Gross margin subtracts cost of goods sold from revenue. Contribution margin subtracts only variable costs. They sound interchangeable — they are not, because COGS usually contains fixed production costs (factory rent, supervisor salaries, equipment depreciation) that variable costing deliberately leaves out.
Side by side
| Gross margin | Contribution margin | |
|---|---|---|
| Subtracts | COGS (incl. fixed production costs) | Variable costs only |
| Built for | External reporting, GAAP statements | Internal decisions |
| Answers | How profitably do we make our product? | What does one more sale contribute? |
Where the difference bites
A factory product sells at $100. COGS is $60 ($40 materials/labor + $20 allocated factory overhead) → gross margin 40%. Variable cost is only the $40 → contribution margin 60%. Now a one-off bulk order arrives at $55 per unit. Gross-margin thinking says reject (below $60 “cost”). Contribution thinking says the $20 overhead exists either way — the order adds $15 per unit toward those fixed costs. For incremental decisions, contribution is the honest lens; the full logic is in Contribution & Contribution Margin, Explained Simply.
Use each for its job
Gross margin for benchmarking, statements and trend analysis (margin calculator); contribution margin for pricing floors, break-even (calculator), discontinue-or-keep calls and sales-mix choices. Companies that price by gross margin alone routinely reject profitable business — and keep unprofitable products alive because overhead allocation flatters them.
Which is bigger, contribution or gross margin?
Usually contribution margin, because it excludes the fixed production costs that sit inside COGS.
Can I get contribution margin from financial statements?
Not directly — GAAP statements do not split costs by behavior. It requires internal data classifying costs as fixed or variable.
Which margin should set prices?
Contribution margin sets the floor (never below variable cost); gross and net margins check that total pricing covers everything, including overhead.