What BMI means
BMI is your weight in kilograms divided by your height in metres squared. A person who is 1.70 m tall and weighs 70 kg has a BMI of 70 ÷ (1.70 × 1.70) = 24.2.
| BMI | WHO category | Asian cut-offs |
|---|---|---|
| Under 18.5 | Underweight | Underweight |
| 18.5 to 24.9 | Normal | Normal up to 22.9 |
| 25 to 29.9 | Overweight | Overweight from 23, obese from 27.5 |
| 30 and above | Obese | Obese |
What BMI does not tell you
- It does not separate muscle from fat. Strong, muscular people can have a high BMI and be healthy.
- Where you carry weight matters. A large waist is a separate risk sign, even with a normal BMI.
- It is for adults only. Children and teenagers need BMI-for-age charts, and BMI does not apply during pregnancy.
BMI is a screening number, not a diagnosis. If you are worried about your weight or your health, talk to a doctor.
Frequently asked questions
What is a healthy BMI?
For adults, WHO calls 18.5 to 24.9 a normal BMI. For people of Asian origin, WHO suggests that health risks start to rise from 23.
Why are the Asian cut-offs lower?
Studies found that many Asian people have more body fat and a higher risk of diabetes and heart disease at the same BMI as Europeans, so a WHO expert group suggested action points at 23 and 27.5.
Can I use this for my child?
No. Children and teenagers under 18 need BMI-for-age growth charts. Ask your child's doctor.
Last reviewed: October 2026.
This page was translated from Arabic. If something is unclear or wrong, please tell us.