Adult BMI calculator

Calculate body mass index from weight and height.

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BMI22.86KG/m²

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Calculate body mass index from weight and height.

BMI = weight in kg ÷ (height in metres)²

Weight (kg): 70; Height (cm): 175.

BMI: 22.86 kg/m².

For adults aged 20+. BMI is a screening measure, not a diagnosis; interpretation varies with muscle mass, pregnancy, and individual context.

Results are rounded for display; calculations use unrounded values. Read our calculation methodology.

BMI relates weight to squared height. It is a screening measure rather than a direct measurement of body fat or a medical diagnosis.

Calculate an adult BMI value to discuss in the context of other health information with a qualified professional.

Input	What to enter
Weight (kg)	Enter a number of at least 1 and no more than 1000.
Height (cm)	Enter a number of at least 30 and no more than 300.

Is this calculator suitable for children?

No. Children and teenagers need age- and sex-specific assessment. The CDC adult tool is intended for people aged 20 and older.

Can BMI distinguish muscle from fat?

No. Body composition and individual circumstances can make a BMI value incomplete or misleading on its own.