Check your BMI
Body Mass Index is a quick way to see whether your weight sits in a healthy range for your height. Enter your details in whichever units suit you and get your BMI plus the WHO category instantly, calculated privately on your device.
How to use it
- Choose metric or imperial units.
- Enter your height and weight.
- Read your BMI and category.
Frequently asked questions
How is BMI calculated? BMI = weight (kg) ÷ height (m)². This calculator does the maths for you in metric or imperial units.
What is a healthy BMI? The WHO ranges are: under 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, and 30+ obese.
Is BMI always accurate? BMI is a useful general guide but does not distinguish muscle from fat or account for age and build, so treat it as one indicator among several.
Is my data stored? No. The calculation runs in your browser and nothing you enter is saved or sent anywhere.