BMI Calculator
Work out your body mass index from your height and weight in metric units. BMI gives a quick indication of whether your weight sits in a healthy range for your height.
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BMI is a rough screening measure that does not account for muscle mass, body composition or age. It is not a diagnosis. Speak to a healthcare professional for personalised advice.
Frequently asked questions
How is BMI calculated?
BMI is your weight in kilograms divided by the square of your height in metres. For example, a person who is 1.75 m tall and weighs 70 kg has a BMI of 70 divided by 3.0625, which is about 22.9.
What is a healthy BMI range?
For most adults, a BMI between 18.5 and 24.9 is considered a healthy weight. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above falls into the obese range.
Is BMI accurate for everyone?
BMI is a useful general guide but it has limits. It can overestimate body fat in very muscular people and underestimate it in older adults who have lost muscle. Use it as a starting point, not a final verdict.