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Chemistry

Reaction Yield Calculator

Calculate percent yield and loss from theoretical and actual yield values.

Last validated: 2026-02-14

Use this free online Reaction Yield Calculator to compute percent yield from theoretical and actual product amounts. It is useful for classwork, lab checks, design screening, and engineering sanity checks where units and assumptions must stay visible. The form focuses on Theoretical yield (g), Actual yield (g) and returns Reaction Yield Inputs, Yield Results, so you can move from input to answer without setting up a spreadsheet or custom script. Run one realistic example, adjust the inputs, and compare how the result changes before you copy or share it. Check units and formula assumptions carefully; for safety-critical or code-governed work, validate the result with authoritative references.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

Reaction Yield Inputs

Calculate percent yield from theoretical and actual yield.

Yield Results

Percent yield: 80.00%

Yield loss: 2.400000 g

Efficiency flag: Good (>= 80%)

How to use this tool

  1. Enter Theoretical yield (g), Actual yield (g) for the reaction yield calculator, keeping units, dates, or text format consistent with the form labels.
  2. Confirm all units and known variables before running the calculation so the formula is applied consistently.
  3. Click "Run the tool" and review Reaction Yield Inputs, Yield Results for the primary output.
  4. Verify units and assumptions, especially before using the result for design, lab, or safety-sensitive work.

Worked Example

Auto-generated from the tool's current default or entered inputs.

Example Inputs

  • Theoretical yield: 12.0
  • Actual yield: 9.6
  • Percent yield: 80.0
  • Yield loss: 2.4000000000000004
  • Efficient reaction: true

Expected Outputs

  • Theoretical yield: 12
  • Actual yield: 9.6
  • Percent yield: 80
  • Yield loss: 2.4

Interpretation

Confidence and limitations

Formula References

Assumptions

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