About this tool
Calculate body mass index (BMI) from weight in kilograms and height in metres. BMI is a screening measure, not a diagnosis. This page explains the values requested and the method used so you can check whether the result fits your purpose.
How to use it
Enter Weight and Height.
Press Calculate, then review the result and the method below. Use Reset to clear the values in the calculator panel.
Method used
BMI = weight in kg ÷ height in metres².
Important assumptions and limits
BMI does not diagnose health conditions and may not be suitable for every person. Seek professional advice for individual health questions.
Health note: This is a general numerical estimate. It is not medical advice, a diagnosis or a substitute for care from a qualified clinician.
Questions about this result
Are the values I enter sent to The Decimal Space?
No. This calculator processes the values in your browser. This page does not require a calculator account or a server-side save function.
Can I use this for an important decision?
Check the inputs, units, formula and any rounding. For a decision with legal, tax, financial, medical, engineering or safety consequences, use an official source or obtain advice from an appropriately qualified professional.
Why might a result differ from another calculator?
Different tools can use different inputs, rounding, units, assumptions or formulas. Compare the calculation method rather than relying only on a displayed number.