BMI Calculator: Estimate Body Mass Index from Height and Weight
A BMI calculator divides weight by height squared to give a screening estimate. Enter consistent metric values and use the result as general information rather than a diagnosis.
Calculate body mass index
- Enter your weight in kilograms.
- Enter your height in centimeters.
- Select Calculate BMI to see the estimate.
- Check that you entered the correct units and decimal values.
- Discuss health concerns or interpretation with a qualified clinician.
BMI formula and interpretation
BMI is calculated as weight in kilograms divided by height in meters squared. A number alone does not measure body composition, fitness, nutrition status or overall health.
Who should not rely on this estimate
Adult BMI ranges may not be appropriate for children, pregnancy, some athletes, older adults or individual clinical assessment. This tool does not diagnose a condition or recommend treatment.
Frequently asked questions
Is BMI a medical diagnosis?
No. It is a screening estimate and cannot determine a person’s health on its own.
Why should I confirm the units?
Entering pounds as kilograms or centimeters as meters changes the result substantially. Use the labels shown by the calculator.
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