BMI Calculator
Calculate BMI from height and weight, with adult screening categories and their limitations.
Your estimate
Enter your values and calculate. Results will appear here.
BMI is a screening ratio, not a diagnosis or a direct body-fat measurement.
How to use this calculator
Enter height and weight using the matching unit controls. Adult categories here apply from age 20.
Formula and methodology
BMI = kg ÷ height in metres².
Worked example
70 kg at 1.75 m gives 22.9 after rounding. Category boundaries use the unrounded BMI.
What the result means
BMI is a screening ratio, not a diagnosis or a direct body-fat measurement.
Limitations
It does not distinguish muscle from fat and is not intended for children or pregnancy.
Common mistakes
Do not interpret category names as a complete health assessment.
Frequently asked questions
Does BMI measure body fat?
No. It uses only height and weight.