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The free Body Mass Index calculator, also known as BMI, computes and classifies BMI for children and adults using data obtained from WHO and CDC.
Body Mass Index
|Body Mass Index (BMI)||24.2 kg/m2|
|BMI Category||Healthy weight|
|Healthy BMI range||18.5 kg/m2 - 25 kg/m2|
|Healthy weight for the height||135.1 lbs - 182.6 lbs|
|Gain to reach a BMI of 18.5 kg/m2||-|
|Lose to reach a BMI of 25 kg/m2||-|
|Ponderal Index||13.27 kg/m3|
There was an error with your calculation.
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You can use the Body Mass Index (BMI) calculator to compute your BMI value and the corresponding weight status based on your age. The calculator uses the metric system of units in the "Metric Units" tab by default. You can select the U.S. system of units on the “US Units” tab or use the unit converter on the “Other Units” tab. The Ponderal Index is computed together with the BMI.
BMI measures an individual’s degree of fatness or leanness regarding weight and height. It can also provide information about the tissue mass in a person’s body. You can use it to assess the proportionality of the weight-to-height ratio.
The results of a BMI calculation determine whether a person is obese, overweight, average weight, or underweight. BMI ranges are sometimes broken down into subgroups, such as very underweight or seriously obese. These BMI ranges vary by factors such as region and age.
Obesity or malnutrition can have severe consequences on one’s health. And while BMI is an imperfect indicator of healthy body weight, it is a helpful indicator of whether additional testing or action is needed. For further information on BMI classifications and calculations, see the table below.
This body weight classification is recommended by the World Health Organization (WHO). It is based on BMI values for adults (18+).
|Category||BMI range - kg/m2|
|Severe Thinness||< 16|
|Moderate Thinness||16 - 17|
|Mild Thinness||17 - 18.5|
|Normal||18.5 - 25|
|Overweight||25 - 30|
|Obese Class I||30 - 35|
|Obese Class II||35 - 40|
|Obese Class III||> 40|
This graph shows the different BMI classifications based on statistics from the World Health Organization. The solid lines show major subdivisions, while the dashed lines represent minor subdivisions.
The CDC (Centers for Disease Control and Prevention) recommends using BMI to assess the health of children and adolescents aged two to twenty.
|Healthy weight||5% - 85%|
|At risk of overweight||85% - 95%|
The CDC has created graphics showing a rise in BMI regarding age percentile growth.
Obesity raises the chance of significant health issues, and the Centers for Disease Control and Prevention lists the following risk factors:
Being overweight may have several adverse and sometimes devastating effects on the body. Hence, it is essential to have a BMI score below 25 kg/m², which shows a healthy weight. However, it is advisable to consult a physician to determine if any lifestyle changes are necessary to maintain better health.
Risk factors associated with being underweight include:
Weight loss may indicate a more serious underlying disease or illness with its risks, as seen in anorexia nervosa. If you suspect that you or your acquaintances are struggling with weight for unclear reasons, consult a doctor.
Despite its extensive use as a reliable predictor of healthy body weight, the body mass index (BMI) has several limitations. These include not considering the entire body makeup. The diversity of body types and the distribution of fat, muscle, and bone mass make it necessary to use BMI with other indicators.
Online calculators provide a general estimate of BMI based on height and weight, but they don't account for specific factors that can influence its accuracy. BMI doesn't differentiate between weight from muscle and weight from fat, so it's not a direct measure of body fat. Additionally, various factors, such as age, gender, muscle mass, levels of exercise, and others, can influence BMI readings and their interpretations.
Let’s take the example of a passive older person who sits or lies down most of his life. He has a significant excess fat, but he is not overweight overall. In terms of objective health, this person may not be relatively healthy, but in terms of BMI, he might be normal.
The opposite is true of bodybuilders, who have powerful muscles. Muscle is heavier than fat, yet it takes up less volume. Regarding BMI, many bodybuilders may be either near the upper limit of normal weight or be considered overweight. At the same time, they will be in excellent health. A person can look more trim and still be heavier with a solid body mass.
CDC (Centers for Disease Control and Prevention) data shows that:
The same variables responsible for limiting the efficacy of BMI in adults also apply to adolescents and even children. Height and the level of sexual development may influence the BMI and body fat percentage.
In obese children, BMI is a stronger predictor of excess body fat than in overweight children. Their BMI can be caused by a high fat- or fat-free mass (all body components other than fat, such as water, organs, muscle, and so on). In lean children, the difference in BMI may also be due to fat-free mass.
For the general population, BMI can be a useful indicator for potential health risks associated with being underweight, overweight, or obese. However, due to its limitations, BMI should be used as one of several tools for assessing an individual's health and body weight, always in conjunction with other assessments and personalized health evaluations.
Below are the equations used to calculate BMI in the International System of Units (SI) and the United States General System (USC). They use a person who is 5 feet 10 inches tall and weighs 160 pounds as an example.
SI, Metric Units:
The Ponderal Index (PI) examines a person’s adiposity proportionally to weight and height. The main difference between the BMI and the Ponderal Index is that the Ponderal Index formula (below) places measurements in the cube, not the square.
Although BMI can be a useful tool when studying large populations, it is not reliable for determining thinness or obesity in individuals. PI is more reliable when used on very short or tall people. The BMI is more likely to identify unusually high or low quantities of body fat in people with extreme weight and height measurements.
Below is the equation for calculating a person's Ponderal Index. It uses a 5 feet 10 inches tall, 160 pound person as an example:
SI, Metric Units: