About the Percentage Contribution Calculator
Each item’s contribution to a total change or total value — e.g. which products drove revenue growth.
Also known as: contribution to growth, share of change, contribution analysis.
How to use this calculator
- Enter values before, values after.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Contribution = item change ÷ total change
Worked example
Using the values pre-filled in the calculator above:
- Values before: 400, 250, 150
- Values after: 460, 240, 230
the calculator returns:
- Total change: 130