BMI Calculator: frequently asked questions
Straight answers to the questions people ask most about BMI and the BMI Calculator.
What does my BMI number mean?
The calculator sorts your BMI into standard WHO categories: under 18.5 is underweight, 18.5–24.9 is normal, 25–29.9 is overweight, and 30 and above is obese. These ranges are a screening guide, not a diagnosis.
How is BMI calculated?
BMI is your weight in kilograms divided by the square of your height in meters — BMI = weight (kg) / height (m)^2. The calculator does this for you, including unit conversion if you enter imperial values.
Does BMI work the same for men and women?
Yes. The formula and categories are the same regardless of sex. BMI is a rough population-level measure and does not distinguish muscle from fat.
Do I need to install or enter anything besides height and weight?
No installation and no account. Just type your height and weight, pick metric or imperial, and press Calculate.
Verdict
If you need a quick, reliable body mass index, the BMI Calculator does it in seconds with just two inputs.