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This article was co-written by Claudia Carberry, RD, MS. Claudia Carberry is a licensed dietitian specializing in kidney transplantation and counseling for weight loss patients at the University of Arkansas for Medical Sciences. She is a member of the Arkansas Academy of Nutrition and Dietetics. Claudia received her MS in Nutrition from the University of Tennessee Knoxville in 2010.
There are 8 references cited in this article that you can see at the bottom of the page.
This article has been viewed 80,984 times.
Body fat percentage is your body fat mass divided by your total body weight (muscle, bone, water, etc.). Body fat percentage can be a pretty good indicator of some disease risk. For example, the higher the ratio (especially the fat around the abdomen), the greater the risk of cardiovascular disease, diabetes, osteoarthritis, and certain types of cancer. [1] X Trusted Source National Heart, Lung, and Blood Institute Go to source There are now many different ways to calculate body fat percentage, ranging from the rather old traditional method (such as using a caliper) to the traditional method (such as using a caliper). High-tech body scanning method. You can calculate this rate yourself at home although the results may not be perfect but are quite accurate, but if you want the most accurate results, you must have it checked with expensive equipment and cared for by a professional. health performance.
Steps
Calculate body fat percentage at home
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Measure your waist with a tape measure. Relying on waist measurements with a tape measure also helps diagnose the risk of certain diseases (as mentioned above) associated with being overweight or obese. [2] X Trusted Source National Heart, Lung, and Blood Institute Go to Source More specifically, if most of the fat in the area around the waist (called belly fat) is higher than the fat around the hips, there is a greater risk. cardiovascular disease and many other diseases. To measure your waist accurately, when measuring you should stand up straight wearing only your underwear and place the tape measure around your lower abdomen, below your navel and just above your hip bones. Inhale and then measure your waistline immediately after exhaling.
- When measuring your waist, you should use a tape measure so that it can be easily wrapped around your waist, but avoid squeezing too tightly into the soft tissue underneath.
- If the waist size is greater than 90 cm for women and 102 cm for men, there is a high risk of the disease.
- You can use the US Navy’s calculation method, i.e., based on waist, hip, and neck measurements with height and weight to determine an estimate of body density and fat percentage. [3] X Research Sources
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Use a caliper to measure body fat. The caliper method (also known as the caliper method) involves pulling the subcutaneous fat layer away from the muscle at some point and using a caliper to measure the thickness of this fold. This measurement will then be converted to an estimate of body fat percentage using its own formula, to calculate you only need three measurements at different body points, while other methods may require you must have up to seven measurements. Although the caliper method does not give accurate body fat percentage results, it is a reliable measure of how the same person changes over time (with an error of about 3 %). Although, this level of error may be higher for people who are too thin or too obese. You can ask a friend or family member to help you measure, or take the test at a fitness club, health room, or hospital.
- Note, when using a caliper to measure you should use the same fixed force at all measuring points.
- It is better to have a professional use a caliper to measure for accurate results.
- Estimation of body fat in skin folds depends in part on the type of caliper and how it is measured. However, the caliper method can only measure one type of fat: subcutaneous adipose tissue. [4] X Research Sources
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Measure bioelectrical impedance. Bioelectrical impedance measurement is a method of measuring the body’s fat composition, relative to other tissues, by the impedance of adipose tissue to electricity. [5] X Research Source Fat tissue does not conduct electricity, while muscle and bone tissue conduct electricity (although quite poorly). Thus, you measure the level of electricity through the fatty tissue compared to other tissues in the body. The results of the bioelectrical impedance measurement method have an accuracy of about 95% depending on the water content in the body, the water content in the body fluctuates due to exercise, diet, sweat, water level, etc. moisturizing and the use of alcohol or drugs. The advantage of this method is that it does not require an expert and the measuring equipment is usually not too expensive, especially gyms and physiotherapy rooms, almost all of which are equipped with this machine and are free to use.
- You can stand barefoot on a metal plate to pass electricity through your body (looks like a normal scale), or hold a hand-held device (with both hands) to pass electricity through your body Friend.
- For the most accurate results, you must not eat or drink for 4 hours before the test; no vigorous activity within 12 hours; and do not drink alcohol or diuretics (containing caffeine) within 48 hours.
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Calculate body mass index (BMI). BMI is a very useful indicator of whether you are overweight or obese and at risk for heart disease, high blood pressure, type 2 diabetes, and other health problems. [6] X Trusted Source National Heart, Lung, and Blood Institute Go to source This is calculated based on height and total body weight, so this number is only an estimate of relative body fat. to other tissues in the body. To get your BMI, you divide your body weight (in kilograms) by your height (in metres). The higher the result, the greater the risk of disease. Normal BMI is in the range of 18.5-24.9; When this index exceeds the threshold of 25-29.9, it is considered overweight, and from 30 and above is considered obese and quite dangerous .
- This same BMI measurement applies to most men and women, but there are some limitations, for example the BMI of athletes and people with a lot of muscle is often too high; while in the elderly and those who lose muscle it is often too short. [7] X Trusted Source National Heart, Lung, and Blood Institute Go to Source
- You can get a more specific estimate of body fat percentage by applying BMI to the following equation: (1.20 x BMI) + (0.23 x Age) – (10.8 x gender) – 5.4 . Gender for men is 1 and for women it is 0.
