Home Diabetes BMI Calculator – Check Your Body Mass Index (BMI)

BMI Calculator – Check Your Body Mass Index (BMI)

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The BMI (Body Mass Index) can be used to quickly and simply assess if someone is likely to be a healthy weight. It uses a person’s weight and height. This article discusses BMI in adults only.

Although BMI is a frequently used measure, that is straightforward to calculate, it can only provide an indication of whether someone is likely to be underweight, of normal weight, overweight or obese. BMI is perhaps best viewed as a helpful rough guide to your appropriate weight.

Using the BMI calculator

Calculate your BMI and type 2 diabetes risk by entering your height (in feet and inches) and weight (in either pounds or kilograms), and see if you are underweight, normal weight, overweight or obese.

Height

Enter your height in Feet and Inches using the two textboxes.

Weight

Enter your weight in either pounds or kilograms.

Using your BMI

BMI to weight (WHO)
BMI Meaning
Below 18.5 Underweight
18.5 to 24.9 Healthy weight
25 to 29.9 Above Overweight
30 and above Obese

Once you have calculated your BMI look at the table to determine which category you are in; underweight, healthy weight, overweight or obese.

This information can be helpful for a range of reasons, including a higher BMI is known to be associated with an increased risk of developing type 2 diabetes and other health conditions such as sleep apnoea. However conditions such as type 2 diabetes can also develop in people with a normal BMI. So it is important to remember that BMI is just an indicator of health.

BMI formula

The calculation for BMI was invented by Adolphe Quetelet, a Belgian mathematician born in 1796. He proposed that people’s weight could be classified relative to an ideal weight for their height.

To this day, Body Mass Index is also referred to as the Quetelet index.

BMI (kg/m 2 ) = mass (kg) / height (m) 2

BMI graph

BMI can also be determined using a chart that depicts BMI as a function of mass and height.

BMI chartBMI chart

Is BMI an accurate predictor of health?

Because of how BMI is calculated it cannot differentiate between weight from muscle and weight from body fat. Those with a high proportion of muscle (for example, athletes) may have a very high BMI, whilst having a lower amount of body fat.

Therefore in this group, a higher BMI is not a useful indication of their health status. Also, some critics argue that age should be taken into consideration when deciding on what BMI is healthy for a person. Most recently, waist-to-hip has been suggested as a better indicator of health than BMI.

You can read more about the argument against BMI.

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