BMI Calculator: The Complete Guide
Find your Body Mass Index in seconds. Enter your height and weight in metric or imperial units to see your BMI, which category it falls into, and the healthy weight range for your height.
Who the BMI Calculator is for
Anyone checking whether their weight is in a healthy range for their height as a quick screening step.
How to use the BMI Calculator
- Type your values into the fields above — pick your currency or units where the calculator offers them.
- Results update automatically as you type; there's no submit button and nothing is sent to a server.
- Adjust any input to compare scenarios, then copy the result with a single click.
How it works
BMI = weight (kg) ÷ height (m)². The standard categories are under 18.5 (underweight), 18.5–24.9 (normal), 25–29.9 (overweight), and 30 or more (obese).
Features
- Metric or imperial units
- BMI category
- Healthy weight range
- Instant result
What BMI does and doesn't tell you
Body Mass Index is a simple ratio of weight to height used to screen for underweight, healthy weight, and overweight at a population level. It's quick and useful, but it doesn't distinguish muscle from fat or account for frame and fat distribution — so very muscular people can read 'overweight' despite low body fat. Treat it as one signal, not a diagnosis.