BMI Calculator
Enter your height and weight to instantly calculate your BMI (Body Mass Index) and see your classification based on WHO and Korean obesity standards.
Your BMI
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BMI Classification Table (Korean Obesity Society)
| Classification | BMI Range |
|---|---|
| Underweight | Below 18.5 |
| Normal | 18.5 – 22.9 |
| Overweight | 23.0 – 24.9 |
| Obese Class I | 25.0 – 29.9 |
| Obese Class II | 30.0 – 34.9 |
| Obese Class III | 35.0 and above |
The first step to managing your health is knowing your Body Mass Index. BMI (Body Mass Index) is calculated by dividing your weight in kilograms by the square of your height in meters. It is an internationally recognized standard used by the World Health Organization (WHO) and the Korean Society for the Study of Obesity to assess obesity levels. This tool instantly calculates your BMI from just your height and weight, and displays a classification result based on Korean/Asian standards with color-coded indicators.
Key Features
Instant BMI Calculation
Enter your height (cm) and weight (kg), click one button, and your BMI is displayed to one decimal place. No need to manually work through the formula — get your result immediately.
Korean/Asian BMI Standards
The WHO international standard sets the overweight threshold at BMI 25, but Asians face higher risks of abdominal obesity and metabolic diseases at the same BMI levels. This tool applies the Korean Society for the Study of Obesity standard (overweight at BMI 23 and above) for more accurate classification.
Color-Coded Classification
Results are color-coded for instant visual understanding: Underweight (blue), Normal (green), Overweight (yellow), Obese Class I (orange), Obese Class II (red), and Obese Class III (dark red).
Healthy Weight Range
Based on your entered height, the tool also calculates and displays the healthy weight range corresponding to a BMI of 18.5 to 22.9.
How to Use
Step 1: Enter Height
Enter your height in centimeters in the height (cm) input field. For example, if you are 170cm tall, enter 170.
Step 2: Enter Weight
Enter your weight in kilograms in the weight (kg) input field. For example, if you weigh 65kg, enter 65.
Step 3: Check Results
Click the Calculate button to instantly see your BMI value, classification, and healthy weight range for your height. You can also press Enter to calculate.
Tips
Understand BMI Limitations
BMI is a convenient and useful indicator, but it does not account for muscle mass, body fat distribution, or bone density. Athletes with high muscle mass or elderly individuals may see results that differ from their actual health status.
Measure Waist Circumference Too
Abdominal obesity can be more accurately assessed with waist circumference than BMI alone. A waist circumference above 90cm for men or 85cm for women indicates abdominal obesity.
Check Regularly
Body weight fluctuates with seasons, diet, and exercise habits. Checking your BMI about once a month can help you stay on track with weight management.
Frequently Asked Questions
What is BMI?
BMI (Body Mass Index) is calculated by dividing weight (kg) by the square of height (m). It is an internationally recognized indicator for assessing obesity levels.
Are Korean BMI standards different from WHO standards?
Yes, the Korean Society for the Study of Obesity sets the overweight threshold at BMI 23, reflecting Asian body composition characteristics. This is lower than the WHO international standard of 25.
Can BMI alone determine health status?
BMI is a convenient indicator for assessing obesity, but factors like muscle mass, body fat percentage, and waist circumference should also be considered for an accurate health assessment.
Can a muscular person have a high BMI?
Yes, since BMI is calculated solely from weight and height, muscular athletes may show high BMI values despite not being obese. In such cases, body fat percentage measurement is recommended.