Free · Chemical reactions calculators 💥

Reaction Product Mass & Percent Yield

Calculate percent yield from actual and theoretical product masses, or solve either mass with selectable mass units.

Calculator inputs

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Enter the known values in the units shown. Results update as you type.
Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
Use the worked example to check the method. Reset restores the starting fields.

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Collecting 8 g of product from a theoretical 10 g gives an 80% yield. Collecting no product gives 0%.

Percent yield = actual product mass / theoretical product mass × 100

Enter these known values and leave the other values blank.

Both masses must refer to the same product. Theoretical yield must be positive; measured mass and percent yield may be zero.
The theoretical amount is an input. This tool does not balance a chemical equation or identify a limiting reactant.
A reported result above 100% is retained as an arithmetic observation. It can indicate residual solvent, impurities, measurement error or an incorrect theoretical basis rather than excess pure product.
Use an independently determined theoretical yield. When actual yield and percent yield are both zero, a theoretical mass cannot be uniquely inferred.

Yes. Each mass is converted before division. For example, 8 g divided by 0.01 kg still gives 80%.

Bookify accepts zero collected mass and zero measured percent yield while requiring positive theoretical mass.