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Empirical Formula from Percent Composition

Result

Calculated result 1.6666666667 Based on the values entered.
↗ Chemistry

Empirical Formula from Percent Composition — free online calculator.

Formula

Moles of element = percent by mass / molar mass; empirical formula from simplest whole number ratios
  • Empirical Formula from Percent Composition calculates its result from Percent By Mass, Molar Mass. It uses the formula Moles of element = percent by mass / molar mass; empirical formula from simplest whole number ratios. Change any input to recalculate the result instantly.
  • The main inputs are Percent By Mass, Molar Mass. Enter them in the units and format shown in the calculator.
  • Use the units, labels and assumptions shown beside each input so the formula is applied consistently.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Empirical Formula from Percent Composition

Inputs
  • Percent By Mass: 5
  • Molar Mass: 3

Using Percent By Mass = 5, Molar Mass = 3, the calculated result is 1.6666666667.

Sample result: Calculating…

Frequently asked questions

What does the Empirical Formula from Percent Composition calculate?

Empirical Formula from Percent Composition — free online calculator.

Which values should I enter?

Enter Percent By Mass, Molar Mass using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: Moles of element = percent by mass / molar mass; empirical formula from simplest whole number ratios.

Why might my result differ from another source?

Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 7, 2026