Units
100 cm220 cm
20 kg200 kg
Your BMI
0.0
Normal weight
18.52530
Healthy weight for your height–
Difference from healthy range–
What is BMI and how is it calculated?
Body Mass Index (BMI) is a simple number that compares your weight to your height. Doctors and health organisations use it as a quick screening tool to see whether a person may be underweight, in a healthy range, or overweight.
BMI = weight (kg) ÷ height (m)²
BMI = 703 × weight (lb) ÷ height (in)²
BMI = 703 × weight (lb) ÷ height (in)²
For example, a person who weighs 70 kg and is 1.70 m tall has a BMI of 70 ÷ (1.70 × 1.70) = 24.2, which is in the normal range.
BMI categories (WHO)
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 to 24.9 | Normal weight |
| 25 to 29.9 | Overweight |
| 30 and above | Obese |
A note for South Asians
Research suggests South Asian adults can have a higher health risk at a lower BMI. Some Indian guidelines therefore use lower cut-offs, treating a BMI from 23 as overweight and 25 and above as obese. Ask your doctor which range is right for you.
Please note: BMI is a screening tool, not a diagnosis. It does not measure body fat or muscle, so it can be misleading for athletes, older adults, pregnant women and children. For health advice, please consult a qualified doctor.