Ori ToolsHow to use
- Enter your weight in kg.
- Enter your height in cm.
- Press Calculate.
When to use it
- A quick check before a health visit
- Tracking weight-loss progress
- Understanding a BMI number from a report
Adult BMI categories
BMI is weight in kilograms divided by height in meters squared. The table shows the common adult categories used by the WHO and CDC. Some Asian guidelines, including Korea's, use lower cut-offs such as 23 for overweight and 25 for obesity.
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Healthy weight |
| 25 – 29.9 | Overweight |
| 30 and above | Obesity |
BMI does not measure body fat directly and is not used the same way for children, athletes or pregnancy.
Frequently asked questions
Is BMI accurate for everyone?
No. Muscular people can have a high BMI without excess fat.
Why do Asian cut-offs differ?
Health risks rise at lower BMI in many Asian populations, so some countries use lower thresholds.
Can children use this?
Children need age- and sex-specific growth charts.