Empirical Formula Calculator

Empirical Formula Calculator: Calculate Chemical Empirical Formula

Calculate the empirical formula of a chemical compound based on the percentage composition of its elements. Select elements and input their percentages using the keypad or keyboard, then click Calculate to get the empirical formula.

How It Works

Select an element from the dropdown or keypad, enter its percentage composition, and add it to the input table. Repeat for all elements in the compound, ensuring percentages sum to approximately 100%. Click “Calculate” to see the empirical formula. The calculator displays the empirical formula and detailed calculation steps. Use the “Share” button to copy the calculator’s URL or the “Embed” button to copy an iframe code for embedding on another website.

Empirical Formula Calculator

Element	Percentage (%)

Result

Empirical Formula:

Steps

About Empirical Formula Calculator

The Empirical Formula Calculator computes the simplest whole-number ratio of elements in a chemical compound based on their percentage composition. It’s a useful tool for chemistry students and researchers analyzing unknown compounds.

How to Use

Select an element from the dropdown or keypad (C, H, O, N, S).
Enter the percentage composition (0–100%) for the element.
Click “Add Element” to include the element in the composition table.
Repeat for all elements in the compound, ensuring percentages sum to approximately 100%.
Click the “Calculate” button to compute the empirical formula. The page will scroll to the result.
Click the “Clear” button to reset the inputs and results.
Click the “Share” button to copy the calculator’s URL to your clipboard for sharing.
Click the “Embed” button to copy an iframe code for embedding the calculator on another website.
The empirical formula and detailed calculation steps will be displayed.

Formulas

Moles of Element:

Moles = Mass (g) / Molar Mass (g/mol)

Ratio:

Ratio = Moles / Smallest Mole Value

Empirical Formula:

Simplest whole-number ratio of elements

Important Notes

Percentages must sum to approximately 100% (±1%).
At least two elements are required for calculation.
Molar masses are predefined for C, H, O, N, S. For other elements, you’ll be prompted to enter the molar mass.
The “Share” and “Embed” buttons require a browser that supports the Clipboard API.