Understanding BMI
Body Mass Index (BMI) is a simple measure that uses your height and weight to estimate whether you're in a healthy weight range. It's widely used as a quick screening tool by doctors and health organisations worldwide.
How BMI is calculated
BMI = weight (kg) / height (m)²
Enter metric or imperial units above - we convert automatically and show your BMI along with the healthy weight range for your height.
BMI categories
- Below 18.5 - Underweight
- 18.5 – 24.9 - Normal (healthy) weight
- 25.0 – 29.9 - Overweight
- 30.0 and above - Obese
A note on accuracy
BMI doesn't distinguish between muscle and fat, so very muscular people may read as "overweight" despite being healthy. Use BMI as a general guide and consult a healthcare professional for personalised advice.