BMI Calculator
Calculate your Body Mass Index from height and weight.
About this tool
ToolAlto's BMI Calculator uses weight in kilograms and height in centimeters to calculate BMI.
For the formula, worked examples, and important limitations of BMI, read How to Calculate BMI.
How to use it
- Enter your weight in kilograms.
- Enter your height in centimeters.
- Click Calculate BMI.
BMI formula
BMI is calculated by dividing weight in kilograms by height in meters squared:
BMI = weight ÷ (height × height)
For example, a person weighing 70 kg and measuring 1.75 m has a BMI of about 22.9. The result is a screening measure, not a diagnosis.
Understanding BMI
BMI can be used as one general indicator when discussing body weight, but it does not directly measure body fat, muscle mass, fitness, or overall health. Interpretation can also differ by age, sex, pregnancy status, and other factors.
Frequently asked questions
What is BMI?
BMI is a screening measure calculated from weight and height. It does not directly measure body fat or provide a diagnosis.
Is this medical advice?
No. This calculator provides general information only and should not replace advice from a qualified healthcare professional.