Body Fat Percentage Calculator

This calculator estimates your body fat percentage using the US Navy tape method, a quick way to gauge body composition in New Zealand from a few measurements and no special equipment. The bathroom scales tell you your weight but nothing about how much of it is fat versus muscle, and methods like DEXA scans or callipers need a clinic or skill, so the Navy method has become popular precisely because anyone can do it at home with a soft tape measure. It works from the circumference of your neck and waist for men, with the hip added for women, together with your height, and applies a formula developed by the US Navy that correlates reasonably well with more precise methods for people of average build. You choose your sex, enter your height, neck and waist measurements in centimetres, and your hip if you are female, and the calculator returns your estimated body fat percentage. It is an estimate, most accurate for typical builds and less so for very muscular or very lean people, but its real strength is consistency: measured the same way each time, it tracks changes in your body composition over weeks and months far better than weight alone. Healthy ranges differ by sex and age. This is general information, not medical advice; speak to a health professional for guidance.

An estimate, most accurate for average builds. Measure consistently to track change over time. General information, not medical advice.