Many people want more than BMI because BMI is a body-weight ratio, not a body-composition measure. The more useful question is usually: roughly how much body fat do I have, and is it moving down, holding steady, or trending up? This body fat calculator is built for that more practical kind of check.
The page shows two body-fat estimates, then gives you an average result, a range-style category, and simple guidance. Its biggest value is not pretending to reveal a perfect truth. Its value is helping you follow direction and change more steadily over time.
Gender affects the estimation logic, the category ranges, and whether hip measurement is needed in female mode.
Age influences one of the estimation methods, so the same height and weight can map to slightly different body-fat estimates at different ages.
Because the methods use different body signals, and seeing both together usually gives a steadier reference range than trusting one number alone.
Because the circumference-based method uses hip measurement in female mode, so it directly affects that estimate.
No. It is much better for home estimation, repeat tracking, and direction-of-change checks than for replacing professional scans or measurement systems.
It works best when you measure the same way each time, such as weekly or monthly, and use it to watch trends instead of chasing perfect single-read accuracy.
Estimate body fat percentage for men and women from height, weight, waist, neck, and hip measurements, with BMI, Navy method, and average results.