Percent Composition Calculator

About Percent Composition Calculator

The Percent Composition Calculator computes the percentage by mass of each element in a chemical compound based on its molecular formula. It’s a useful tool for chemistry students and researchers analyzing compound compositions.

How to Use

• Enter the molecular formula (e.g., C6H12O6) using the keypad buttons (C, H, O, N, S, P, Cl, Na, K, F, and digits 0–9) or keyboard.
• Click the “Calculate” button to compute the percent composition. The page will scroll to the result.
• Click the “Clear” button to reset the input 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 percent composition for each element and detailed calculation steps will be displayed in a table.

Formulas

Mass Contribution:

Percent Composition:

Important Notes

• The molecular formula must be valid (e.g., C6H12O6, NaCl). Use uppercase for the first letter of elements and lowercase for the second (if applicable).
• Molar masses are predefined for C, H, O, N, S, P, Cl, Na, K, F. 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.