BMI Calculator

Of course, these calculators are rough translations of true percentages, and there are a number of factors that might influence whether or not your BMI is a true reflection of your total body fat.

For instance, muscle is more dense than fat and takes up less space. Therefore a heavily muscled person might weigh more than a same sized over-weight person, or two individuals with identical BMI might have widely different percent body fat. In this case, calculating your percent body-fat might require more sophisticated equipment, such as an immersion tank. Since fat is more buoyant than muscle, two same-weight individuals will not float at the same level if they have different percentages of body fat.

Women typically carry more subcutaneous fat than men do, particularly in the breast and hips, so their percent body fat may be higher without it necessarily being reflected in their BMI or having any adverse health effects. Very low body fat, which may or may not show up in a BMI, depending on the individual's musculature, might be unhealthy as well. Your body needs some stores of fat to draw upon for energy and if fat is absent, the body will begin to consume muscle mass to keep itself going. Athletes who over train may find themselves losing strength rather than gaining strength, for instance.

BMI, for all its approximation, is a good tool to use in determining whether you need to lose weight, gain weight, or congratulate yourself for being just right.

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