BMI Calculator
(Healthy Weight Calculator)



What is BMI (Body Mass Index)?

BMI (Body Mass Index) is a calculation that uses your height and weight to figure out if you currently have a healthy weight for your height.

The below BMI calculator can be used to check the BMI of an adult. Please do not use this calculator for children or pregnant women, as their BMI is calculated differently.

Adult BMI Calculator

BMI Score Meaning

Below 18.5 = Underweight

Between 18.5 – 24.9 = Healthy weight

Between 25 – 29.9 = Overweight

Between 30 – 39.9 = Obese

Over 40 = Morbidly obese


Asian, Black & Middle Eastern BMI

People who have an asian and middle eastern ethnicity are more likely to develop certain long-term health conditions like diabetes. Their BMI ranges may therefore be slightly different.

People from these ethnic backgrounds have:

  • An increased risk of developing certain medical conditions if they have a BMI of 23 or above
  • A high risk of developing certain medical conditions if they have a BMI of 27.5 or above

How accurate is BMI?

Although the BMI calculation uses your weight to calculate if you are in a healthy weight range, it cannot tell if your weight is coming from your muscles, bones or any excess fat you have. The BMI also does not consider differences in age, gender and muscle mass.

This means that the BMI cannot accurately predict how much excess fat some people have. For example, very muscular people may show up as “overweight” on the BMI score even if they don’t have much excess fat. 

Despite this, calculating your BMI is a good starting point for assessing how healthy your weight is. If you have any concerns about your BMI or your weight, you should speak to your family doctor.

Other healthy weight calculations

There are some other calculations that you can use that may be able to give you a more accurate idea of your weight range such as measuring your:

  • Waist circumference
  • Waist to hip ratio
  • Waist to height ratio


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