To calculate percent usual body weight (%UBW) you just use the following formula:
%UBW = (100 x Actual Weight)/Usual body weight
For example, if you have a woman who normally weighs 180lbs, but due to trauma or surgery currently weighs only 162, her %UBW would be as follows:
%UBW = (100 x 162)/180 = 90%
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