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Percent Composition Calculator
Break any formula into each element’s share of the mass, with every multiplication visible.
Calculator
Results update as you type. Every step of the working is shown below.
Examples:
Result
Enter values above — the answer appears here instantly, with full working.
Formula used
%X = n_X · Aᵣ(X) / M × 100 %
Every result substitutes your values into this relation step by step above.
Assumptions
- Standard atomic weights (CIAAW 2021).