Yield actual yieldtheoretical yield x 100. Calculating percentage yield The percentage yield is calculated using this equation. Remember that if you get a percent yield of 80 this means that the reaction of the chemicals is 80 efficient and 20 of the materials that will be wasted.
A percent yield of 90 means the reaction was 90 efficient and 10 of the materials were wasted they failed to react or their products were not captured.
Formula for percentage yield. In a true experiment you are likely to lose some through the inefficiency of the experiment itself. 1291 Percent Yield Actual Yield Theoretical Yield 100 Percent yield is very important in the manufacture of products. Usually percent yield is lower than 100 because the actual yield is often less than the theoretical value.