Calculate actual yield from theoretical yield and percent yield
An actual yield calculator finds the amount of product recovered when theoretical yield and percent yield are known. Enter the maximum predicted product amount, select its unit, and enter a percentage from 0% to 100%. The answer remains in the same unit—g, mg, kg, mol, or mmol—so the result can be read without an unstated mass-to-mole conversion.
Theoretical yield comes from reaction stoichiometry and the limiting reactant under an ideal complete-conversion assumption. Percent yield compares a measured or expected recovery with that theoretical maximum. Actual yield is the corresponding recovered amount. Keeping these definitions separate prevents the common mistake of treating percent yield as the fraction of reactant used or as a measure of product purity.
Use the actual yield formula
The relationship is actual yield = theoretical yield × percent yield ÷ 100. A percentage must be converted to a decimal fraction before multiplication: 84% becomes 0.84, not 84. The calculator performs that conversion visibly and limits the entered percentage to the ordinary 0%–100% classroom range, where actual yield cannot exceed the stated theoretical yield.
No molar mass is needed because theoretical and actual yield use the same selected unit. If theoretical yield is supplied in moles but an answer in grams is required, first convert with the product’s correct molar mass, or calculate actual moles here and convert afterward. Do not label a molar result as grams merely by changing the unit selector; numerical unit conversion requires chemical information this page does not infer.
Follow an actual yield example
If a balanced-reaction calculation predicts 12.5 g product and the expected percent yield is 84.0%, actual yield = 12.5 g × 84.0 ÷ 100 = 10.5 g. A quick reasonableness check is that 84% is slightly more than four fifths, so an answer near 10 g is sensible and an answer of 1,050 g would reveal a missing division by 100.
The same arithmetic works for amount of substance. A theoretical yield of 2.40 mmol at 65% gives 1.56 mmol actual yield. Keep the unit attached to every intermediate quantity, carry unrounded values until the final step, and round the answer according to the precision of the theoretical yield and percentage rather than the number of digits shown by a browser.
Check percent yield and investigate values above 100%
Divide the displayed actual yield by theoretical yield and multiply by 100. The result should recover the entered percentage within rounding. At 0%, actual yield should be zero; at 100%, it should equal theoretical yield; and increasing the percentage while theoretical yield stays fixed should increase the answer proportionally. These boundaries make copied decimal and percent errors easy to identify.
A measured product mass can sometimes appear greater than theoretical yield, but that does not demonstrate creation of extra desired product. Wet solvent, incomplete drying, impurities, residual salts, a weighing error, incorrect product identity, or an incorrect limiting-reactant calculation commonly explains an apparent yield above 100%. This calculator does not accept an over-100 percentage in its standard mode; investigate the measurement and stoichiometry rather than normalizing the conflict away.
Reaction limits, laboratory meaning, and privacy
The arithmetic does not calculate theoretical yield, identify the limiting reactant, balance the equation, estimate equilibrium conversion, predict selectivity, or determine product purity. A plausible recovered amount is not evidence that a synthesis is safe or successful. Use an approved experimental procedure, suitable analytical identification, proper protective equipment, and appropriate waste handling whenever the values relate to real chemicals or laboratory work.
The values are calculated in the current browser tab. NexaCurrent does not upload the quantities, formulas, chemical names, element choices, or other information entered here, and no account is needed. Copying is a deliberate action after the answer and working are visible. Refreshing or leaving the page clears the current calculation, so keep a copied result if it is needed for later study.