Business

Contribution Margin Calculator

Calculate contribution margin per unit to see how much each sale contributes toward fixed costs and profit.

Last reviewed: April 30, 2026Free toolMethodology

Contribution Margin Calculator

These fields start with sample inputs. Keep them or replace them, then run the tool to show a fresh result.

Number fields accept plain values and common formatted input such as 250000, 250,000, or 1,234.56.

Result

Calculating the sample result.

Why it matters

Contribution margin sits at the center of pricing, break-even, and channel mix decisions because it isolates the economics of one more sale.

When to use

  • Comparing products with different unit costs
  • Evaluating discounts or reseller commissions
  • Estimating how many units a campaign must generate to be worthwhile

Inputs & Outputs

Inputs

  • Selling price per unit is the average amount collected per sale.
  • Variable cost per unit includes only the costs that rise with each additional unit sold.

Outputs

  • Contribution margin per unit shows the absolute amount left after variable cost.
  • Contribution margin ratio shows that amount as a share of selling price.

Contribution margin logic

Subtract variable cost per unit from selling price to find contribution margin. Divide that number by price to convert it into a ratio.

Contribution margin ratio = (selling price - variable cost) / selling price

Worked example

1

Promo profitability check

A product sells for 65 and carries 27 in variable cost.

Inputs

  • Selling price: 65
  • Variable cost: 27

Steps

  • Contribution margin = 65 - 27 = 38
  • Ratio = 38 / 65 = 58.46%

Result

  • Each sale contributes 38 toward fixed costs and profit, a 58.46% ratio.

Edge cases & caveats

  • Keep fixed costs out of the variable cost input or the metric loses its planning value.
  • If channel fees vary, calculate contribution margin separately for each channel.

Frequently Asked Questions

Why is contribution margin useful for break-even analysis?

Because break-even units are calculated by dividing fixed costs by contribution margin per unit.

Can a product have a positive gross profit but weak contribution margin?

Yes. Extra commissions, fulfillment costs, or platform fees can reduce the amount left to cover fixed costs even when gross profit is positive.

Keep going

Related Tools

business

Break-Even Calculator

Calculate how many units you need to sell to cover fixed costs at a given price and variable cost per unit.

Open
business

Gross Margin Calculator

Work out gross margin from revenue and direct cost of goods or delivery costs.

Open
business

Markup Calculator

Calculate markup percentage from cost and selling price to check whether pricing covers margin targets.

Open