Contribution Margin Ratio Calculator
Contribution margin is revenue remaining after variable costs. The ratio expresses that contribution relative to sales and can estimate break-even sales when the ratio is positive.
How to use this calculator
- Enter revenue, variable costs and fixed costs for the same period.
- Check that all inputs use the same units, period and population scope.
- Change one assumption at a time when comparing scenarios.
Formula used by contribution margin ratio calculator
Contribution margin ratio = (sales − variable costs) ÷ sales; break-even sales = fixed costs ÷ ratio.
- Contribution margin ratio = (sales − variable costs) ÷ sales; break-even sales = fixed costs ÷ ratio.
- This is a simplified cost-volume-profit model. It assumes cost classification is valid and unit prices and variable costs remain stable over the modeled range.
- The tool validates inputs and rounds displayed figures for readability; it does not validate assumptions against external records.
Worked examples
Worked example
Sales are 120,000, variable costs 72,000 and fixed costs 30,000.
Contribution ratio = 40%; break-even sales = 30,000 ÷ 0.40 = 75,000.
The contribution margin ratio is 40%.
Understanding the result
Contribution margin is revenue remaining after variable costs. The ratio expresses that contribution relative to sales and can estimate break-even sales when the ratio is positive.
This is a simplified cost-volume-profit model. It assumes cost classification is valid and unit prices and variable costs remain stable over the modeled range.
Important notes
This is a simplified cost-volume-profit model. It assumes cost classification is valid and unit prices and variable costs remain stable over the modeled range.
Treat the result as an estimate from the entered assumptions. For commercial, statistical, engineering or health-related decisions, verify relevant specifications and professional guidance.
Frequently asked questions
Can the margin ratio be negative?
Yes if variable costs exceed sales; break-even sales is not meaningful in that case.
Does contribution equal net profit?
No. Fixed costs and other items may still need to be deducted.
How should I interpret this result?
This is a simplified cost-volume-profit model. It assumes cost classification is valid and unit prices and variable costs remain stable over the modeled range.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
- How to Calculate Break-Even Point — Learn the break-even formula for units and revenue and understand fixed costs, price, and variable costs.
- How to Calculate Future Value — Learn the future value formula and how growth, contributions, rates, and time affect a projected balance.
- Break-Even Point — Understand break-even point, contribution margin, and the basic unit break-even formula.
This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.