BMI – Body Mass Index

BMI stands for body mass index, a method of measuring a whether a person is at a healthy weight or not. It is entirely based upon the simple ration of height to weight. This BMI calculator is for adults, 18 and older. For adolescents and children, click here.

BMI Calculator

BMI Calculator

Result’s Chart – Standard (U.S.)

BMI Category
under 18.5Underweight
18.5 – 24.9Normal
25 – 29.9Overweight
30 and upObesity

Result’s Chart – Metric

Metric BMI CategoryClassificationsRisk
< 18.5Underweight
18.5 – 24.9Normal
25.0 – 29.9OverweightIncreased
30.0 – 34.9ObeseObesity Class IHigh
35.0 – 39.9ObeseObesity Class IIVery high
≥ 40.0Extremely obeseObesity Class IIIExtremely high

These figures only give an adult a rough estimate of their weight health. It does not take into account the amount of “muscle weight” or their waist circumference, both very relevant factors. The BMI does not account for age or gender either.