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Contribution Margin Calculator

Calculate contribution margin, contribution margin ratio, and break-even sales from your selling price, variable cost, fixed costs, and units sold.

Your Details

Overview

A contribution margin calculator helps you see how much of each sale is left after variable costs to cover fixed costs and profit. Enter your selling price per unit, variable cost per unit, fixed costs, and units sold to estimate your per-unit margin, margin ratio, profit, and break-even point.

How it works

The calculator subtracts variable cost per unit from selling price per unit to find contribution margin per unit. It then divides that amount by selling price to calculate the contribution margin ratio. Total contribution margin is found by multiplying contribution margin per unit by units sold. Estimated profit is total contribution margin minus fixed costs. Break-even units are fixed costs divided by contribution margin per unit, and break-even sales are fixed costs divided by the contribution margin ratio expressed as a decimal.

How to use this calculator

  1. 1Enter your selling price per unit.
  2. 2Add your variable cost per unit.
  3. 3Enter your total fixed costs for the same period.
  4. 4Input the number of units sold or expected to be sold.
  5. 5Review the contribution margin, profit estimate, and break-even results.

Example Calculation

Selling price per unit

$50

Variable cost per unit

$20

Total fixed costs

$5,000

Units sold

300

Contribution margin per unit

$30.00

If you sell 300 units at $50 each with a variable cost of $20 per unit and fixed costs of $5,000, the contribution margin is $30 per unit, the contribution margin ratio is 60%, estimated profit is $4,000, and break-even sales are about $8,333.33.

Frequently asked questions

What does contribution margin mean?

Contribution margin is the amount of revenue left after variable costs are deducted. It helps cover fixed costs and then contributes to profit.

What is the difference between gross profit and contribution margin?

Gross profit usually subtracts cost of goods sold from revenue, while contribution margin focuses on variable costs only. This makes contribution margin useful for break-even and pricing analysis.

What is a good contribution margin ratio?

There is no single ideal ratio. A higher contribution margin ratio generally means more of each sales dollar is available to cover fixed costs and profit, but what is considered good depends on your industry and business model.

How do I calculate break-even units?

Break-even units are calculated by dividing fixed costs by contribution margin per unit. This estimates how many units you need to sell to cover fixed costs.

Can I use this calculator for services as well as products?

Yes. You can use it for services if you can estimate an average selling price per job or billable unit and the variable cost associated with each one.

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Assumptions and warnings

Assumptions

  • All units are sold at the same average selling price.
  • Variable cost per unit stays constant across the sales volume entered.
  • Fixed costs are treated as constant for the selected period.
  • Results are estimates and do not include taxes, financing costs, or non-operating items.

Warnings

  • This calculator provides an estimate only and is not accounting or financial advice.
  • Review your actual pricing, cost structure, and reporting period before making business decisions.