What Is Body Fat Calculator?
The Body Fat Calculator estimates your body fat percentage using the US Navy circumference method, which needs nothing more than a tape measure. Women supply neck, waist and hip plus height, while men supply neck, waist and height, because the two equations are genuinely different. Alongside the percentage and its category it works out fat mass and lean mass in both kilograms and pounds.
Who Uses the Body Fat Calculator?
Athletes checking whether their weight change came from fat or muscle, people tracking fat loss alongside the scales, and students learning how circumference methods work use it. Anyone with a tape measure can run it at home as a trend rather than a clinical reading.
How to Use the Body Fat Calculator
- Use the units buttons to choose Metric (kg and cm) or Imperial (lb and in), then select Male or Female so the right equation is used.
- Enter your Weight and Height, then your Waist and Neck measurements, adding the Hip figure as well when you have chosen Female.
- Press the calculate button to get your body fat percentage, your category, and your fat mass and lean mass in kilograms and pounds.
Why Choose Our Body Fat Calculator?
- The US Navy method relies on circumference measurements only, so there is no scale, no caliper and no clinic appointment involved
- The hip field appears for women and is hidden for men, matching the two separate equations rather than forcing one formula on both
- Converts a percentage into fat mass and lean mass in kg and lb, which is what shows whether lost weight was fat or muscle
- Prints the full set of reference bands for your sex, so you can place the figure in a range instead of just seeing a bare number
Try the Body Fat Calculator above — it is free, fast, and works on any device. Bookmark this page to return whenever you need it.