BMI Calculator
Calculate your Body Mass Index (BMI) from your height and weight in either metric or imperial units. BMI is a quick screening number that estimates whether your weight is in a healthy range for your height, and it is widely used as a first-pass health indicator. This calculator shows your exact BMI value plus the standard category (underweight, normal, overweight or obese) using the World Health Organization thresholds. Remember that BMI does not account for muscle mass or body composition, so athletes may read high; treat it as a rough guide, not a diagnosis. Enter your numbers and the result updates instantly, all computed locally in your browser.
How to use BMI Calculator
- Pick metric or imperial units.
- Enter your height and your weight.
- Read your BMI value and its weight category instantly.
Frequently asked questions
What formula does this BMI calculator use?
It uses the standard formula weight in kilograms divided by height in meters squared. Imperial inputs are converted to metric first, so the result matches the WHO definition.
What BMI counts as a healthy weight?
A BMI of 18.5 to 24.9 is the standard healthy range. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is in the obese category.
Does BMI account for muscle mass?
No. BMI only uses height and weight, so very muscular people can read as overweight even at low body fat. Treat it as a rough screening number, not a body composition measure.
What is BMI Calculator?
Calculate your Body Mass Index (BMI) from your height and weight in either metric or imperial units. BMI is a quick screening number that estimates whether your weight is in a healthy range for your height, and it is widely used as a first-pass health indicator.
Is BMI Calculator free to use?
Yes. BMI Calculator is completely free, with no sign-up and no usage limits.
Does BMI Calculator work in a web browser?
Yes. BMI Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with BMI Calculator?
Yes. BMI Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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