How to use the BMI Calculator
- Enter your weight in kilograms.
- Enter your height in feet and inches.
- Read your BMI, its category and the healthy weight range for your height.
How it's calculated
Show the formula
BMI = weight (kg) ÷ height (m)2
BMI under 18.5 is underweight, 18.5–24.9 healthy, 25–29.9 overweight and 30+ obese. It does not account for muscle, so talk to a doctor about your health.
Worked example
These are the example numbers the calculator opens with. Change any of them above to see your own result.
You enter
| Weight | 72 kg |
|---|---|
| Height | 5 ft |
| Height | 8 in |
You get
| Your BMI | 24.1 |
|---|---|
| Status | Healthy weight |
| Height | 172.7 cm |
| Healthy weight range for your height | 55–74 kg |
Tips
- BMI is a quick screening number, not a diagnosis.
- Muscular people can have a high BMI without extra fat.
Frequently asked questions
What is a healthy BMI?
For most adults, 18.5 to 24.9. Below 18.5 is underweight, 25 to 29.9 overweight and 30 or more obese.
Is BMI accurate for everyone?
No. It doesn't separate muscle from fat and is not meant for children, pregnant women or athletes. A doctor can give a fuller picture.
Do Asian adults use different BMI cut-offs?
Some health bodies suggest lower cut-offs for South Asian adults because health risks can start at a lower BMI. Ask your doctor what applies to you.