Overview
If you want to get an estimate of your body fat percentage — or the ratio of fat to other tissue in your body — there is a variety of methods to choose from. Although some body fat measurement methods are more accurate than others, there is no 100-percent accurate way to determine your body fat. The amount of fluid in your body plays a role in some forms of body fat measurement and can influence your results.
Body Fat Scales
Body fat scales are the cheapest and most readily available form of body fat measurement. Body fat scales use an electrical current called bioelectrical impedance analysis, or BIA, to determine your body density. The electrical current travels faster through muscle tissue than through bone and fat tissue and calculates an estimate of your body fat percentage based on the speed of the current. The results can be affected by the amount of water in your body, so you should consume the same amount of water before measuring yourself and use the scale at the same time each day. If you are dehydrated, the scale will show a higher body fat percentage than you actually have. Body fat scales are not as accurate as more expensive methods of measurement but they offer a way to track your body fat changes over time.
Fall River — A woman in her 30s wants to start taking aerobics to get back into shape after the birth of her child. One thing is holding her back from exercising in public: 
As a registered personal trainer, I am often asked how to determine a healthy body weight. Let’s briefly discuss different methods.
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