BMI Calculator

Body mass index estimates whether your weight is in a healthy range for your height. Enter your measurements in US or metric units.

Your measurements

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Height (in)

Weight (lb)

Result

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About BMI

BMI is weight in kilograms divided by height in meters squared. Adult ranges: under 18.5 is underweight, 18.5–24.9 is normal, 25–29.9 is overweight, and 30 or above is obese. It is a screening number, not a diagnosis — it doesn't distinguish muscle from fat, so athletes and older adults should read it loosely.