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BMI Calculator

Calculate body mass index from height and weight, in metric or imperial units, in your browser.

22.9

Normal weight

How it works

BMI is weight in kilograms divided by height in meters squared. Imperial inputs are converted to metric first using the exact pound-to-kilogram and inch-to-meter ratios, so the result is identical either way.

Reading the category

The standard adult ranges are under 18.5 for underweight, 18.5 to 25 for normal weight, 25 to 30 for overweight, and 30 and above for obese. These thresholds come from World Health Organization guidance for the general adult population.

What BMI does not capture

BMI cannot tell muscle from fat, so it can read high for very muscular people and normal for people with low muscle mass and high body fat. It is a quick, population-level screening tool, not an individual diagnosis.

Frequently asked questions

What do the BMI categories mean?

They follow the World Health Organization’s standard adult ranges: under 18.5 is underweight, 18.5 to 25 is normal weight, 25 to 30 is overweight, and 30 or above is obese.

Is BMI a complete measure of health?

No. BMI does not distinguish muscle from fat, and can misclassify very muscular or very lean people. It is a quick screening number, not a diagnosis — talk to a healthcare provider for a fuller picture.