Gross Margin

Gross margin is a profitability metric used in retail and e-commerce that measures the share of revenue remaining after the cost of goods sold is subtracted. It is typically expressed as a percentage and reflects how much of every sales dollar contributes to covering operating expenses and producing profit before other costs are considered.

The purpose of gross margin is to show how efficiently a business converts product sales into gross profit. Retailers use it to compare categories, evaluate individual SKUs, benchmark against competitors, and set targets for pricing, sourcing, and promotion. A category with a steady 40% gross margin and another with 15% can generate similar revenue but very different bottom-line contribution, which shapes assortment, shelf space, and promotional investment decisions. For a foundational definition, see Investopedia’s article on gross margin.

Gross margin is calculated as (Revenue − Cost of goods sold) ÷ Revenue × 100. For example, if a retailer sells a product for $100 and the cost of goods sold is $60, gross profit is $40 and gross margin is 40%. The same retailer selling a different product at $100 with a cost of $85 would post a gross margin of 15%. Tracking this ratio at the product, category, and channel level exposes where value is really being created.

In ecommerce and retail, gross margin is the foundation of nearly every pricing decision. It sets the floor for markdown pricing, guides promotional depth, informs negotiations with suppliers, and signals when a product needs repositioning. Eroding margins often appear first at the SKU level before they show up in the P&L, which is why continuous monitoring and rules-based controls matter.

Six ways gross margin can impact pricing:

1. Setting price floors: Target margins translate into minimum acceptable selling prices, protecting profitability on every transaction.
2. Guiding promotions: Knowing the gross margin on each item tells merchandisers how deep a discount can go before the product loses money.
3. Shaping assortment: Higher-margin categories receive priority in space, marketing, and inventory investment.
4. Informing sourcing: Falling gross margins may signal the need to renegotiate with suppliers or find alternative sources.
5. Comparing channels: Gross margin by channel reveals which sales paths are genuinely profitable and which are just busy.
6. Feeding price optimization: AI-driven tools use gross margin as a core input when recommending prices that balance volume and profitability.