Calculate fat percentage more accurately
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DEXA scanning method. If you want an accurate body fat percentage, have the test done at a facility that has a dual-energy X-ray absorptiometry (DEXA) scanner. The DEXA scanner uses X-ray technology to estimate muscle tissue, bone mineral density and adipose tissue with a high degree of accuracy. [8] X Trusted Source National Health Service (UK) Go to source The scanner combines two x-rays to calculate body composition in different body parts, so you can see which part of body with the highest percentage of body fat (or somewhat of a muscle percentage). The mechanism of operation of this type of scanner is similar to the TSA image scanner at the airport that will scan the radiation through your body, but not too much radiation. The DEXA scanner is considered the gold standard for measuring the percentage of fat in the whole body, as well as in areas such as the arms and legs.
- Unlike an MRI or CT scanner, a DEXA scan doesn’t require you to lie inside a stuffy or covered tunnel. Instead, you lie on your back on an open table and the X-ray scanner slowly scans your body – this usually takes no more than five minutes, although it depends on the part of the body you want to examine. .
- Most major universities (in physiology labs) and many medical facilities have DEXA scanners. You can ask your doctor to recommend a facility with a DEXA scanner in your area. The primary purpose of this type of scanner is to measure bone mineral density. The cost per checkup is anywhere from $100-200 if your health insurance plan doesn’t cover it.
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Underwater weighing. Because muscle and bone tissue is much denser than fat tissue, determining body density is also a useful way to learn body composition. The way to measure underwater weight is you dive into a water tank (with water level gauges in the tank) and the difference in water level before entering after you dive in is used to calculate tissue density and total fat percentage. close. [9] X Research Source The greater the difference, the more bone and muscle tissue you are likely to have, and therefore the lower the fat percentage. Weighing under water (or hydrostatic) is a very accurate measure of body fat percentage – with an error of only 1.5% if followed exactly as directed.
- The main downside of this method is that you get wet and you have to completely exhale while diving underwater for a few seconds.
- Athletes often have denser bone and muscle tissue than non-athletes, so this method may underestimate their body fat percentage.
- Consult your doctor or search online for your local medical or research facility that performs underwater gravimetry, but there may not be many that do. In addition, you should compare the price of this method with the price of a DEXA scan before doing so.
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Get the near-infrared interaction index (NRI). This method helps to measure body fat according to the principles of light absorption, reflection, and near-infrared spectroscopy. [10] X Research Source To estimate body fat composition, a specialist uses a computerized spectrometer with a hand-held optical probe. The optical transducer is pushed into a part of the body (usually the biceps) and emits infrared light that travels through fat and muscle tissue into the bone and is then reflected back to the transducer tube. The measured density numbers will be applied to the prediction equation (which includes your height, weight, and body type) to estimate the percentage of total body fat. Results obtained with this method are not as accurate as using a DEXA scanner or an underwater weighing scale, but are superior to home measurements with calipers or bioelectrical impedance methods.
- NRI-based methods tend to be less accurate for people with extremely lean muscle (body fat percentage <8%) or obese people (body fat percentage > 30%).
- Depending on the level of force applied to the optical transducer, skin color and body moisture, results may vary and may not be accurate.
- NRI equipment is currently quite common in many gyms, health clubs, and weight loss centers and is relatively inexpensive to use, or sometimes free. Or at the physical therapy room that can be equipped with NRI equipment.
Advice
- Some research labs and professional gyms all use the Bod Pod to assess body composition by measuring the volume of inhaled air. Similar to underwater (but without water) weighing, this method is quite accurate and may be the best method for measuring body fat in the elderly and obese and disabled people. , but very few facilities equipped with Bod Pod.
- If your BMI is above 25, you should consult with your doctor about a safe weight loss plan and strategy to minimize your risk of cardiovascular disease.
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This article was co-written by Claudia Carberry, RD, MS. Claudia Carberry is a licensed dietitian specializing in kidney transplantation and counseling for weight loss patients at the University of Arkansas for Medical Sciences. She is a member of the Arkansas Academy of Nutrition and Dietetics. Claudia received her MS in Nutrition from the University of Tennessee Knoxville in 2010.
There are 8 references cited in this article that you can see at the bottom of the page.
This article has been viewed 80,984 times.
Body fat percentage is your body fat mass divided by your total body weight (muscle, bone, water, etc.). Body fat percentage can be a pretty good indicator of some disease risk. For example, the higher the ratio (especially the fat around the abdomen), the greater the risk of cardiovascular disease, diabetes, osteoarthritis, and certain types of cancer. [1] X Trusted Source National Heart, Lung, and Blood Institute Go to source There are now many different ways to calculate body fat percentage, ranging from the rather old traditional method (such as using a caliper) to the traditional method (such as using a caliper). High-tech body scanning method. You can calculate this rate yourself at home although the results may not be perfect but are quite accurate, but if you want the most accurate results, you must have it checked with expensive equipment and cared for by a professional. health performance.
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