Percent Yield Calculator
Calculate percent yield from actual and theoretical yield values.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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Enter the actual yield (what you obtained from the experiment) and the theoretical yield (the maximum possible based on stoichiometry). The calculator divides actual by theoretical and multiplies by 100.
About the Percent Yield Calculator
Percent yield measures the efficiency of a chemical reaction by comparing the actual product obtained to the maximum possible (theoretical yield). It is a key metric in synthetic chemistry for evaluating reaction conditions, optimizing procedures, and comparing methods.
Frequently Asked Questions
What is a good percent yield?
In organic chemistry, yields above 90% are considered excellent, 70-90% are good, and below 50% are poor. Some complex multi-step syntheses may have lower yields per step. Yields above 100% indicate impurities or measurement error.
Can percent yield be over 100%?
A percent yield over 100% indicates experimental error, usually from impurities in the product, incomplete drying, or measurement mistakes. The true yield of a pure product cannot exceed the theoretical maximum.
What is the difference between percent yield and atom economy?
Percent yield measures how much of the theoretical product you actually obtained. Atom economy measures what fraction of the reactant atoms end up in the desired product. A reaction can have high atom economy but low percent yield, or vice versa.