Percentage Yield Formula
The percentage yield formula is the percent ratio of actual yield to the theoretical yield. Yield is a measure of the quantity of moles of a product formed in relation to the reactant consumed, obtained in a chemical reaction, usually expressed as a percentage. The amount of product actually made compared with the maximum calculated yield is called the Percentage yield. Let's look into the percentage yield formula below.
Formula to Calculate Percentage Yield
The percentage yield formula is calculated to be the experimental yield divided by theoretical yield multiplied by 100. If the actual and theoretical yield is the same, the percent yield is 100%. Usually, the percent yield is lower than 100% because the actual yield is often less than the theoretical value.
Percentage Yield = (Actual Yield / Theoretical Yield) × 100 %
where,
 Actual yield  it gives the amount of product obtained from a chemical reaction.
 Theoretical yield  it gives the amount of product obtained from the stoichiometric or balanced equation, using the limiting reactant to determine the product.
 Units for both actual and theoretical yield need to be the same (moles or grams).
Solved Examples Using Percentage Yield Formula

Example 1:
During a chemical reaction, 0.5 g of product is made. The maximum calculated yield is 1.6 g. What is the percentage yield of this reaction?
Solution:
We know that according to Percentage Yield Formula,
Percentage yield = (Actual yield/ Theoretical yield)× 100%
= 0.5/1.6× 100%
= 31.25%
Answer: The percentage yield of this reaction is 31.25%.

Example 2:
During a chemical reaction 1.8 g of product is made. The maximum calculated yield is 3.6 g. What is the percentage yield of this reaction?
Solution:
We know that according to Percentage Yield Formula,
Percentage yield = (Actual yield/ Theoretical yield)× 100%
= 1.8/3.6× 100%
= 50%
Answer: The percentage yield of this reaction is 50%.