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Chemistry

Percent Yield Calculator

Compare actual product yield with the theoretical maximum and flag results above 100%.

Explicit units and model assumptionsLocal calculations with worked examples
Chemistry workspace
Chemistry workspace

Check the units, concentration basis and assumptions before interpreting the result.

See the method

Set up your calculation

Runs on your device

Your chemistry result

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter actual product mass, theoretical product mass.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Percent yield = actual yield ÷ theoretical yield × 100. Both yields must refer to the same product and use the same units.

A WORKED EXAMPLE

Using actual product mass = 8 g, theoretical product mass = 10 g, the result is 80 %. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

A measured value can exceed the theoretical mass when the sample contains solvent or impurities, or when measurements or assumptions are wrong. It is a reason to review the experiment.

What to keep in mind

Does not determine product purity or calculate theoretical yield from a reaction. Educational calculation only; use validated procedures for laboratory work.

Reference: OpenStax Chemistry 2e — chemical quantities and models

Common questions

Is a yield above 100% possible?

A measured value can exceed the theoretical mass when the sample contains solvent or impurities, or when measurements or assumptions are wrong. It is a reason to review the experiment.

Are my inputs uploaded?

No. This calculation runs in your browser without an account or an external API.

Methodology maintained by ClarityKit. How these tools are built and checked.