Your doctor will need to evaluate your diet, how much exercise you get, your family history of disease and many other factors before determining the next step for you. For example, healthy athletes may weigh more than other people of the same height because they have well-developed muscles muscle tissue is denser than fat tissue, so a particular volume of muscle will weigh more than the same volume of fat. But a high BMI isn’t enough information to determine a course of action. Your physician can use your BMI to help determine if you have a weight problem. The body mass index range for adults 20 and over is shown here: BMI If you don’t want to do the math, use the handy calculator below. and your height is 5’6″ (66″), then the calculation is: (170 ÷ 66 2) x 703 = 27.4įor example, if your weight is 75 kg and your height is 162 cm (1.62 m), then the calculation is: 75 ÷ 1.62 2 = 28.6 (pounds of weight / 2) x 703įor example, if your weight is 170 lbs. BMI is a formula that calculates the ratio between height and weight: How do we measure obesity? Body mass index (BMI) is a good indicator, because it correlates pretty well with the amount of body fat a person has. These aforementioned methods are all rather expensive and require a lot of equipment to complete, but, of course, they are much more accurate.Measuring Obesity with the Body Mass Index For women, the ideal weight calculator uses the following equations: Robinson formula: 49 kg + 1.7 kg per every inch over 5 feet Miller formula: 53.1 kg + 1.36 kg per every inch over 5 feet Hamwi formula: 45.5 kg + 2. These methods include underwater weighing, dual-energy x-ray absorptiometry, isotope dilution, and BOD POD. Lorentz formula: (height cm - 100) - (height cm - 150)/4. Other popular methods are usually done on high-level athletes and in clinical settings. If you are worried about your BMI or are trying to lose weight, talk to your primary care doctor. Note that these are approximate values, and they are intended to be used only as a rough guide. Having a BMI higher than 24.9 may mean you are overweight. The idea behind its function is that electricity travels through muscle mass and body fat differently, so we can see the impedance the body has for the electricity measured with the scale/device.īoth of these two methods discussed are popular and rather easy and inexpensive to do, but the skinfold measure does require some level of expertise and practice with the use of the caliper. Use the tool on this page to calculate your BMI. This BIA method estimates body composition through an electric current flowing through the body. The typical formula used is a 3 site skinfold measurement known as the Jackson and Pollock Protocol.Īll you need for these measures to be done is a skinfold caliper, the proper formulas, and some expertise in doing the process.Īnd the other popular way to measure body composition is through the use of bioelectrical impedance, or BIA. Skinfold measures are done with a caliper to find the thickness of fat deposits under the skin in specific areas depending on your sex, race, and physical activity status. Two of the popular ways that are currently done in gyms would be skinfold measurements and bioelectrical impedance. There are many popular options for finding body composition in gyms and clinical settings. Since BMI may not be the best indicator for Body Composition, there must be better ones out there, right? The accuracy of BMI is higher when the BMI is high, and when there is a healthy BMI, it varies somewhat on other factors. This backs up the fact that BMI is excellent for screening, but on its own it has some problems regarding overall health judgments. Some other factors to consider regarding the accuracy of BMI are the differences in averages for both sexes and their retention of fat, along with the difference in race and age. We typically see more weight held in the waist area when someone is unhealthy. This would allow the measure to consider where the weight is held in the body. If we wanted to make BMI a little more accurate, we would use a model with waist size factored into the calculation. This happens because BMI is simple and doesn’t use any measurements to show how the body is composed. When someone has excessive muscle mass or has undergone significant weight loss, this could show them as unhealthy in either the low weight status or overweight and obese for populations like bodybuilders. The BMI will be distorted one way or the other. This typically means for athletes and those who train often. It is extremely accurate for the general population, but it is not without limitations.īMI is not extremely accurate for either extreme of the spectrum where someone has excessive amounts of muscle mass or is extremely lean. BMI is an easy and inexpensive option for screening, and it should primarily be used for that alone and not focused on too intensely.
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