How to use the Contribution Margin Calculator

Calculate unit and aggregate contribution margin from selling price and variable costs.

Calculation formula

Contribution margin per unit = selling price − variable cost; contribution margin ratio = unit contribution ÷ price × 100.

Recommended steps

1. Enter values using the units shown beside each field.
2. Review whether the example assumptions match your situation.
3. Run the calculator and compare the key metrics.
4. Use the source data or official rates when precision matters.

Known limitations

Contribution is before fixed costs, interest and taxes.