Contribution Margin Calculator

Calculate contribution margin

The contribution margin is the amount left from each sale after covering the variable costs of producing that unit, money that contributes toward fixed costs and ultimately profit. It is calculated per unit as the selling price minus the variable cost, and as a ratio by dividing that margin by the selling price. A product selling for fifty with thirty of variable cost has a contribution margin of twenty per unit and a contribution margin ratio of forty percent. If you enter a quantity, the calculator also shows the total contribution across all units.

The ratio is particularly useful because it tells you what fraction of each sales dollar is available to cover fixed costs.

Using contribution margin

Contribution margin is central to pricing, product-mix and break-even decisions. Products with higher contribution margins contribute more to covering overheads, so businesses often prioritise them. The metric also underlies break-even analysis, since dividing fixed costs by the contribution margin gives the sales needed to break even.

Because it isolates variable costs, contribution margin shows the true incremental profitability of each sale, which is more useful for operating decisions than gross profit that may mix in fixed production costs. All calculation happens locally in your browser.

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