Body Fat Percentage Calculator

The Body Fat Percentage Calculator estimates how much of your body weight is fat using the U.S.

Navy circumference method, a widely used approach that needs nothing more than a flexible tape measure.

Enter your sex, height, neck and waist measurements — and your hip measurement if you are female — and the calculator applies the Navy logarithmic formula to return an estimated body fat percentage along with a descriptive category such as athletic, fitness or average.

Because it relies on body shape rather than weight alone, this method captures information a simple scale or BMI figure misses, which is why the military and many coaches adopted it as a fast, low-cost screening tool.

For the most reliable result, measure on bare skin with the tape snug but not compressing, taking the neck just below the larynx, the waist at the navel for men and at the narrowest point for women, and the hip at its widest.

Keep in mind that any tape-based estimate is an approximation: it can differ from a DEXA scan or hydrostatic weighing by several percentage points and is best used to track change over time rather than as an exact figure.

Everything runs entirely in your browser, so your measurements are never uploaded, logged or stored, and it is not a substitute for professional medical advice.