Body Mass Index (BMI)

Units
Metric Imperial
Enter your height and weight.
10
18.5
25
30
35
40
50
UnderNormalOverOb-IOb-IIOb-III

BMI categories: <18.5 underweight, 18.5–24.9 normal, 25.0–29.9 overweight, 30.0–34.9 obesity I, 35.0–39.9 obesity II, ≥40 obesity III. BMI is a screening tool, not a diagnosis.

What this calculator does

This calculator estimates your Body Mass Index (BMI) from your height and weight. BMI is a simple screening number that helps categorize body size using a standard formula.

How the calculation works

You can enter values in metric or imperial units. The calculator converts units as needed and then computes BMI as weight divided by height squared. The result is mapped to common BMI categories (underweight, normal, overweight, obesity).

How to interpret the result

BMI does not measure body fat directly and can be misleading for very muscular people, athletes, or certain body types. Use it as a starting point, not a diagnosis, and consult a healthcare professional for personal guidance.