Percent Yield Calculator
Calculate percent yield, yield ratio and the difference between theoretical and actual product amounts.
What would you like to do next?
Compare actual product with theoretical yield
Enter actual and theoretical yield in the same mass or amount unit. The calculator reports percent yield, the actual-to-theoretical ratio and the difference between the two entries. Keeping the raw difference alongside the percentage helps users spot unit mistakes and understand how much product was not recovered instead of treating one percentage as a complete diagnosis of the experiment.
Investigate values outside the expected range
Theoretical yield must come from a balanced reaction and the true limiting reactant. Actual yield should represent the intended sufficiently dry and pure product. A value above one hundred percent often indicates residual solvent, impurities, weighing error or an incorrect theoretical basis. This page measures recovery against a model; it does not identify the cause of loss or certify purity.
Frequently asked questions
Must both yields use the same unit?
Yes. Compatible units are required because the calculation is a ratio.
Can percent yield exceed one hundred?
It can be calculated, but usually signals impurities, moisture, measurement error or a wrong theoretical value.
Does high yield prove high purity?
No. Purity and identity require separate evidence.