BMI Calculator
Calculate your Body Mass Index from height and weight (metric or imperial) and see your healthy weight category.
Input
Enter height and weight to calculate your BMI.
The BMI Calculator works out your body mass index from your height and weight, in either metric or imperial units. BMI is a quick screening number that places you in a weight category, so it is handy when you want a rough sense of whether your weight sits in a healthy range for your height.
How to use the BMI Calculator
- Choose metric (cm and kg) or imperial (feet/inches and pounds) units.
- Enter your height in the selected unit.
- Enter your current weight.
- Read your BMI value and the matching weight category.
Frequently asked questions
- How is BMI calculated?
- BMI equals your weight in kilograms divided by the square of your height in metres (BMI = kg / m^2). For example, a person who is 1.75 m tall and weighs 70 kg has a BMI of 70 / (1.75 x 1.75) = 22.9.
- What do the BMI categories mean?
- Using the common adult ranges, below 18.5 is underweight, 18.5 to 24.9 is a healthy weight, 25 to 29.9 is overweight, and 30 or above is in the obese range.
- Does BMI work for everyone?
- BMI does not separate muscle from fat, so very muscular people may read as overweight even when they are lean, and it is not designed for children, pregnant people, or the elderly without adjustment.
- Is this BMI result medical advice?
- No. This result is an estimate for general information only and is not medical advice, so please consult a doctor or other qualified professional about your weight and health.