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BMI calculator
Calculate your body mass index (BMI) from your weight and height, in metric or imperial units. You see your WHO category, the weight range that counts as healthy for your height and the BMI Prime. Free, and nothing is uploaded.
How to calculate your BMI
- 1Pick metric (kg, cm) or imperial (lb, ft, in)
- 2Enter your weight and your height
- 3Read your BMI and category
- Your BMI, category and healthy weight range.
What you get
- Your BMI and WHO category.From severe thinness to obesity class III, with the BMI value next to it.
- A healthy range, kg or lb.The weight band for your height, from BMI 18.5 to 24.9.
- Nothing leaves your device.The sum is done in your browser. No account, no upload.
What you can do
- Enter weight and height in kilograms and centimeters, or in pounds, feet and inches.
- See your BMI to one decimal and the matching WHO adult category.
- Read the weight range that counts as healthy at your height.
- See the BMI Prime, your BMI divided by 25.
- Check a table that shows, for your height, the weight at which each category starts.
Good to know
- The categories are the WHO adult ones: under 18.5 is underweight, 18.5 to under 25 is healthy, and 25 and above is overweight.
- BMI does not tell muscle from fat. It is not meant for athletes or for children.
- US English visitors start in imperial units, everyone else in metric. You can switch at any time.
Questions
How do I calculate my BMI?
BMI is your weight in kilograms divided by your height in meters squared. The calculator does that for you, also from pounds, feet and inches.
What is a healthy BMI?
The WHO treats 18.5 up to 25 as the healthy range for adults. The tool also shows what that means in kilos or pounds at your height.
What is BMI Prime?
It is your BMI divided by 25. A value of 1.0 is the top of the healthy range, and below 1.0 is under it.
Is the BMI calculator free, and is my data kept?
It is free and needs no sign-up. Your numbers are worked out in your browser and are not sent to us.