is bmi accurate if you have a lot of muscle?
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There are a myriad of reasons why BMI isn't as accurate a measure of health as many of us were brought up to believe, but one of the main ones is that BMI can't distinguish between fat and muscle. A pound of fat takes up a much larger volume on the body than a pound of muscle, even though they of course weigh the same.
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To work out your BMI, you divide your weight in kilograms by your height in metres, then divide the answer by your height again. This figure can then be compared against a chart of healthy weights for each height: a normal BMI is between 18.5 and 25.
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Body frame size is not used when calculating BMI; instead, you can figure out your BMI using your height and weight. The BMI measurement does not take into account body composition or sex differences, so its accuracy is debatable.
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Despite progress in medical technology, body mass index (BMI) has long been considered the best DIY method. "Research shows that BMI does help predict mortality," says Dr. Woolcott. "But BMI can't distinguish between weight that comes from muscle and weight that comes from fat."
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Levels in excess of 32% for women and 25% for men are generally considered to indicate obesity. However, accurate measurement of body fat percentage is much more difficult than measurement of BMI.
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While overweight people are distinguished on the basis of their Body Mass Index (BMI), overfat people may have an average weight but a dangerously high level of fat percentage below or above the belt or may be around other body parts.
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Weight that is higher than what is considered as a healthy weight for a given height is described as overweight or obese. Body Mass Index, or BMI, is used as a screening tool for overweight or obesity. Generally, you are not considered obese until your body weight is at least 20% above what it should be.
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BMI is not a reliable measurement of body fat for athletes, but other methods can offer more accurate results. "Percent of body fat is a far better indicator of both health and athleticism of an athlete than BMI," Bonaccorsy says.
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Muscle weighs more than fat. "In simple terms, a pound of muscle weighs the same as a pound of fat," Heimburger tells WebMD. "The difference is that muscle is much more dense than body fat. Therefore, a pound of muscle will take up much less room in your body than a pound of fat.
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As most of us fitness-focused folks have likely heard, BMI is far from a perfect measurement. Much of the time, and often when it really counts, the BMI measurement may actually overestimate or even underestimate a person's body fat. And when it does, it really does.
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However inaccurate, BMI is the most convenient way to classify body fat mass and obesity. There are, on the other hand, better methods to measure whole body fat levels. ... Still, an individual with a healthy BMI may not have healthy levels of body fat.
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The scale can read to a precision of 50g. ... It's not exactly a perfect measure in terms of an accurate measurement, especially around body fat analysis. Still, provided you can get a consistent measurement, it's still a good way to monitor your progress if trying to lose body fat.
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The BMI estimates your level of body fat based on your height and weight. A BMI from 18.5 to 24.9 is considered normal. ... Adults with a BMI greater than or equal to 40 are considered extremely obese. Anyone more than 100 pounds (45 kilograms) overweight is considered morbidly obese.
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BMI ranges If your BMI is: below 18.5 – you're in the underweight range. between 18.5 and 24.9 – you're in the healthy weight range. between 25 and 29.9 – you're in the overweight range.
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Your body size and composition. People who are larger or have more muscle burn more calories, even at rest.
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Adult Body Mass Index (BMI) If your BMI is less than 18.5, it falls within the underweight range. If your BMI is 18.5 to <25, it falls within the normal. If your BMI is 25.0 to <30, it falls within the overweight range. If your BMI is 30.0 or higher, it falls within the obese range.
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Subtract the amount of fat (in pounds) from your original bodyweight in Step 1. This calculation WILL tell you how much LEAN WEIGHT you're currently carrying. However, this first measurement will NOT tell you how much muscle you have since your lean weight is also made up of bones, organs, hair, etc.