Check Your BMI
Body Mass Index (BMI) is a simple measure that uses your height and weight to work out if your weight is healthy.
Enter your details to see your calculated BMI score here.
* BMI is a useful indicator based on height and weight, but it does not account for muscle mass or overall body composition.
What does my BMI mean?
- Below 18.5:Underweight. You may need to gain some weight. You are recommended to ask your doctor or a dietitian for advice.
- 18.5 - 24.9:Healthy Weight. You are at a healthy weight for your height. By maintaining a healthy weight, you lower your risk of developing serious health problems.
- 25.0 - 29.9:Overweight. You are slightly overweight. You may be advised to lose some weight for health reasons.
- 30.0 & Above:Obese. You are heavily overweight. Your health may be at risk if you do not lose weight.
Frequently Asked Questions
How is BMI calculated?
BMI is your weight in kilograms divided by the square of your height in metres (kg/m²). In imperial units it's your weight in pounds divided by your height in inches squared, multiplied by 703.
What is a healthy BMI range?
For most adults a BMI of 18.5–24.9 is classed as the healthy range, 25–29.9 as overweight, and 30 or above as obese. Below 18.5 is classed as underweight.
Is BMI accurate for everyone?
No. BMI is a quick screening tool, not a body-fat measurement. It can overestimate body fat in very muscular people and underestimate it in older adults with less muscle, and it isn't interpreted the same way for children or during pregnancy. Treat it as a rough guide, not a diagnosis.