Estimate body fat from tape measurements.
These calculators use established formulas (such as Mifflin-St Jeor for calorie needs or the Devine formula for ideal weight) to provide general estimates. They're built for a general population and don't account for individual medical conditions, medications, or circumstances. They aren't a substitute for advice from a doctor, registered dietitian, or other qualified healthcare provider — especially for anything related to pregnancy, chronic conditions, or medication dosing.
US Navy method uses tape-measured circumferences (neck, waist, hip for women) and height in a validated regression.
Less accurate than DEXA but requires only a tape measure — great for tracking progress at home.
Because it's based on circumference rather than direct tissue measurement, this method works best for tracking your own trend over weeks and months rather than comparing your exact number against someone else's.
175 cm male, 40 cm neck, 85 cm waist: estimated body fat ≈ 15.4%.
Typically within ±3% of DEXA for average bodies; less accurate at extremes.
Men 10–20% healthy, athletes 6–13%. Women 18–28% healthy, athletes 14–20%. Essential fat 3–5% men, 10–13% women.
Bare skin, tape snug but not compressing. Same time of day (ideally morning) for consistent tracking.
Body fat percentage and total weight are different measurements — you can gain muscle and lose fat simultaneously, shifting body fat percentage while the scale stays flat.