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Empirical Formula Calculator

Determine the empirical formula ratio from elemental mass percentages.

Introduction

Empirical Formula Calculator — Determine the empirical formula ratio from elemental mass percentages. Enter Mass % of each element (comma-separated), Atomic mass of each element (comma-separated) to get an instant, accurate result.

Formula

Divide each element's mass percent by its atomic mass to get relative moles, then divide every mole value by the smallest one to get whole-number mole ratios (the empirical formula subscripts).

Step-by-step

  1. Enter the Mass % of each element (comma-separated).
  2. Enter the Atomic mass of each element (comma-separated).
  3. Click Calculate to see your result instantly.

Real-world example

Example: With Mass % of each element (comma-separated) = 11.19,88.81, Atomic mass of each element (comma-separated) = 1.008,16.00, the Empirical Formula Calculator gives Moles: 11.1012, 5.5506, Ratios: 2, 1.

Frequently Asked Questions

What if the mole ratios aren't whole numbers?
Ratios close to a simple fraction (like x.5) should be multiplied through by a small whole number (e.g. 2) so all subscripts become whole numbers.
What is the difference between empirical and molecular formula?
The empirical formula shows the simplest whole-number atom ratio, while the molecular formula shows the actual number of atoms — the molecular formula is always a whole-number multiple of the empirical formula.
What inputs does the Empirical Formula Calculator need?
You'll need to provide: Mass % of each element (comma-separated), Atomic mass of each element (comma-separated). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Empirical Formula Calculator?
The Empirical Formula Calculator applies the formula exactly as calculated — Divide each element's mass percent by its atomic mass to get relative moles, then divide every mole value by the smallest one to get whole-number mole ratios (the empirical formula subscripts). — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Empirical Formula Calculator free to use?
Yes, the Empirical Formula Calculator is completely free, requires no signup, and runs instantly in your browser.

About the Empirical Formula Calculator

The Empirical Formula Calculator uses a real, verifiable formula — Divide each element's mass percent by its atomic mass to get relative moles, then divide every mole value by the smallest one to get whole-number mole ratios (the empirical formula subscripts). — so results are accurate every time, not an approximation.