BMI Calculator — Body Mass Index
CalculatorA BMI calculator computes body mass index (kg/m²) from height and weight to classify weight status.
What is it
BMI (Body Mass Index) is weight (kg) divided by height (m) squared, an international indicator of body weight status. This tool uses the Asian-Pacific cutoffs (18.5–23 normal, 23–25 overweight, 25+ obese), which are stricter than the WHO international cutoffs.
How to use
- 1Enter your height (cm).
- 2Enter your weight (kg).
- 3Press calculate to see BMI and category.
Reference
| Category | BMI range |
|---|---|
| Underweight | < 18.5 |
| Normal | 18.5 ~ 23 |
| Overweight | 23 ~ 25 |
| Obese | ≥ 25 |
Sources & standards
- Adult BMI categories - CDC
- Appropriate body-mass index for Asian populations - WHO Expert Consultation
FAQ
What is the BMI for 170cm and 65kg?
65 ÷ 1.7² ≈ 22.49, which is normal.
What is a normal BMI range?
A BMI of 18.5–23 is considered normal (Asian standard).
Why do Asian cutoffs differ from WHO international ones?
At the same BMI, Asian populations carry a higher metabolic risk, so the Asian-Pacific standard treats 18.5–23 as normal instead of the WHO international 18.5–25.
What are the limitations of BMI?
BMI ignores muscle mass and fat distribution, so it can misclassify muscular or elderly people. Use it as a screening reference and consult a clinician for a proper assessment.