The variable economics of each sale
Contribution margin is revenue minus all variable costs, showing how much each sale contributes toward fixed costs and profit. It isolates the part of the economics that scales with volume. Where gross margin subtracts only the direct cost of delivering the product, contribution margin subtracts every cost that grows with each additional sale, variable selling, payment processing, volume-scaled support. The result answers a sharper question: after everything that grows when you sell one more, how much is left to cover fixed costs and become profit.Where it sits between the other margins
Contribution margin occupies the middle of the margin stack, and knowing which margin you are using prevents bad conclusions.
| Margin | Subtracts | Answers |
|---|---|---|
| Gross margin | Direct delivery cost | Is the product profitable to deliver? |
| Contribution margin | All variable costs | What does each incremental sale contribute? |
| Net margin | Everything, including fixed | Is the whole business profitable? |
Why it drives growth decisions
Contribution margin is the number that tells you whether scaling actually pays. Because it reflects the true incremental economics, it answers whether a segment, channel, or product line is worth expanding: a high contribution margin means each additional sale meaningfully funds fixed costs and profit, while a thin one means growth adds revenue without adding much to the bottom line. It is central to unit economics and pairs directly with customer acquisition cost, since the contribution from a customer over their lifetime, set against the cost to acquire them, is what determines whether the growth is profitable. A company that decides where to invest without knowing its contribution margin by segment is scaling on revenue alone, which is how businesses grow their way into losing money.
Frequently Asked Questions
What is contribution margin?
Contribution margin is revenue minus all variable costs, the costs that scale with each additional sale, expressed as a dollar amount or a percentage of revenue. It shows how much each sale contributes toward covering fixed costs and generating profit. Unlike gross margin, it subtracts variable selling and delivery costs beyond just cost of goods sold.
How is contribution margin different from gross margin?
Gross margin subtracts only the direct cost of delivering the product. Contribution margin goes further and subtracts all variable costs, including variable selling, payment processing, and support that scales with volume. Contribution margin is therefore usually lower than gross margin, and it more fully isolates the variable economics of each incremental sale.
Why does contribution margin matter?
Because it shows the true incremental economics of growth. It answers how much each additional sale actually contributes after all the costs that grow with it, which is what determines whether scaling is profitable. It is central to unit economics and to deciding whether a segment, channel, or product line is worth expanding.
Put these metrics to work
ORM builds custom revenue forecast models that turn concepts like contribution margin into prescriptive action for your team.
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