## Tuesday, June 18, 2013

### How To Find a Persons Weight For a Desired % Bodyfat

If you know your present weight and % bodyfat it is possible to determine what your weight should be for any % bodyfat. This can be done by simple calculations. Firstly subtract your present % bodyfat from 100 and divide this by 100 minus the desired % bodyfat. Multiply this by the present weight and this will give you the weight for the desired % bodyfat. For example, a female 145 lb. who is now 32% bodyfat. She desires to be 21% and wants to know what she would weight if she was 21% bodyfat. Subtracting 32 from 100 she gets 68. 21 from 100 equals 79. Then, 68 divided by 79 equals 0.86. Multiply 145 lbs. x 0.86 and this will give her a desired weight of 125 lbs.

She has learned that to reduce her % bodyfat to 21%, she must lose 20 lbs. However, the above formula only works if the person reduces in such a way as not to lose muscle tissue. This can be done through adequate exercise and proper nutrition. If the weight is lost primarily through a low calories diet in a short period of time then muscle tissue will be lost, as well, and the weight for the desired % bodyfat will be correspondingly less.

Reviewing the basic calculations above:

Present % Bodyfat = 32% ~ Desired % Bodyfat = 21% ~ Present Weight = 145 lbs.
100 – 32 = 68
100 – 21 = 79
68 ÷ 79 = 0.86
Desired Weight = 145 x 0.86 = 125 lbs.

Another example of the above is a weight trainer who is currently 200 lbs. and is 21% bodyfat and wants to get to 5% bodyfat, how much weight would he have to lose to achieve this goal?

Present Bodyfat = 21% ~ Desired Bodyfat = 5% ~ Present Weight 200 lbs.
100 – 21 = 79
100 – 5 = 95
79 ÷ 95 = 0.83
200 x 0.83 = 166
200 – 166 = 34 lbs.

So to achieve a 5% bodyfat he would have to lose 34 lb of bodyfat and should have a lean body mass of 166 lbs. By having his bodyfat done on a regular basis will enable him to see if his dieting to achieve his goal involves the loss of his hard earned lean body mass (Muscle Growth).

So there you go, there's all the information you need to measure and monitor your bodyfat and lean muscle mass.