Reaction Yield Calculator

Calculator Inputs

Reaction Name

Product Name

Batch ID

Input Mode

Limiting Reagent Amount

Use the limiting reagent basis for the stoichiometric calculation.

Limiting Reagent Molar Mass (g/mol)

Reactant Coefficient

Product Coefficient

Product Molar Mass (g/mol)

Actual Product Mass (g)

Product Purity (%)

Expected Process Recovery (%)

Target Yield (%)

Example Data Table

Batch	Limiting Basis	Stoichiometry	Theoretical Mass (g)	Actual Mass (g)	Purity (%)	Pure Actual (g)	Yield (%)
BATCH-01	0.500 mol	1 : 1	44.0500	40.3000	98.0	39.4940	89.66
BATCH-02	25.000 g	2 : 1	18.7200	15.6000	96.5	15.0540	80.42
BATCH-03	1.200 mol	3 : 2	57.6000	48.9000	99.1	48.4599	84.13

Formula Used

1. Convert limiting reagent to moles
When mass is entered, limiting moles = limiting mass ÷ limiting reagent molar mass.

2. Find theoretical product moles
Theoretical product moles = limiting moles × (product coefficient ÷ reactant coefficient).

3. Find theoretical product mass
Theoretical product mass = theoretical product moles × product molar mass.

4. Correct actual mass for purity
Pure actual mass = actual mass × (purity ÷ 100).

5. Calculate percent yield
Percent yield = (pure actual mass ÷ theoretical product mass) × 100.

6. Adjust for expected process recovery
Adjusted theoretical mass = theoretical product mass × (process recovery ÷ 100).

7. Recovery adjusted yield
Recovery adjusted yield = (pure actual mass ÷ adjusted theoretical mass) × 100.

How to Use This Calculator

Select whether the limiting reagent is entered in moles or grams.
Enter the limiting reagent amount. Add limiting molar mass when using gram mode.
Provide the balanced equation coefficients for the limiting reactant and desired product.
Enter the product molar mass, actual isolated mass, measured purity, and expected recovery.
Set a target yield to compare actual performance with your process goal.
Press Calculate Yield to show the result above the form.
Review the graph, summary metrics, and difference values.
Use the CSV and PDF buttons to export the calculated report.

FAQs

1. What does reaction yield measure?

Reaction yield measures how much desired product you obtained compared with the theoretical maximum predicted from stoichiometry and the limiting reagent.

2. Why does purity matter in yield calculations?

Purity matters because crude product mass may include solvent, salts, or impurities. Correcting mass for purity gives a more realistic chemical yield.

3. What is the limiting reagent basis?

The limiting reagent basis is the reactant quantity that restricts maximum product formation. All theoretical yield calculations should be anchored to it.

4. Can percent yield exceed 100%?

Yes, it can appear above 100% when product is impure, wet, weighed incorrectly, or the assumed limiting reagent basis is wrong.

5. What is recovery adjusted yield?

Recovery adjusted yield compares pure actual product against a reduced theoretical maximum after expected process losses are considered.

6. Should I enter grams or moles?

Use moles when you already know the chemical amount. Use grams when you measured mass and know the limiting reagent molar mass.

7. How do coefficients affect theoretical yield?

Coefficients define stoichiometric ratios. They convert limiting reagent moles into expected product moles using the balanced chemical equation.

8. Is this calculator suitable for teaching labs?

Yes. It is useful for teaching labs, batch reviews, pilot runs, and process troubleshooting where yield, purity, and loss tracking matter.