# Reaction Yield Calculator

Free reaction yield calculator. Calculate percent yield, actual yield, or theoretical yield with yield assessment and step-by-step solutions.

## What this calculates

Calculate the percent yield of a chemical reaction: % yield = (actual yield / theoretical yield) × 100. Determine how efficient your reaction was compared to the theoretical maximum.

## Inputs

- **Solve For** — options: Percent Yield (%), Actual Yield, Theoretical Yield — Select what to calculate.
- **Actual Yield** (g) — min 0 — The actual amount of product obtained from the experiment.
- **Theoretical Yield** (g) — min 0 — The maximum possible yield calculated from stoichiometry.
- **Percent Yield** (%) — min 0, max 200 — Percent yield of the reaction.

## Outputs

- **Result** — The calculated value.
- **Unit** — formatted as text — Unit of the result.
- **Yield Assessment** — formatted as text — Qualitative assessment of the yield.
- **Formula** — formatted as text — Step-by-step calculation.

## Frequently Asked Questions

**Q: What is percent yield?**

A: Percent yield measures the efficiency of a chemical reaction by comparing the actual product obtained to the maximum possible (theoretical) product. % yield = (actual / theoretical) × 100.

**Q: Why is percent yield usually less than 100%?**

A: Yields below 100% are caused by incomplete reactions, side reactions, product loss during purification, transfer losses, and measurement errors. It is rare to achieve exactly 100% yield.

**Q: Can percent yield exceed 100%?**

A: A true chemical reaction cannot produce more than 100% of the theoretical yield. Values above 100% usually indicate impurities in the product, residual solvent, incomplete drying, or calculation errors.

**Q: How do I find the theoretical yield?**

A: Use stoichiometry: (1) find moles of limiting reagent, (2) use the mole ratio to find moles of product, (3) convert moles of product to grams using the product's molar mass. This gives the maximum possible product.

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Source: https://vastcalc.com/calculators/chemistry/reaction-yield
Category: Chemistry
Last updated: 2026-04-21