Body mass index
Fitness / FREE CALCULATOR
Calculate adult BMI as a screening measure; it is not a diagnosis and is unsuitable for children or pregnancy.
Your answer starts here.
Enter your values and select Calculate to see the result and any available breakdown.
How to use this calculator
- Enter weight (kg). Use the unit shown beside the field.
- Enter height (cm). Use the unit shown beside the field.
- Select Calculate and review the result. Select Reset to restore the example inputs.
How the calculation works
BMI = weight/(height/100)^2.
Worked example
Entering 80 and 200 gives a primary result of 20.
Understand your result
Use this result together with the worked example and the assumptions below. Calculate adult BMI as a screening measure; it is not a diagnosis and is unsuitable for children or pregnancy.
Assumptions and limitations
Calculate adult BMI as a screening measure; it is not a diagnosis and is unsuitable for children or pregnancy. Check units and assumptions before using the result in a decision. Results are rounded for display.
Questions about this tool
What does this tool calculate?
Calculate adult BMI as a screening measure; it is not a diagnosis and is unsuitable for children or pregnancy.
What should I check before using the answer?
Calculate adult BMI as a screening measure; it is not a diagnosis and is unsuitable for children or pregnancy. Check units and assumptions before using the result in a decision.
Related guides
Guides will appear here when published and linked by the editor.