⚖️ BMI Calculator
Enter your height and weight to instantly calculate your Body Mass Index. Includes both WHO and Asian (Korean) classification standards.
BMI (Body Mass Index)
-
BMI
-
kg/m²
WHO Classification
-
Asian Classification
-
Normal Weight Range
-
kg
📐 Formula
BMI = Weight (kg) ÷ Height (m)²
Example: Height 170cm, Weight 65kg
→ BMI = 65 ÷ (1.70)² = 65 ÷ 2.89 = 22.5
| Category | WHO Standard | Asian Standard |
|---|---|---|
| Underweight | Below 18.5 | Below 18.5 |
| Normal | 18.5 – 24.9 | 18.5 – 22.9 |
| Overweight | 25.0 – 29.9 | 23.0 – 24.9 |
| Obese Class I | 30.0 – 34.9 | 25.0 – 29.9 |
| Obese Class II | 35.0 and above | 30.0 and above |
💡 Examples
Example 1 – Normal Weight
- Height
- 170cm (5'7")
- Weight
- 65kg (143 lb)
- BMI
- 22.5 → Normal (WHO), Normal (Asian)
Example 2 – Overweight by Asian Standard
- Height
- 175cm (5'9")
- Weight
- 80kg (176 lb)
- BMI
- 26.1 → Overweight (WHO), Obese Class I (Asian)
❓ Frequently Asked Questions
BMI (Body Mass Index) is a number calculated by dividing weight in kilograms by height in meters squared. Recommended by the WHO, it's the most widely used screening tool to assess whether an adult's weight is healthy.
According to WHO, 18.5–24.9 is normal. The Asian standard (used in Korea, Japan, and China) is stricter: 18.5–22.9 is normal, 23–24.9 is overweight, and 25+ is obese.
BMI can be misleading for athletes (high muscle mass makes BMI appear high without excess fat), pregnant women, adults over 65, and growing children. Direct body fat measurement is more reliable in these cases.
Research shows Asian populations have higher body fat percentages and greater risk of metabolic diseases (diabetes, hypertension) at the same BMI compared to Western populations. Countries like South Korea, Japan, and China therefore apply lower thresholds.
A sustainable approach combines moderate calorie reduction with regular aerobic exercise. Aim for 0.5–1 kg of gradual weight loss per week rather than rapid changes. Always consult a doctor or dietitian before starting a weight-loss plan.