BMI Calculator
Enter height in centimeters and weight in kilograms. The calculation runs in your browser and updates BMI, category and healthy weight range from the selected standard.
Measurement Utility
BMI Calculator
Enter your height and weight to calculate BMI, check your weight category, and estimate a healthy weight range. You can switch between Korean adult and WHO standards, making it easier to compare everyday wellness references without changing tools.
BMI Result
0.0
-
Enter your height and weight to calculate your BMI.
Weight Status
-
Reference weight band
-
Input
-
18.5
22.9
24.9
30+
Using the Korean adult reference.
BMI Classification
BMI category boundaries differ between Korean adult and WHO standards, so the selected standard affects the normal, overweight and obese ranges shown below.
Underweight
Below 18.5
Normal
18.5 ~ 22.9
Overweight
23.0 ~ 24.9
Obese
25.0 or higher
BMI Calculator
Calculate adult BMI from height and weight, compare the international and Korean reference categories, and understand the limits of this screening measure.
Who this helps
- Adults comparing BMI references
- Readers checking a height and weight calculation
When to use this tool
- Adult example
- Different categories
From input to a checked result
- 1
Enter height in centimetres.
- 2
Enter weight in kilograms.
- 3
Choose the international or Korean adult reference.
- 4
Calculate and check both BMI and the selected category.
- 5
Treat the weight band as a reference, then copy the result if needed.
Adult example
- Input
- 170 cm; 65 kg
- Result
- BMI 22.5
Both references place the unrounded value in the normal category.
Different categories
- Input
- 165 cm; 70 kg
- Result
- BMI 25.7
This is overweight in the international reference and obesity in the Korean reference.
How it works
BMI = weight in kg / height in metres squared. International thresholds are 18.5, 25 and 30; Korean thresholds are 18.5, 23 and 25. Categories use the unrounded value. The displayed reference weight band uses BMI 18.5–24.9 or 18.5–22.9 multiplied by height squared.
Limitations
- Adult screening only; children need age- and sex-specific growth references.
- Muscle mass, pregnancy and other conditions can make BMI less informative.
- The weight band is not an individual weight-loss or weight-gain target.
- Accepts 50–250 cm and 10–300 kg; input limits do not establish clinical suitability.
Your data
The tool calculates in this browser without storing height or weight. Copied results include these measurements.
References
Related tools
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Convert cm to inches, kg to pounds, Celsius to Fahrenheit and more. Compare all units, US volume definitions and base-1024 KiB, MiB and GiB data sizes.
- Age Calculator
Calculate full age, year difference, Korean counting age and days to your next birthday. Check birthday examples, leap-day handling and shared-date privacy.
Frequently asked questions
Why can a rounded BMI look like a boundary?
A value of 24.96 displays as 25.0 but remains below 25 before rounding. Classification uses the unrounded result.
Which reference opens by default?
English, Japanese and Chinese open the international reference; Korean opens the Korean adult reference. You can change it.
Does normal BMI establish good health?
No. BMI does not assess body composition, blood pressure or other individual risk factors.