Food cost percentage is the single most-watched number in restaurant finance, and it starts at the plate level — every dish, priced ingredient by ingredient, at the actual portion size that goes out the kitchen door. This tool builds that number from the ground up: list what's on the plate, see the cost, see the percentage, see the margin.
How plate cost is calculated
Add up the cost of every ingredient at the portion size actually used in the recipe — not the cost of a whole case of ribeye, but the cost of the 10oz portion that lands on the plate. Divide that total by your menu price and you get food cost percentage. Subtract the cost from the menu price and you get gross profit dollars per dish; divide that by menu price for gross margin percentage.
The two numbers that matter most for day-to-day decisions are food cost percentage (is this dish priced sustainably) and gross profit dollars (is this dish actually making you money, since a low-food-cost-percent item can still generate less profit than a higher-percent item with a bigger price tag).
Why flat, generic food cost tools miss the point
Plenty of free recipe costing tools exist, and most of them do this one calculation correctly in isolation. Where they fall short is treating each dish as a standalone question, disconnected from everything else happening in the business — supplier price swings, seasonal ingredient availability, and the menu-wide pricing strategy that a single plate cost number can't capture on its own.
A dish costed once at open and never revisited drifts out of target range the moment a supplier raises prices — which is common, not rare. The plate cost number is only useful if it's part of a routine, not a one-time exercise.
Worked example
A 10oz ribeye plate: $6.50 for the protein, $0.45 for butter and aromatics, $1.20 for a starch and vegetable side. Total ingredient cost: $8.15. At a $28 menu price, that's a 29.1% food cost — solidly inside the typical 28-35% target range — and $19.85 in gross profit per plate, a 70.9% gross margin.
Compare that to a $12 pasta dish costing $2.40 in ingredients: a 20% food cost, which looks better on paper, but only $9.60 in gross profit per plate — meaningfully less than the ribeye in absolute dollars, even with a much lower percentage. Food cost percentage and dollar profit can point in different directions, and menu strategy needs both.
Common mistakes and benchmarks
- Costing the recipe, not the portion. A recipe that yields 8 servings needs its ingredient costs divided by 8 — costing the whole batch and dividing by menu price for one plate wildly understates true food cost.
- Ignoring yield loss.A case of produce isn't 100% usable product — trim, peel, and cook loss all reduce usable yield below purchase weight, which understates true per-portion cost if ignored.
- Costing once and never again.Run this again whenever a key ingredient's price moves — the supplier price impact calculator is built specifically for modeling that shift before it erodes margin unnoticed.