What is BMI (Body Mass Index)?

BMI (Body Mass Index) is a value obtained by dividing body weight (kg) by the square of height (m). It is an internationally recognized indicator for assessing obesity. Formula: BMI = Weight (kg) / Height (m)^2

What is the normal BMI range based on Asian-Pacific criteria?

Based on Asia-Pacific criteria, BMI 18.5-22.9 is normal, 23-24.9 is overweight (pre-obese), 25-29.9 is obese class 1, 30-34.9 is obese class 2, and 35 or above is obese class 3. These criteria differ from standard WHO criteria and apply the Asia-Pacific standard.

How is the ideal (standard) weight calculated?

Standard weight is calculated based on BMI 22. Standard weight (kg) = 22 x Height (m)^2. The normal weight range is the weight corresponding to BMI 18.5-22.9.

BMI Calculator - Body Mass Index & Obesity Assessment

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Enter Body Information

Height (cm)

Weight (kg)

* This calculator applies Asia-Pacific obesity criteria (used by the Korean Society for the Study of Obesity).
BMI is applicable for adults (18 years and older). Results may differ from actual obesity levels for individuals with high muscle mass.

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BMI Calculation Results

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Underweight Normal Overweight Obese 1 Obese 2 Obese 3

10 18.5 23 25 30 35 40+

Standard Weight (BMI 22)
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Normal Weight Range

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Difference from Current Weight

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Obesity Rate

Category	BMI Range	Assessment
Underweight	Below 18.5	Insufficient weight
Normal	18.5 ~ 22.9	Healthy weight
Overweight (Pre-obese)	23.0 ~ 24.9	Caution needed
Obese Class 1	25.0 ~ 29.9	Weight management needed
Obese Class 2	30.0 ~ 34.9	Active management needed
Obese Class 3 (Morbid Obesity)	35.0 and above	Professional consultation recommended