Plate Cost Calculator — Cost Per Serving

Plate cost is the total cost of every ingredient that ends up on a guest’s plate for a single serving of a dish. It is the most fundamental number in restaurant finance because every other calculation — food cost percentage, contribution margin, menu pricing, profitability — depends on it being accurate. Get plate cost wrong and everything downstream is wrong too.

Most operators underestimate plate cost because they forget about trim waste, cooking shrinkage, sauce, garnish, oil, and the side that “comes with” the entree. Here is how to calculate it properly.

The Plate Cost Formula

For each ingredient on the plate, calculate what that specific portion costs you. Then sum everything up.

Ingredient Cost Per Serving = (Purchase Price ÷ Package Yield) × Portion Size

Example: Grilled Salmon Entree

Ingredient	Purchase	Portion	Cost
Salmon fillet	$12.80/lb	7 oz (raw)	$5.60
Asparagus	$3.60/bunch (1 lb)	4 oz	$0.90
Rice pilaf	$1.80/lb (dry)	3 oz dry	$0.34
Lemon butter sauce	Batch: $4.20 / 16 servings	2 oz	$0.26
Olive oil (cooking)	$18/gal (128 oz)	0.5 oz	$0.07
Lemon wedge + herbs	Various	Garnish	$0.15
Salt, pepper, seasonings	Various	Pinch	$0.08
Total Plate Cost			$7.40

If this salmon sells for $28, the food cost percentage is $7.40 ÷ $28 = 26.4%. That is well within the healthy range. But notice how the small items — oil, garnish, seasoning — add up to $0.30. Skip those in your calculation and you underestimate plate cost by 4 percent. Over 100 servings a week, that $0.30 omission is $1,560/year.

Accounting for Trim and Cooking Yield

Raw protein weight is not the same as plated weight. A whole salmon fillet has skin, pin bones, and belly fat that you trim before cooking. A 1 lb fillet might yield 13 oz of usable portions after trimming — an 81 percent yield. Then cooking shrinks it further: grilled salmon loses about 15 percent of its weight to moisture loss. So 13 oz raw becomes roughly 11 oz cooked.

If you want 6 oz of cooked salmon on the plate, work backward:

Raw purchase needed = Plated weight ÷ Cooking yield ÷ Trim yield

6 oz ÷ 0.85 ÷ 0.81 = 8.7 oz raw purchase

At $12.80/lb ($0.80/oz), you need to cost 8.7 oz, not 6 oz. That is $6.96 instead of $4.80 — a 45 percent difference. Operators who skip yield calculations systematically underestimate their true food cost on every protein-centered dish.

Common Plate Cost Mistakes

Forgetting cooking oil and butter. A tablespoon of butter on every steak at $5.40/lb costs $0.22 per plate. Across 200 steaks/week: $2,288/year.
Ignoring the “free” bread basket. A bread basket with butter costs $0.60 to $0.90 per table. At 40 tables/night, that is $9,000 to $13,000/year — and it shows up nowhere in per-item plate costs.
Using purchase weight instead of yield weight. As shown above, trim and cooking loss can add 30 to 50 percent to your effective protein cost. Always calculate from yield, not raw purchase weight.
Not updating costs when suppliers raise prices. A $0.60/lb increase on chicken affects every dish that uses chicken. Recalculate plate cost every time you receive an invoice with changed pricing.

From Plate Cost to Menu Price

Once you have an accurate plate cost, use it to set your menu price. Divide by your target food cost percentage. If plate cost is $7.40 and you target 28%, minimum price = $7.40 ÷ 0.28 = $26.43, rounded to $26 or $27. Then validate against your competition and perceived value. See our complete menu pricing guide and food cost formula reference for every calculation in this chain.

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