Contribution Margin

Contribution margin is the dollar amount each item contributes to fixed costs and profit, after subtracting its variable cost. For a restaurant, the variable cost on a dish is mostly the food and direct labor of preparation; everything else (rent, management, utilities) is fixed.

Contribution margin is what menu engineering optimizes. A $24 entrée with a $7 food cost has a $17 contribution margin per cover. A $14 pasta with a $3 food cost has only $11 contribution margin — so even though pasta has lower food cost percentage (21% vs 29%), the entrée contributes more dollars per sale.

The right metric to optimize for is contribution margin in dollars per cover, not food-cost-percentage. A 22% food-cost item that sells for $9 contributes $7. A 32% food-cost item that sells for $28 contributes $19. The expensive-ingredient item is the better one to push.

Contribution margin should be tracked at the item level (which dishes contribute most), the day-part level (which meal periods are most profitable), and the cover level (average ticket size ÷ variable cost per cover). The three views together are the core of restaurant unit economics.

Restaurant operators who optimize for food-cost-percentage rather than contribution margin make the wrong call again and again — they push cheap items because the percentage looks good, while the big-ticket items quietly drive most of the actual profit. Contribution margin is the right north star for menu and pricing decisions.