Contribution Margin Calculator

Calculate contribution margin from sales revenue and variable costs

Your result will appear here.

About the Contribution Margin Calculator

Contribution margin shows how much sales revenue remains after variable costs are deducted. That remainder is available to cover fixed costs and, once fixed costs are covered, contribute to operating profit.

It is especially useful for product pricing, break-even analysis and comparing products with different variable-cost structures.

How to Use the Contribution Margin Calculator

  1. Enter sales revenue or selling price per unit.
  2. Enter total variable costs or variable cost per unit on the same basis.
  3. Calculate contribution margin in dollars and as a percentage of sales.
  4. Keep fixed costs separate because they are not deducted when calculating contribution margin.

How the Calculation Works

Total contribution margin = sales revenue − total variable costs. Contribution margin per unit = selling price per unit − variable cost per unit.

Contribution margin ratio = contribution margin ÷ sales revenue × 100. This ratio shows the share of each sales dollar available for fixed costs and profit.

Worked example

Contribution Margin Calculator Worked Example

$80 selling price with $50 variable cost

Contribution margin per unit = $80−$50 = $30. Contribution margin ratio = $30÷$80×100 = 37.5%.

Result guide

Understanding Your Contribution Margin Calculator Result

A higher contribution margin gives more room to cover fixed expenses and profit, but it does not mean the business is profitable if fixed costs are still too high.

Before you rely on the answer

Assumptions and Limitations

  • Variable and fixed costs are classified consistently.
  • Revenue and costs use the same period or per-unit basis.
  • Taxes and financing costs are outside the basic contribution-margin measure.

Practical tip

Using This Result in Practice

Use contribution margin for short-run product and volume decisions, but do not confuse it with net profit. A product can have a positive contribution margin while the business as a whole remains unprofitable.

Related calculations

Useful Calculations to Continue With

If you want to know how many units must be sold before contribution covers fixed costs, use the Break-Even Calculator.

Once break-even is known, use the Margin of Safety Calculator to measure how far expected sales sit above it.

Authoritative references

Useful Official Sources

For standards, definitions or real-world guidance related to this calculation, these primary sources may be useful:

Common questions

Contribution Margin Calculator FAQ

What is contribution margin?

It is revenue minus variable costs.

Is contribution margin the same as gross profit?

Not necessarily. Gross profit follows cost-of-goods-sold accounting, while contribution margin separates costs by variable versus fixed behaviour.

Why is contribution margin useful?

It shows how much each sale contributes toward fixed costs and eventual profit.