What Is The BMI Formula?

Adolphe Quetelet
1796 -1874
How to calculate BMI - for users who wish to manually calculate BMI we have provided a bmi formula for both imperial & metric measurements (we also offer an online BMI Calculator).
Body mass index calculation is very straightforward. Calculating body mass index requires only two measurements, height & weight.
Imperial BMI Formula
The imperial bmi formula accepts weight measurements in pounds & height measurements in either inches or feet.1 foot = 12 inches
inches² = inches * inches
| BMI = ( lbs/inches² ) | (weight in pounds * 703 ) |
| ———————————— | |
| height in inches² |
Metric Imperial BMI Formula
The metric bmi formula accepts weight measurements in kilograms & height measurements in either cm's or meters.1 meter = 100cms
meters² = meters * meters
| BMI = ( kg/m² ) | weight in kilograms |
| ———————————— | |
| height in meters² |
| BMI Calculator | |
BMI | |
Underweight Below | 18.5 |
Normal | 18.5 - 24.9 |
Overweight | 25.0 - 29.9 |
Obesity | 30.0 and Above |
While you get your BMI figure, you may get your ideal body weight . It may be vary for different people