Calculators
BMI Calculator
Calculate body mass index (BMI) from weight in kilograms and height in centimeters.
Runs in your browser Your input never leaves your device.
About this tool
Enter weight in kilograms and height in centimeters to get your body mass index, a category, and the weight range that corresponds to a BMI of 18.5 to 24.9 at your height. BMI is weight divided by height in meters squared. Categories are below 18.5 underweight, 18.5 to under 25 normal weight, 25 to under 30 overweight, and 30 or more obese. The calculation runs in your browser as you type. BMI is a simple screening figure for adults; it does not consider muscle, age or build.
How to use it
- Enter your weight in kilograms.
- Enter your height in centimeters.
- Read the BMI, category and weight range.
Example
70 / (1.75 x 1.75) = 22.86, shown as 22.9.
Input
Weight 70 kg, Height 175 cm
Result
BMI: 22.9 Category: Normal weight Healthy weight range: 56.7 – 76.3 kg
Common problems
- No result
- Both weight and height must be greater than zero.
- Result looks far off
- Only metric units are accepted. Convert pounds to kilograms and feet and inches to centimeters first.
- Using it for children
- The categories are the fixed adult thresholds and are not adjusted for age. Ask a health professional about children.