Worked example
A person weighing 70 kg at 1.75 m has a BMI of about 22.9; BMI is a screening measure and not a diagnosis.
Health screening tool
BMI Calculator
Calculate adult body mass index from metric measurements. BMI is a general screening measure, not medical advice.
Enter your measurements to see the result.
Practical guidance
Use the BMI Calculator with confidence
Calculate body mass index and its screening category. Review the example and limitations below before using the result for an important decision.
Assumptions and limits
BMI is a population-level screening measure, not a diagnosis. It does not account for body composition, pregnancy, age-specific growth, or individual medical circumstances; discuss health concerns with a qualified clinician.
How to read the result
Calculations run from the values you enter using the formula described on this page. Inputs are processed in your browser and results are rounded for display.
Calculation methodology
Read our calculation methodology Educational estimate only. Verify regulated financial, tax, employment, or legal decisions with an official source or qualified professional.