Percent Yield Calculator
Calculate the percent yield of a chemical reaction from actual and theoretical yields.
The Percent Yield Calculator determines how efficient a chemical reaction was by comparing the actual yield to the theoretical yield. Percent yield = (actual yield / theoretical yield) x 100%.
Enter the actual amount of product obtained from the experiment and the theoretical amount predicted by stoichiometry. A percent yield of 100% means the reaction was perfectly efficient, though this is rare in practice.
Percent yield is essential for evaluating reaction efficiency, optimizing industrial processes, and grading laboratory experiments. Most real reactions yield 60-90% due to side reactions, incomplete reactions, and losses during purification.
Frequently Asked Questions
What is percent yield?
Percent yield measures reaction efficiency: (actual yield / theoretical yield) x 100%. It tells you how much product you obtained compared to the maximum possible.
Can percent yield exceed 100%?
In theory no, but in practice impurities or incomplete drying can cause measured yields above 100%. This indicates experimental error.
What is a good percent yield?
Above 90% is excellent, 70-90% is good, and below 50% may indicate problems with the reaction conditions or technique.