Percent Composition Calculator

What Is a Percent Composition Calculator?

Percent composition tells you what fraction of a compound's total mass is made up by one particular element or ingredient. It's useful for checking purity, verifying a chemical formula, or working out nutritional content.

How to Use This Percent Composition Calculator

1. Enter the mass of the specific element or component you're interested in, in grams.
2. Enter the total mass of the whole compound or mixture, in grams.
3. Click Calculate to get the percent composition.

Formula

• Percent Composition = (mass of part / total mass) × 100

Worked Example

A 44 g sample of CO₂ contains 12 g of carbon. Percent Composition of carbon = (12/44) × 100 ≈ 27.27%.