Business calculator
Free Contribution Margin Calculator
Calculate contribution margin and ratio from revenue and variable costs.
Contribution Margin Calculator
Practical business calculation
Separate variable-cost coverage from fixed-cost profit
Contribution margin is revenue minus variable costs. Its ratio shows how much of each revenue dollar remains to cover fixed costs and then profit.
Contribution amount
Revenue minus variable costs is the amount available for fixed costs and profit.
Contribution ratio
The ratio expresses contribution margin as a percentage of revenue.
Not profit margin
Contribution margin excludes fixed operating costs; profit margin can reflect profit after broader costs.
Zero revenue
The absolute contribution amount can show, but the ratio needs a revenue base.
How to use this calculator
Enter the assumptions you already have
- 1
Add your figures
Use the inputs that match the period or decision you are analyzing.
- 2
Choose a currency
The shared currency setting keeps monetary results readable across supported currencies.
- 3
Review the result
Use the breakdown to check the arithmetic before applying it to a business decision.
Contribution margin versus profit margin
Contribution margin focuses on revenue less variable costs. Profit margin is based on profit after the costs included in the selected profit definition, so the two answer different questions.
Why the ratio matters
The contribution margin ratio indicates how much of each revenue dollar remains after variable costs. That remaining amount can contribute toward fixed costs before profit.
Use a consistent cost definition
Classify costs according to the accounting or planning approach you use. A cost that changes with volume is generally treated differently from a fixed operating cost, but real classifications can require professional judgment.
Example: 40% contribution margin ratio
Revenue: $50,000 Variable costs: $30,000 Contribution margin: $20,000 Contribution margin ratio: $20,000 ÷ $50,000 × 100 = 40%
Common mistakes to avoid
Frequently asked questions
Practical questions people ask about this tool
What is contribution margin?
Contribution margin equals revenue minus variable costs.
How is the contribution margin ratio calculated?
The ratio equals contribution margin divided by revenue, multiplied by 100.
How is it different from profit margin?
Contribution margin is before fixed operating costs, while profit margin reflects profit relative to revenue after the costs included in the profit calculation.
What happens when revenue is zero?
The calculator shows the absolute contribution amount and marks the ratio as not calculable from zero revenue.
Related tools
Use contribution margin with cost and break-even tools
Break-Even Calculator
Use contribution margin to find break-even.
Profit Margin Calculator
Review profit relative to selling price.
Business Expense Calculator
Total business costs.
Cost Per Unit Calculator
Calculate average unit cost.
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