BMI Calculator: A Simple Table to Keep You Motivated in Lowering Your Body Mass Index

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The actual calculation is your weight in kilograms divided by your height in metres squared but it's also easy to read on the chart. BMI can be divided into several categories and generally the higher your BMI, the greater your risk of a large range of medical problems. Inaccuracies can also occur if you're an athlete or very muscular as this can give you a higher BMI even if you have a healthy level of body fat and this BMI chart is not appropriate for women who are pregnant or breastfeeding, or people who are very frail.

As BMI is based on weight and height, by losing weight you will reduce your BMI and put yourself into a lower risk group.

Body mass index - Wikipedia

A healthy diet, including a balance of food groups, vitamins and minerals, is essential for a long and active life. Many studies have shown that, to slowly and steadily lose weight, any diet which includes a healthy balance will work if you're motivated. All content within BBC Health is provided for general information only, and should not be treated as a substitute for the medical advice of your own doctor or any other health care professional.

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Calculate BMI

This general correlation is particularly useful for consensus data regarding obesity or various other conditions because it can be used to build a semi-accurate representation from which a solution can be stipulated, or the RDA for a group can be calculated. Similarly, this is becoming more and more pertinent to the growth of children, due to the fact that the majority of children are sedentary.

Smaller effects are seen in prospective cohort studies which lend to support active mobility as a means to prevent a further increase in BMI. BMI categories are generally regarded as a satisfactory tool for measuring whether sedentary individuals are underweight , overweight , or obese with various exceptions, such as: The medical establishment [35] and statistical community [36] have both highlighted the limitations of BMI.

Body mass index

Mathematician Keith Devlin and the restaurant industry association Center for Consumer Freedom argue that the error in the BMI is significant and so pervasive that it is not generally useful in evaluation of health. The exponent in the denominator of the formula for BMI is arbitrary. The BMI depends upon weight and the square of height.

Since mass increases to the 3rd power of linear dimensions, taller individuals with exactly the same body shape and relative composition have a larger BMI. So short people are misled into thinking that they are thinner than they are, and tall people are misled into thinking they are fatter. For US adults, exponent estimates range from 1. In other words, persons with small frames would be carrying more fat than optimal, but their BMI reflects that they are normal. Conversely, large framed or tall individuals may be quite healthy, with a fairly low body fat percentage, but be classified as overweight by BMI.

Accurate frame size calculators use several measurements wrist circumference, elbow width, neck circumference and others to determine what category an individual falls into for a given height. In this situation, BMI will increase without any corresponding increase in weight.

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Assumptions about the distribution between muscle mass and fat mass are inexact. BMI generally overestimates adiposity on those with more lean body mass e. A study in June by Romero-Corral et al. It is not clear where on the BMI scale the threshold for overweight and obese should be set. Because of this the standards have varied over the past few decades. Between and the U. Dietary Guidelines have defined overweight at a variety of levels ranging from a BMI of This became the definitive guide for determining if someone is overweight.

The current WHO and NIH ranges of normal weights are proved to be associated with decreased risks of some diseases such as diabetes type II; however using the same range of BMI for men and women is considered arbitrary, and makes the definition of underweight quite unsuitable for men. One study found that the vast majority of people labelled 'overweight' and 'obese' according to current definitions do not in fact face any meaningful increased risk for early death. In a quantitative analysis of a number of studies, involving more than , men and women, the lowest mortality rates were found for people with BMIs between 23 and 29; most of the 25—30 range considered 'overweight' was not associated with higher risk.

A study published by Journal of the American Medical Association JAMA in showed that overweight people had a death rate similar to normal weight people as defined by BMI, while underweight and obese people had a higher death rate.

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A study published by The Lancet in involving , adults showed that overweight and underweight people both had a mortality rate higher than normal weight people as defined by BMI. The optimal BMI was found to be in the range of In an analysis of 40 studies involving , people, patients with coronary artery disease with normal BMIs were at higher risk of death from cardiovascular disease than people whose BMIs put them in the overweight range BMI 25— One study found that BMI had a good general correlation with body fat percentage, and noted that obesity has overtaken smoking as the world's number one cause of death.

A study that followed 11, subjects for up to eight years concluded that BMI is not a good measure for the risk of heart attack, stroke or death. A better measure was found to be the waist-to-height ratio. BMI Prime is a dimensionless number independent of units. Individuals with BMI Prime less than 0. BMI Prime is useful clinically because it shows by what ratio e.

Waist circumference is a good indicator of visceral fat , which poses more health risks than fat elsewhere. According to the U. Waist circumference can be a better indicator of obesity-related disease risk than BMI. For example, this is the case in populations of Asian descent and older people. Waist-to-hip circumference ratio has also been used, but has been found to be no better than waist circumference alone, and more complicated to measure. A related indicator is waist circumference divided by height.

The values indicating increased risk are: Within some medical contexts, such as familial amyloid polyneuropathy , serum albumin is factored in to produce a modified body mass index mBMI. From Wikipedia, the free encyclopedia. Body mass index Medical diagnostics A graph of body mass index as a function of body mass and body height.

The dashed lines represent subdivisions within a major class. Waist-to-height ratio and Waist-to-hip ratio. Archived from the original on