BMI Calculator
Calculate body mass index using height and weight.
Calculate body mass index using height and weight.
How to use BMI Calculator
Calculate body mass index using height and weight.
- Select the settings and calculation mode that match your task.
- Enter your own values in the labelled fields; use consistent units and dates.
- Calculate, review the breakdown and correct any flagged inputs before using the result.
Formula and calculation method
BMI = weight in kilograms ÷ height in metres squared. Adult BMI is a screening measure, not a diagnosis.
Use the result breakdown to check the inputs and understand which factors changed the outcome.
Check before using the result
Check input units, dates and the selected rule or policy. A valid mathematical calculation does not replace the applicable institution’s rules.
Frequently asked questions
How does BMI Calculator calculate the result?
BMI = weight in kilograms ÷ height in metres squared. Adult BMI is a screening measure, not a diagnosis.
Which settings should I use?
Choose the scale, dates, units and rule that match your records. Where a custom mode is provided, enter the values from your applicable policy instead of assuming the example preset applies.
Can I use the result for an official decision?
Use the result to plan and check your figures. Confirm official requirements, records or quotations with the relevant institution.