How is BMI calculated?

BMI is your weight in kilograms divided by your height in metres squared (kg/m2). A BMI under 18.5 is underweight, 18.5 to 24.9 is a healthy weight, 25 to 29.9 is overweight and 30 or above is obese.

BMI is a quick screening tool but it does not measure body fat directly and can misclassify very muscular people. Use it as a general guide alongside other measures like waist size and body composition.

BMI calculator

Enter your height and weight to see your Body Mass Index and where it falls on the healthy-weight scale.

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What is BMI?

Body Mass Index (BMI) is your weight in kilograms divided by your height in metres squared. It's a quick way to screen whether your weight is in a healthy range for your height: under 18.5 is underweight, 18.5–24.9 is healthy, 25–29.9 is overweight and 30+ is obese.

BMI has limits

BMI doesn't measure body fat directly and can misclassify muscular people. Pair it with your daily calorie target and waist measurement for a fuller picture.

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