medical advice?
No. It is an educational estimate only and should not be used to diagnose, treat, or make medical, nutrition, legal, or emergency decisions.
Why might my real result be different?
Age, sex, body composition, pregnancy, medications, medical conditions, training status, lab methods, and measurement accuracy can all change real-world results.
Should I check these results with a professional?
Yes. Confirm health, nutrition, fitness, kidney function, alcohol, or safety decisions with a qualified professional or official source.