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Food cost fundamentals

The core math: percentages, plate costs, and the mistakes that quietly cost four points of margin.

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Terms these guides define

COGS (cost of goods sold)
The cost of the food and beverage actually consumed in a period, computed from inventory rather than from purchases.
Yield percentage
Usable ingredient weight divided by starting weight, expressed as a percentage for a specified preparation step.
Trim loss
The weight removed during preparation — the difference between what you bought and what you can cook.
Edible portion vs. as-purchased
As purchased (AP) describes food in the form you buy it; edible portion (EP) describes the usable amount after a specified preparation step.
Food cost percentage
The share of a dish's menu price consumed by the ingredients on the plate.
Prime cost
Total cost of goods sold plus total labor cost — the two numbers that decide whether a restaurant survives.
Ideal food cost
The food cost percentage your menu would produce if every plate were made exactly to spec and nothing was wasted.
Contribution margin
The dollars a dish contributes to overhead and profit after its ingredient cost — menu price minus plate cost.
Plate cost
The total ingredient cost of one served portion, garnish and sides included.
Q factor
A per-plate allowance for the small unbilled items — oil, butter, salt, bread service — that never make it onto a recipe card.
Theoretical vs. actual food cost
Theoretical is what the recipes say you should have spent; actual is what inventory says you did. The gap is the whole story.
Variance
The dollar gap between theoretical and actual food cost — the money that left without a sale.
Shrinkage
Inventory that disappears without a corresponding sale — waste, spoilage, error and theft combined.
Sub-recipe
A recipe used as an ingredient in other recipes — stock, sauce, dough, compound butter.
Portion control
Keeping served portions equal to specced portions — the difference between the food cost you calculated and the one you get.
Waste percentage
The share of purchased food that is thrown away rather than sold — spoilage, overproduction, errors and returns.
Comps
Food or drink given away — recovery, staff meals, promotions — real cost with no matching revenue.
Price creep
Small, frequent supplier price increases that individually look ignorable and collectively remove several points of margin a year.
Invoice reconciliation
Checking that what you ordered, what arrived, and what you were billed are the same three things.
Spoilage
Product lost to age, temperature or damage before it could be sold.