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Contribution Margin, Ratio & Operating Result

Compare sales with variable costs, subtract entered fixed costs and retain profitable, zero-contribution and loss scenarios.

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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Results are estimates for planning and education. Confirm rates, taxes, fees, and legal requirements with the relevant institution or a qualified professional before making a financial decision.

Formula and method

Selling 100 units at 20 each with variable cost 12 per unit gives contribution of 800 and a 40% contribution ratio. Fixed costs of 500 leave 300.

Contribution = units × (price − variable cost/unit); ratio = contribution ÷ sales; modeled operating result = contribution − fixed costs

Worked example

Enter these known values and leave the other values blank.

Selling price per unit
20 USD
Variable cost per unit
12 USD
Units sold
100
Fixed costs for the period
500 USD
Total contribution margin
800 USD
Contribution margin ratio
40 %
Result after entered fixed costs
300 USD

Assumptions and limitations

  • Selling price and quantity are positive. Variable cost and fixed cost are nonnegative.
  • All quantities and costs refer to one period and product mix. Per-unit price and variable cost are treated as constant.
  • Zero or negative contribution is retained. The result subtracts only entered fixed costs, without adding interest, taxes or omitted expenses.

Common questions

How is contribution different from gross profit?

Contribution subtracts variable costs. Gross profit follows cost-of-goods-sold classifications, which can also include fixed production costs.

Can the contribution margin be negative?

Yes. If variable cost per unit exceeds selling price, each modeled unit adds negative contribution.

References

Bookify permits zero and negative contribution while requiring nonnegative entered costs.

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