Use the free Accurate Body Fat Calculator on ToolVexa to estimate body fat percentage from simple tape measurements. Enter your waist, neck and height, plus hip for women, choose male or female, press Calculate, and the estimate appears straight away.
How to Use
Measure your waist at the navel, your neck below the Adam’s apple and your height, all in centimetres. Women also enter the hip measurement at its widest point. Choose your sex and press Calculate.
Formula in Plain Words
This uses the U.S. Navy method. It compares the waist, neck and height (and hip for women) using logarithms, which give more weight to differences at smaller measurements, and converts the result into a body fat percentage.
Worked Example
For a man with a 90 cm waist, a 40 cm neck and a height of 180 cm, the estimate is about 18.4% body fat. Tape tension and posture can shift the result, so measure carefully.
FAQs
Is this as accurate as a scan? No. It is a practical estimate; scans and other lab methods are more precise.
Should I measure over clothes? No. Measure directly on the skin for the best result.
Is this medical advice? No. It is a planning estimate only.