Finance

Contribution Margin Calculator

Calculate contribution margin per unit, contribution margin ratio, selling price, or variable costs — solve for any variable given the other two.

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Contribution Margin Formulas

Contribution Margin

CM = Selling Price − Variable Cost

CM Ratio

CM Ratio = (CM ÷ Selling Price) × 100

Break-Even Units

Break-Even = Fixed Costs ÷ CM per Unit

What is contribution margin and how is it used?

Contribution margin is one of the most actionable numbers in managerial accounting. Unlike gross margin, which can be distorted by fixed overhead allocations, contribution margin isolates the direct economic contribution of each unit sold. This makes it essential for decisions like pricing new products, evaluating which product lines to expand or discontinue, and understanding how volume changes affect profitability.

The contribution margin ratio is particularly useful for comparing products with different selling prices. A product selling for $200 with a $60 contribution margin has a 30 percent CM ratio, while a product selling for $50 with a $20 contribution margin has a 40 percent ratio. Even though the absolute dollar contribution is higher for the first product, the second uses each sales dollar more efficiently, which matters when evaluating where to focus sales and marketing efforts.

Frequently asked questions

What is contribution margin?
Contribution margin is the revenue that remains after all variable costs are deducted from the selling price. It represents the portion of each sale available to cover fixed costs and, once those are covered, to generate profit. It is a fundamental metric in cost-volume-profit analysis and product pricing decisions.
How is contribution margin different from gross profit?
Gross profit subtracts only the cost of goods sold, which may include some fixed manufacturing overhead allocated per unit. Contribution margin subtracts all variable costs regardless of category, giving a purer view of how each additional unit of sale contributes to covering the fixed cost base.
What is the contribution margin ratio?
Contribution margin ratio expresses contribution margin as a percentage of the selling price. It tells you what proportion of every sales dollar flows toward covering fixed costs and generating profit. A higher ratio means more of each dollar survives variable costs and is available for the business.
How do I use contribution margin to find the break-even point?
Divide total fixed costs by the contribution margin per unit to find how many units you must sell to break even. For example, if fixed costs are $60,000 and the contribution margin per unit is $20, you need to sell 3,000 units to cover all costs and reach zero profit.
Can contribution margin be negative?
Yes. If variable costs per unit exceed the selling price, the contribution margin is negative, meaning every additional sale deepens the total loss rather than helping recover fixed costs. This situation requires immediate repricing, cost reduction, or discontinuation of the product to avoid compounding losses.

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