Why do different calculators give different results?
Different methods use different equations with varying accuracy (BMI-based least, circumference ~3.5%, clinical most).
Health Fitness
Body Fat Percentage Calculator
Calculate body fat percentage with your details.
Personalized estimate
Use realistic inputs for the most useful results.
What this calculator does
Body fat percentage is proportion of weight from fat tissue. Healthy ranges: men 18-25%, women 25-32%. Methods include BMI-based, circumference (US Navy), skinfold, and clinical (DEXA).
How it works
Different methods use different inputs. US Navy method uses circumference measurements with ~3.5% error. BMI-based is least accurate.
Formula
US Navy for men: 86.010 × log₁₀(abdomen-neck) - 70.041 × log₁₀(height) + 36.76.
Tips for using this calculator
- Choose one method and stick with it 8-12 weeks
- Combine with waist circumference assessment
- Be cautious at body extremes—accuracy decreases
- Track monthly, not weekly
- Use alongside performance metrics
Frequently asked questions
Is body fat more important than BMI?
Yes, it directly measures fat rather than just weight-to-height ratio.
How often measure body fat?
Monthly is ideal. Weekly introduces too much noise from hydration and hormonal fluctuations.