BMI Calculator
Enter your height and weight to find your Body Mass Index, your weight category and the healthy weight range for your height. Works in metric and imperial units.
Your BMI
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Category—
Healthy weight range—
Height used—
Enter your height and weight.
How to use the BMI Calculator
Choose metric (cm / kg) or imperial (ft, in / lb) units.
Enter your height and weight.
Press Calculate BMI to see your index, category and healthy weight range.
Frequently asked questions
What is BMI?
Body Mass Index is your weight in kilograms divided by your height in metres squared (kg/m²). It is a quick screening tool, not a diagnosis.
What are the BMI categories?
Underweight is below 18.5, normal weight is 18.5 to 24.9, overweight is 25 to 29.9 and obese is 30 or above.
Does BMI apply to everyone?
BMI is a general guide for adults. It can misclassify athletes and does not apply to children, pregnant women or the elderly, so use it alongside professional advice.