BMI Calculator

Calculate body mass index from height and weight and see the standard BMI category associated with the result.

BMI Calculator

BMI, or body mass index, is a simple screening measure that relates body weight to height. The BMI Calculator provides the numerical BMI and can help you understand where the result falls within commonly used adult BMI categories.

BMI formula

When weight is in kilograms and height is in meters, BMI = weight ÷ height². For pounds and inches, the equivalent formula is BMI = (weight × 703) ÷ height².

Using the calculator

Enter your weight and height using the units requested. Check that the height has not been entered as a total number of inches when the calculator expects feet and inches, or vice versa.

Interpreting BMI

For adults, commonly used screening ranges classify BMI below 18.5 as underweight, 18.5 to 24.9 as normal weight, 25.0 to 29.9 as overweight, and 30.0 or higher as obesity. BMI does not directly measure body fat or account for every difference in body composition.

Frequently Asked Questions FAQ

What is BMI?
BMI stands for body mass index and is a screening measure based on weight relative to height.
How is BMI calculated?
BMI is calculated by dividing weight in kilograms by height in meters squared, or by using the equivalent pounds-and-inches formula.
What is a normal BMI range for adults?
For adults, 18.5 to 24.9 is commonly used as the normal-weight screening range.
Does BMI directly measure body fat?
No. BMI does not directly measure body fat and may not reflect body composition in every person.

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