CalculationTime

Percent Yield Calculator

Calculate chemistry percent yield from actual yield and theoretical yield, with mass basis, loss amount, signed difference, formula, caveats and a printable lab worksheet record.

Live math canvas

Your numbers, formula and explanation together

Percent Yield Calculator: 108.41 percent of theoretical yield with loss amount and target comparison. Percent Yield Calculator uses the declared inputs to produce a transparent default result. Actual yield: 8.4 g; Theoretical yield: 10 g; Target yield: 90 % optional; Percent rounding increment: 0.01 %; primary comparison: 8.4 and 10.

Formula applied

The exact method behind this answer

CalculationTime keeps the method visible so the number can be checked instead of blindly trusted.

Percent yield = actual yield ÷ theoretical yield × 100. Yield difference = actual yield − theoretical yield. Unrecovered amount = max(0, theoretical yield − actual yield). Target actual yield = theoretical yield × target yield percent ÷ 100.
  1. Apply the formulaPercent yield = actual yield ÷ theoretical yield × 100. Yield difference = actual yield − theoretical yield. Unrecovered amount = max(0, theoretical yield − actual yield). Target actual yield = theoretical yield × target yield percent ÷ 100.108.41 percent of theoretical yield with loss amount and target comparisonPercent Yield Calculator uses the declared inputs to produce a transparent default result. Actual yield: 8.4 g; Theoretical yield: 10 g; Target yield: 90 % optional; Percent rounding increment: 0.01 %; primary comparison: 8.4 and 10.

Your live breakdown

Current inputs in the calculation

These values come from the controls above and update when the calculator changes.

Actual yield
8.4 g
Enter the amount actually recovered from the experiment or production run.
Theoretical yield
10 g
Enter the maximum expected amount from stoichiometry or the problem statement.
Target yield
90 % optional
Optional class, lab or process target for comparison. It is not a safety or compliance limit.
Percent rounding increment
0.01 %
Use 0.01% for lab worksheets or 0.1% for a quick report note.

Resulting answer

108.41 percent of theoretical yield with loss amount and target comparison

Percent Yield Calculator uses the declared inputs to produce a transparent default result. Actual yield: 8.4 g; Theoretical yield: 10 g; Target yield: 90 % optional; Percent rounding increment: 0.01 %; primary comparison: 8.4 and 10.

Answer
108.41 percent of theoretical yield with loss amount and target comparison
Live support
Percent Yield Calculator uses the declared inputs to produce a transparent default result. Actual yield: 8.4 g; Theoretical yield: 10 g; Target yield: 90 % optional; Percent rounding increment: 0.01 %; primary comparison: 8.4 and 10.

Assumptions used

What this answer assumes

Best for chemistry homework, lab notebooks, classroom examples, QA notes and production-learning records where actual and theoretical yield must stay visible beside the percentage.

  • Actual yield and theoretical yield must use the same unit and substance basis, such as grams of the purified product.
  • Theoretical yield is the denominator and must be greater than zero.
  • A percent yield above 100% can happen in real notes when the product is wet, impure, contaminated, weighed incorrectly or when the theoretical-yield setup is wrong.
  • The calculator performs arithmetic only; it does not validate stoichiometry, purity, limiting reactants, significant figures, lab safety or process compliance.
  • For graded lab reports, regulated production or safety decisions, follow the instructor, laboratory method, standard operating procedure or professional review.

Master’s Tip

How to use the result well

Master’s Tip: print the substance name, limiting-reactant note and whether the mass was dry or wet beside the percent yield. The arithmetic can look precise even when the product basis, purity or weighing step is the real source of error.

Printable record

What belongs in the saved calculation

Save the inputs, result, formula, assumptions, page URL and date together so the calculation can be reviewed later.

Actual yield
8.4 g
Enter the amount actually recovered from the experiment or production run.
Theoretical yield
10 g
Enter the maximum expected amount from stoichiometry or the problem statement.
Target yield
90 % optional
Optional class, lab or process target for comparison. It is not a safety or compliance limit.
Percent rounding increment
0.01 %
Use 0.01% for lab worksheets or 0.1% for a quick report note.

Embeddable calculator

Embed this calculator

Copy a clean iframe version with the required CalculationTime attribution link built in.

Formula

Percent yield = actual yield ÷ theoretical yield × 100. Yield difference = actual yield − theoretical yield. Unrecovered amount = max(0, theoretical yield − actual yield). Target actual yield = theoretical yield × target yield percent ÷ 100.

Worked example

If the actual yield is 8.4 g and the theoretical yield is 10 g, percent yield = 8.4 ÷ 10 × 100 = 84.00%. The unrecovered amount is 1.6 g. Against a 90% target, the target actual yield would be 9.0 g, so the result is 0.6 g below target.

Professional note

Master’s Tip: print the substance name, limiting-reactant note and whether the mass was dry or wet beside the percent yield. The arithmetic can look precise even when the product basis, purity or weighing step is the real source of error.

Regional and unit assumptions

Standard or basis: general chemistry percent-yield arithmetic using actual yield divided by theoretical yield. Units are entered as grams by default, but any matching mass or amount unit can be used if actual and theoretical yield share the same basis.

Assumptions and limitations

Methodology & Accuracy

How this calculator is checked

CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.

Formula used

Percent yield = actual yield ÷ theoretical yield × 100. Yield difference = actual yield − theoretical yield. Unrecovered amount = max(0, theoretical yield − actual yield). Target actual yield = theoretical yield × target yield percent ÷ 100.

Standard or basis

Standard or basis: general chemistry percent-yield arithmetic using actual yield divided by theoretical yield. Units are entered as grams by default, but any matching mass or amount unit can be used if actual and theoretical yield share the same basis.

Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.

Master's Tip

Master’s Tip: print the substance name, limiting-reactant note and whether the mass was dry or wet beside the percent yield. The arithmetic can look precise even when the product basis, purity or weighing step is the real source of error.

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Questions

How do you calculate percent yield?

Divide actual yield by theoretical yield, then multiply by 100. For example, 8.4 g ÷ 10 g × 100 = 84%.

What is theoretical yield?

Theoretical yield is the maximum amount expected from the balanced reaction or problem setup, usually based on the limiting reactant.

Can percent yield be over 100%?

Yes in recorded results, but it usually signals wet product, impurities, contamination, weighing error, side material or a mistake in the theoretical-yield setup.

Is percent yield the same as percent error?

No. Percent yield compares actual product recovered with theoretical product expected. Percent error compares a measured value with an accepted reference value.

What should I print for a percent yield lab worksheet?

Print actual yield, theoretical yield, percent yield, unrecovered amount, target comparison, formula, assumptions, page URL, date and notes about substance, limiting reactant, purity and drying.

Calculation note

Percent yield is a bridge between balanced-reaction arithmetic and what was actually recovered. It is useful because it compresses a lab result into one percentage, but the source masses and method notes decide whether that percentage is trustworthy.

Yield depends on the denominator

Theoretical yield is the comparison base. If the limiting reactant, molar mass, purity or stoichiometry setup is wrong, the percent yield can be wrong even when the final division is correct.

Above 100% is a warning, not a bonus

A result above 100% usually means the recovered product includes something extra, such as solvent, water, impurities or measurement error. The calculator keeps signed difference visible so that warning is not hidden.

Printable lab notes protect the method

A useful percent-yield record should include actual yield, theoretical yield, product identity, formula, assumptions and method notes. That makes the number easier to audit in class, a lab notebook or a process review.

Sources and further readingOpenStax Chemistry 2e — Stoichiometry and yieldChem LibreTexts — Theoretical and Percent Yield