Body mass index (BMI) Measure the relationship between your weight and your height. Here’s how you find yours:
- Multiply your weight in pounds by .45 to gain weight.
- Take your height in inches and multiply it by 0.0254 to get meters.
- Multiply that number by itself.
- Divide this into your weight in kilos. This is your BMI Healthy range rated from 19 to 25 according to the National Examination Survey.