The numbers on your menu:
cost it, price it, watch it.

Why it is no longer optional

Roger Beaudoin runs Restaurant Rockstars and works with operators every day. His line for the current price moment: “You can't afford not to know what it costs you to serve every single item to every single guest.”²

The mistake he finds most: people know their ingredient prices but not what labor and overhead weigh on top. He calls that a mistake, and it is where his costing class starts.⁴

The plate, piece by piece

The method is reverse engineering, and it starts at the invoice: your supplier order guides or your invoices give you the cost per unit or per ounce of each ingredient, and from there the cost of each recipe.⁶

The example broken down, a pizza: eight ounces of dough at two cents an ounce, four ounces of cheese at 18 cents an ounce and 1.6 ounces of bacon at 38 cents an ounce. Add up every ingredient and that total is the plate cost.¹²

Two details that change the number: the real yield of the product, meaning how much comes out of each purchase, and takeout packaging, which enters the cost when the dish leaves the building.⁴¹²

The final count of the example: the ingredients added up to $2.80. At an $18 menu price the food cost came out at 16%.⁵

The inventory equation

This is the formula that organizes everything, and it comes from accounting, not the kitchen: beginning inventory plus purchases minus ending inventory equals usage. Usage divided by food sales for the period gives you your cost percentage.¹

The detail that distorts the numbers: last month's leftover. Fred Langley, CEO of Restaurant Systems Pro, explains it with a five-gallon container: if that product is still on your shelf and you do not count it, your usage looks inflated, as if you had used it without selling it.⁸

The fine version connects recipes to the point of sale: every recipe tied to a button. If you sold ten soups, the system knows how much raw material you should have used and compares it against what left the storeroom.⁹

Prime cost: the number that decides

Food plus beverage plus labor, all as a percentage of sales. That is prime cost and, in Roger's words, it “determines whether or not you're making money in your restaurant.”¹

His example: 32% food cost plus 22% beverage cost makes 54%. Averaged, that is 27%. Add 32% labor and prime cost lands at 59%.⁷

What it means: out of every dollar sold, about half goes there before rent, insurance, utilities and maintenance. That is why he reviews it weekly, not quarterly.²

Yorgo, an operator with decades in large chains, puts it just as bluntly: the two main costs take “sometimes 50, 52, 55, 56, 60% of what you bring in,” and labor accelerated by double digits in about two years.¹¹

Another use of the same number: compare sales volume against the profit of each dish, category by category. His benchmark: expensive items should sit within a dollar of profit of each other, and cheap ones within 50 cents. That way it does not matter which one sells more.¹⁰

The whole case, live

To see all of this applied end to end we built a single-location demo pizzeria: the standard cost of its medium pepperoni, week-by-week leakage, menu engineering and a price experiment, with the math in the open. The same logic as this article, over a full menu.

Public case: Forno Demo, a single-location pizzeria (fictional brand, reusable template).