Contribution Margin Calculator

The contribution margin is the revenue remaining after subtracting all variable costs associated with producing a product. It represents the amount available to cover fixed costs and, once fixed costs are covered, contribute to profit. In formula terms: Contribution Margin = Revenue − Variable Costs.

The contribution margin per unit is calculated by subtracting the variable cost per unit from the selling price per unit: CM per Unit = Selling Price − Variable Cost per Unit. For example, if you sell a product for $100 and the variable cost is $60, the contribution margin per unit is $40.

The contribution margin ratio (CM ratio) expresses the contribution margin as a percentage of revenue: CM Ratio = (Revenue − Variable Costs) ÷ Revenue × 100. A higher CM ratio means more of each sales dollar is available to cover fixed costs and generate profit.

Contribution margin subtracts only variable costs from revenue, while gross margin subtracts the cost of goods sold (COGS), which typically includes both variable and some fixed manufacturing costs. Contribution margin is more useful for internal decision-making, pricing, and break-even analysis, while gross margin is a standard accounting metric.

The contribution margin helps businesses determine how much revenue each product generates to cover fixed costs and reach profitability. It is essential for break-even analysis, pricing decisions, product mix optimization, and evaluating the profitability of individual products or segments.

A 'good' CM ratio varies by industry. Service businesses often have CM ratios above 50%, while manufacturing businesses may range from 20%–40%. The key benchmark is whether your total contribution margin is sufficient to cover all fixed costs and leave a profit. Higher is generally better, but context matters.

The break-even point in units is calculated as Fixed Costs ÷ Contribution Margin per Unit. Once you know your CM per unit, you can determine exactly how many units must be sold before your business stops losing money. This makes the contribution margin a foundational concept in break-even and profitability planning.

Yes. A negative contribution margin means the variable cost per unit exceeds the selling price, so every unit sold actually increases losses. This is a serious signal that pricing or cost structure needs to be corrected immediately, as no volume of sales will cover fixed costs in this scenario.