Theoretical and percent yield calculator

Enter coefficients from an already balanced equation aA + bB → pP. Reaction extent is the smaller of available moles divided by coefficient. Theoretical product mass = extent × product coefficient × product molar mass. Percent yield = actual mass/theoretical mass × 100.

Reference: OpenStax reaction yields

The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.

Available reactant A

4 mol

Balanced coefficient of A

2

Available reactant B

1 mol

Balanced coefficient of B

1

Balanced coefficient of product

2

Product molar mass

18.01528 g/mol

Measured actual product mass

30 g

Primary result: Theoretical product mass: 36.03056 g.

• Check the selected mode, units and input values before using the result.
• Read the assumptions and rounding rules; compare the worked example with your intended calculation.
• A numerical result does not supply missing context or change the stated limitations.

Educational bookkeeping for two reactants and one selected product. It does not balance equations, determine whether a reaction occurs, account for purity or side reactions, or provide laboratory preparation instructions. Coefficients must be positive whole numbers from the balanced reaction.