Metric BMI is weight in kilograms divided by height in metres squared. Imperial BMI is weight in pounds divided by height in inches squared, multiplied by 703.
Calculator
BMI Calculator for Adults
Estimate adult Body Mass Index from height and weight using metric or imperial units. BMI is a screening measure and does not diagnose health conditions.
- Instant results
- Mobile friendly
- Free to use
Adult screening tool
Calculate BMI
Choose units, enter height and weight, then calculate the screening value.
Your BMI——
Adult screening categories: under 18.5, 18.5–24.9, 25–29.9, and 30 or above.
Simple instructions
How to use the BMI Calculator
Follow these steps to get a clear result.
- 1
Select metric or imperial units.
- 2
Enter an adult weight and height.
- 3
Select Calculate BMI.
- 4
Read the result together with the screening-category explanation and limitations.
Frequently asked questions
BMI Calculator FAQ
No. BMI is a screening measure and should be considered with other health information by a qualified professional.
No. Children and teenagers require age- and sex-specific growth references rather than fixed adult BMI categories.
