Percent Composition Calculator
Enter component names and masses to total the sample and calculate each mass percentage.
A QUICK WALKTHROUGH
How to use this tool
- Enter each component name and mass in one consistent unit.
- Use at least two complete rows with positive masses.
- Review total mass and each component percentage.
Mass-entry worksheet
Only user-entered names and masses are used. No chemical formulas or atomic masses are looked up. Incomplete optional rows are ignored.
GOOD TO KNOW
Common questions
Can I enter a chemical formula?
No. Enter each component name and mass explicitly.
Do percentages have to sum to 100?
The calculated percentages sum to 100% within rounding.
Does it identify elements?
No. Names are labels only; there is no element or atomic-mass lookup.