BMI Calculator
BMI is a screening measure, not a diagnosis.
BMI = weight in kg ÷ height in meters²
Calculate adult body mass index from weight and height.
Formula
BMI = weight in kg ÷ height in meters²
Worked example
Weight: 70 kg
Height: 175 cm
With these inputs, the result is 22.8571429 kg/m². BMI is a screening measure, not a diagnosis.
How to use this calculator
- Identify the quantity you want to calculate.
- Enter your measurements in the units shown on each field.
- Read the result, which updates as you change the inputs.
- Check the assumptions below before applying the result.
Assumptions and limits
Does not classify children, diagnose health, or account for pregnancy or body composition.
Precision and checking
Results are rounded for display. Use the most accurate measurements available, and avoid rounding your inputs unnecessarily. Extra decimal places in a result do not make an estimate more reliable.
To check a result, substitute the same input values into the formula shown above. Change one value at a time to understand how the quantity responds.
Frequently asked questions
What assumptions does this calculation use?
Does not classify children, diagnose health, or account for pregnancy or body composition.
Are my inputs sent to a server?
No. The calculation runs locally in your browser. The result updates as you edit the inputs.
Sources & references
- About Body Mass Index — Centers for Disease Control and Prevention
