Definition
Contribution margin is revenue minus the variable costs (cost of goods, shipping, fees, returns). It's the amount each order contributes toward covering fixed costs and creating profit.
Also called: Contribution Margin, CM, Gross profitFollow the sale through to contribution.
Same revenue. A different contribution margin changes what you can afford to spend.
01Sales value does not tell you how much is left.
Why contribution margin is the foundation
Every profit-based metric — POAS, CLTV, break-even ROAS — is built on contribution margin. If you don't know your margin per product, you can't know what an order is really worth, and then all your bidding is a guess.
Contribution margin comes in layers: CM1 (after cost of goods), CM2 (also after shipping and fees), and beyond. The further out you calculate, the closer you get to the true profit per order.
From contribution margin to bid management
Once margin is mapped per product, it can be fed into the ad platforms via tools like Profitmetrics. Then Meta and Google bid on actual profit. The expensive-but-high-margin products get the budget they deserve, and the cheap-but-low-margin ones are kept on a short leash.
It's the difference between optimizing toward a number on a screen and optimizing toward the money in the bank.
CM1, CM2, CM3 — layer by layer
Contribution margin isn't one number but a staircase. CM1 is revenue minus cost of goods (the pure product margin). CM2 subtracts the order-dependent costs — shipping, packaging, payment fees, expected returns. CM3 can go further and subtract the direct marketing costs attributable to the product. The further down the staircase you calculate, the closer you are to the true profit per order.
It sounds pedantic, but the difference is often decisive. A product can have a great CM1 and a dismal CM2 because it's big, heavy and returned often. And that's exactly the product a revenue-optimized campaign loves to sell most of. Without the CM2 view, you bid hardest on what earns least.
In practice it's CM2 (or closer to CM3) that should be fed into the ad platforms as conversion value. Then Meta and Google bid on the real contribution, not on a gross margin that looks better than reality.
Frequently asked questions
Is contribution margin the same as profit?
No. Contribution margin is what's left after variable costs but before fixed costs like salaries, rent and subscriptions. Profit is what's left once the fixed costs are also subtracted.
What is break-even ROAS?
The ROAS at which contribution margin exactly covers the ad cost. It's 1 divided by your margin — at a 40% margin, break-even ROAS is 2.5.
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About the author
Nicklas Segatz Mortensen
Growth hacker and fractional CMO with 10+ years' experience and hundreds of millions in managed ad spend behind him. Background from larger Danish and international scale-ups, and from the agency world.
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