The definitions depend on cost classification
Gross margin usually subtracts product-related cost of goods from net sales. Contribution margin goes further by subtracting variable costs required to generate and fulfill the order. Define the formula used in your business before comparing results with another seller or report.
Use each metric for the right decision
- Use gross margin to review sourcing, manufacturing, and product-cost changes.
- Use contribution margin to review price, advertising, promotions, and fulfillment choices.
- Use operating profit after shared expenses to judge the sustainability of the whole business.
Do not hide variable costs in overhead
If a cost rises with orders or units, keeping it only in a monthly overhead bucket makes SKU contribution look stronger than it is. Map traceable selling, fulfillment, promotion, and return costs to the products that create them.
Label every dashboard clearly
State the numerator, denominator, and included costs near the metric. A percentage called simply margin can lead two teams to make opposite decisions because they are using different definitions.