BMI Calculator

BMI Calculator

BMI formula

Body Mass Index estimates weight relative to height. The metric formula is BMI = weight in kg / height in meters². In US units, the formula is weight in lb / height in inches² × 703.

For example, a person weighing 70 kg at 1.75 m has a BMI of about 22.9. The result can help place a measurement into broad categories, but it does not measure body fat directly.

Limitations

BMI can be misleading for athletes, children, pregnant people, older adults, and anyone with unusual muscle or fluid distribution. It also does not account for waist measurement, health history, medication, or fitness level.

Use responsibly

Use BMI as a quick screening estimate only. Medical decisions should be discussed with a qualified health professional.