Calculate Your Body Mass Index

BMI Calculator

The BMI (body mass index) is a measurement of your healthy weightfor your height. Make use of the BMI calculator to determine all the adult members of your household.

For children, visit Weight Concern's Child and Young people's Body Mass Index (BMI) Calculator. Imperial

This calculator is only to be employed for adults (pregnant or lactating women shouldn't rely upon these BMI readings) however, no action should be made based on its results other than consulting an appropriately qualified professional like a doctor.

The calculator will give you an some idea of how your weight is compared to typical values. Body Mass Index (or BMI) is calculated by taking the weight of your body (in kg) multiplied by your height (in meters) or BMI = Kg/M2.

Is Body Mass Index reliable?

Your BMI is also known as Body Mass Index, is an indicator of your weight in relation to your height. The accuracy of your assessment of obesity is crucial, since being obese or overweight significantly increases the risk of developing a range of health conditions, including type 2 heart disease, diabetes and cancer. As the levels of obesity or obesity rise the spotlight has been placed upon BMI and its flaws as a gauge of the ideal weight for an individual instead of a whole population of people for whom "averages" are used.

"Some people naturally have a larger frame than others. But this causes quite a small variation in weight and is accounted for in the range of healthy BMI. There is really no such thing as someone who is big-boned. " Dr. Jan Sambrook, How to lose weight in a healthy way

For the majority of adult people, BMI provides a reliable estimation of your health risk. If your BMI is higher than 35, you are certainly putting your health at risk regardless of the other factors below. There are however some circumstances where BMI could underestimate or overestimate the risk in the 25-35 BMI range. The most common are:

Children

Your doctor or health visitor can provide advice on the position of your child on the "centile charts" that are used to determine the weights that are healthy for children.

Women who are pregnant

Usual BMI estimates do not apply if you're pregnant.

If you're very strong

BMI is based on the assumption that you are carrying an adequate amount of fat in your body, including abdominal fat - the fat that is located in your stomach cavity, not under your skin. The abdominal fat is more strongly linked to the risk of type 2 heart disease and diabetes than skin fat.

If you're extremely muscular the amount of body fat could be lower than what is predicted by your BMI. This is only applicable to those who perform intense exercise significantly more than the average.

If you're of Asian origin, you are of Asian

People who are of Asian origin are more prone to accumulate abdominal fat (fat in the stomach cavity, not beneath your skin) with lower BMI levels than those who are of Caucasian origin. The people who have this type in weight loss are referred to as 'apples' instead of "pears" from their body outline. The health risks increase with a lower BMI due to the fact that abdominal fat is directly associated with the development of heart disease and Type 2 Diabetes.

The World Health Organisation has looked at the evidence, and because of the differences between Asian populations the organisation hasn't changed the cut-offs. However, it has recommended that , for the sake of public health certain Asian populations should be classified as overweight when their BMI is between 22 and 25 or obese with BMIs of 26-31.

People who are older (over 65, and possibly even over 60)

Since muscle mass tends to decrease and body fat tends to increase in people who are older The BMI might not be an accurate indicator of body fat, especially if you're older than 60.

Alternative estimates of health-related weight risk

If you think that your BMI might not accurately indicate whether you're overweight or obese taking a look at your abdominal circumference, waist-hip , or waist-height ratio could give you an accurate estimate.

Waist circumference

The waist circumference is measured halfway between the bottom of your ribcage to those on the hips' top, using a tape measure that is in line with the floor. It is essential to breathe out while you take measurements. Male

  • Health risk increased - > 94cm
  • Health risk for high-risk patients - > 102cm

Female

  • Health risk increased - >80cm
  • Health risk for high-risk people - > 88cm

Ratio of hip to waist

To determine your waist to hip ratio, take a measurement of the circumference of your waist (as above) and your hip measurement at the broadest point on your hips. Divide the circumference of your abdomen by your hip measurement to get an approximate ratio.

  • For women, a waist-to- hip ratio of more that 0.85 is associated with a higher than the average risk.
  • For men the waist-to-hip ratio of more that 1.00 is associated with a higher than the average risk.

Ratio of waist to height

A recent study that compared BMI and waist circumference with hip-to-waist ratio, and the waist-to-height ratio discovered that the most reliable method to determine your body fat content was the waist-height ratio.

Take your waist circumference measurements as above, and then divide it by your height . clearly both measurements must at least be imperial (inches) or the metric (cm).

The definition of obesity for the whole body is by a waist-to-height ratio of:

  • 0.53 and more males
  • 0.54 and more in women

Abdominal obesity is defined as the waist-to-height ratio of 0.59 or greater.

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