The eCommerce founder’s guide to calculating contribution margin

Contribution margin is a management metric that measures the revenue remaining after variable costs are deducted, helping eCommerce small and medium-sized businesses evaluate product profitability, pricing, production decisions, and progress toward covering fixed costs and reaching break-even. It can be calculated overall as total revenue minus variable costs, per unit by dividing that result by units sold, or as a contribution margin ratio by dividing contribution margin by revenue. Variable costs, such as materials and direct labor, rise or fall with sales and production, whereas fixed costs such as warehouse rent generally remain stable; correctly distinguishing between them is important for reliable analysis. Unlike gross profit margin, which considers all costs of goods sold to assess overall business performance, contribution margin provides a more product-level view. Businesses may use the metric to identify products that warrant price changes, cost reductions, or discontinuation, although these decisions should account for other KPIs and customer demand. Higher contribution margin ratios, particularly those nearer 100%, indicate a stronger ability to cover fixed costs and generate profit, and investors may also view consistently strong margins as evidence of effective financial management.

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