How is BMI calculated?

BMI is weight in kilograms divided by height in metres squared. A person of 70 kg and 1.75 m has a BMI of about 22.9.

What is a healthy BMI?

The WHO range for a normal weight adult is 18.5 to 24.9. Under 18.5 is underweight, 25 to 29.9 overweight and 30 or more obese.

It is a quick screening guide, not a diagnosis. It ignores muscle mass, age and body shape, so talk to a doctor about your health.

BMI calculator

Enter your weight and height to see your Body Mass Index, category and a healthy weight range.

WeightkgHeightcm

Your BMI

22.9

Step 1
Choose units
Metric (kg and cm) or imperial (lb and inches).
Step 2
Enter weight and height
Type your numbers. The result updates instantly.
Step 3
Read your result
See your BMI, category and the healthy weight range for your height.