This body-fat calculator estimates body-fat percentage from common anthropometric inputs used in fitness tracking.
Health
Body Fat Calculator
Estimate body fat percentage with the U.S. Navy circumference method.
Calculator
About this calculator
Formula notes
Estimates often rely on circumference-based or BMI-related models. Exact fields depend on the method implemented on the page.
Worked examples
- Example: a male at 175 cm with a 38 cm neck and 85 cm waist gets a Navy-method body-fat estimate of about 16.9%.
- Using a circumference method, changing a waist measurement from 84 cm to 86 cm while other inputs stay fixed can noticeably change the estimate, showing its sensitivity to tape placement.
How to use it
- Enter the measurements requested by the form.
- Use consistent tape positions and units.
- Treat the percentage as an estimate for tracking trends.
Frequently asked questions
How accurate is body-fat estimation?
Consumer formulas are approximate. DEXA and other clinical methods are more precise.
Why can two body-fat methods disagree?
They measure or infer different properties and use different assumptions. Track one method consistently rather than treating estimates as interchangeable.
Limits and interpretation
- Circumference equations are population estimates and are not interchangeable with DEXA, air-displacement, or clinical assessment.
- Tape tension, measurement site, posture, breathing, hydration, and recent exercise can shift repeated readings.