How to use the BMI Calculator
- Choose metric or imperial units.
- Enter your height and weight.
- Press Calculate BMI.
BMI Calculator formula
BMI = Weight (kg) ÷ Height (m)²
| Category | WHO | Asian-Indian |
|---|---|---|
| Underweight | below 18.5 | below 18.5 |
| Normal | 18.5 – 24.9 | 18.5 – 22.9 |
| Overweight | 25 – 29.9 | 23 – 24.9 |
| Obese | 30 and above | 25 and above |
Worked example
Height 170 cm, weight 72 kg: BMI = 72 ÷ (1.70 × 1.70) = 24.9 — normal by WHO, overweight by Asian-Indian cut-offs. Healthy range for this height: about 53.5–66.2 kg (Asian) or 53.5–72 kg (WHO).
BMI is a screening number, not a diagnosis. It does not separate muscle from fat, and it is not meant for children, pregnant women or athletes. Talk to a doctor about your health.
Frequently asked questions
How is BMI calculated?
Divide your weight in kilograms by the square of your height in metres.
What is a normal BMI for Indians?
For Asian-Indian adults, 18.5 to 22.9 is considered normal, and 23 or more is overweight.
Is BMI different for men and women?
The formula and adult cut-offs are the same for men and women.
Is BMI accurate?
It is a quick screening tool. Muscular people can have a high BMI without excess fat.
Can children use this BMI calculator?
No. Children need age- and sex-specific BMI charts.