Based on Korean standards · Immediate results · Provides target weight BMI Calculator
Enter your height and weight to instantly check your BMI (Body Mass Index), obesity level, normal weight range, and target weight.
After entering height and weight
Calculate BMI Please press the button.
<18.5 normal
18.5~22.9 Overweight
23~24.9 obesity
25~
📋 BMI Reference Chart (Korean Standards from the Korean Society for the Study of Obesity)
| classification | BMI range | Status display | Health risk | Weight based on my height |
|---|---|---|---|---|
| underweight | Less than 18.5 | increase | — | |
| normal | 18.5 ~ 22.9 | commonly | — | |
| Overweight | 23 ~ 24.9 | Slight increase | — | |
| Stage 1 obesity | 25 ~ 29.9 | increase | — | |
| Stage 2 obesity | 30 ~ 34.9 | Altitude increase | — | |
| Stage 3 obesity | 35 or more | Very high altitude increase | — |
What is BMI?
BMI (Body Mass Index) is calculated by dividing weight (kg) by the square of height (m), and is an international standard indicator that allows for a convenient check for overweight and obesity. It was developed in 1832 by Belgian mathematician Adolphe Quetelet and is currently officially used by the WHO and the Korean Society for the Study of Obesity.
BMI Calculation Formula
Example: Height 170cm, Weight 65kg → 65 ÷ (1.70 × 1.70) = BMI 22.5
Korean BMI Standards (Korean Society for the Study of Obesity)
Asians and Koreans have different body compositions compared to Westerners, so even with the same BMI, they have higher body fat percentages and a higher risk of cardiovascular disease. For this reason, the Korean Society for the Study of Obesity uses stricter standards than Western criteria (overweight of 25 or higher).
- Underweight: BMI less than 18.5
- normal: BMI 18.5 ~ 22.9
- Overweight: BMI 23 ~ 24.9
- Stage 1 Obesity: BMI 25 ~ 29.9
- Stage 2 Obesity: BMI 30 ~ 34.9
- Stage 3 Obesity (Severe Obesity): BMI 35 or higher
Limitations of BMI
While BMI is a convenient indicator, it has the disadvantage of not reflecting muscle mass. Athletes with a lot of muscle mass may have low actual body fat even if their BMI is high. Conversely, individuals with "skinny fat"—those with low muscle mass and high body fat—may face health risks even if their BMI is normal.
Lifestyle habits for a normal BMI
- 150 minutes or more of aerobic exercise per week (brisk walking, swimming, cycling, etc.)
- Maintain muscle mass with strength training at least twice a week.
- Check daily calorie intake — Calorie calculator conjugation
- Understanding Basal Metabolic Rate — Basal Metabolic Rate Calculator conjugation
- Consume 1.5–2 liters of water per day and maintain 7–9 hours of sleep.