The recipes you're food costing right now may have an issue — and it's hiding between the As-Purchased price and the Edible Portion that actually lands on a plate.
Most restaurant operators understand the basics of food costing. You buy ingredients, you build recipes, you calculate what each dish should cost. That number — the theoretical food cost — becomes your benchmark. It's the target you measure your actual performance against.
That apparently simple math is often much harder to get to due to inaccurate assumptions. The theoretical number is only as honest as the yield data behind it. And in most operations, the yield data is either a guess, a textbook number that doesn't reflect reality, or — worst of all — completely ignored.
The result? Your recipes look cheaper on paper than they actually are to produce. Your theoretical food cost is artificially low, and the gap between theoretical and actual widens into a variance that nobody can explain. Operators blame theft, waste, and over-portioning — and sometimes those are real problems — but often the root cause is much simpler:
the yield calculations were wrong from the start.
The Invisible Losses: Three Ingredients, Three Reality Checks
Let's walk through three common ingredients that live in virtually every commercial kitchen and look at where the yield assumptions may be innacurate.
Crushed Tomatoes — The #10 Can (100 oz / 2.84 L)A #10 can of crushed tomatoes is a workhorse ingredient. It goes into sauces, soups, braises — it's everywhere. Most operators cost it at face value: 100 ounces purchased, 100 ounces used. But that's not what actually happens.
What's left in the can.
Every can retains product. Crushed tomatoes cling to the sides and bottom. You're looking at 1–3% of the total volume that never leaves the can, depending on how thick the product is and how rushed the prep cook is. On a busy morning, nobody is scraping the can with a spatula.
Transfer loss. When that product goes from the can into a sixth pan or an insert for the reach-in, more stays behind — on the rim of the can, on the funnel or ladle used to transfer, on the lip of the container. Another 1–2% gone.
Container cleaning. When that insert is emptied later for service or the next batch, product clings to the walls and bottom of the container. It gets scraped into the garbage or rinsed down the drain. Another small loss, maybe 1%, but it's consistent.Add those up and you're realistically losing 3–5% of every can of crushed tomatoes before it even hits a recipe. Cost ten cases a week at full yield and you're quietly overstating your usable product every single period.
Eggs — A flat of 30 eggs seem simple. You buy 30, you use 30. Except you don't.
Breakage and cracks.
Between delivery, storage, and handling, 1–2 eggs per flat are commonly lost to cracks during transport or drops during service. That's 3–7% of the flat gone before anyone cooks anything. Some of those cracked eggs get used in scrambles or baking where it doesn't matter, but many just get tossed.
Broken yolks on the line. For any operation running sunny-side-up, over-easy, or poached eggs, yolk breaks are a fact of life. During a busy brunch, a cook might break 2–3 yolks per flat's worth of orders. Those eggs get re-cracked, and the broken ones go into a backup pan for staff meals or get discarded. Either way, the yield on eggs intended for intact-yolk preparations is lower than 100%.
Unrecorded egg wash. This is the silent killer. A prep cook whisks two or three eggs for an egg wash — breading cutlets, glazing pastry, sealing dough — and that wash is never counted against a recipe. It just disappears from inventory. Do that daily, and you're burning through an extra flat or two per week with no recipe to account for it.Realistic yield on a flat of eggs for a kitchen running breakfast and doing prep work with egg wash? Somewhere around 88–93%, not the 100% most operators assume.
Flour — The 20 kg BagFlour is one of those ingredients that operators rarely think about in terms of yield because it's dry and shelf-stable. But the losses are real, consistent, and almost entirely behavioral.
Spillage on opening and transfer.
Every time a 20 kg bag gets opened and poured into a bin or weighed out, flour escapes. It dusts the counter, the scale, the floor. It puffs into the air. Small amounts, but across a week of daily baking or pasta production, it adds up. Estimate 1–2% loss on transfer alone.
Counter dusting and over-sprinkling.
Every baker and pasta cook grabs a handful of flour to dust a work surface, a rolling pin, a bench scraper, a sheet pan. That flour is never measured and never counted against any recipe. It's invisible consumption — could easily be another 2–3% of the bag over the course of its use.
Over-measuring.
This is the one that nobody wants to admit but everybody does. A recipe calls for 100 grams and the scale reads 105 grams. Close enough. That 5% overage on every measurement doesn't seem like much, but when you're scaling a recipe that calls for 2 kg of flour, that's an extra 100 grams per batch. Over dozens of batches per week, the cumulative overage is significant.Realistic yield on a 20 kg bag of flour? Probably 92–95% of it actually ends up in a recipe at the correct measurement. The rest evaporates into the kitchen environment through completely normal, everyday use.
Do you think this is exaggerating wasteful habits of staff?
Good! I am glad you think that way. Now, prove me wrong! Do some casual over-shoulder investigating in your own kitchen. I mean watch people open cans, open bags, chekc the garbage, check the trim. Let me know what you find.
Flour — The 20 kg Bag.
Flour is one of those ingredients that operators rarely think about in terms of yield because it's dry and shelf-stable. But the losses are real, consistent, and almost entirely behavioral.
Spillage on opening and transfer.
Every time a 20 kg bag gets opened and poured into a bin or weighed out, flour escapes. It dusts the counter, the scale, the floor. It puffs into the air. Small amounts, but across a week of daily baking or pasta production, it adds up. Estimate 1–2% loss on transfer alone.
Counter dusting and over-sprinkling.
Every baker and pasta cook grabs a handful of flour to dust a work surface, a rolling pin, a bench scraper, a sheet pan. That flour is never measured and never counted against any recipe. It's invisible consumption — could easily be another 2–3% of the bag over the course of its use.
Over-measuring.
This is the one that nobody wants to admit but everybody does. A recipe calls for 100 grams and the scale reads 105 grams. Close enough. That 5% overage on every measurement doesn't seem like much, but when you're scaling a recipe that calls for 2 kg of flour, that's an extra 100 grams per batch. Over dozens of batches per week, the cumulative overage is significant.
Realistic yield on a 20 kg bag of flour? Probably 92–95% of it actually ends up in a recipe at the correct measurement. The rest evaporates into the kitchen environment through completely normal, everyday use.
From AP to EP: Getting the Yield Right
The fix is straightforward, but it takes discipline to get a system for the theoretical food cost to be consistently accurate each period.
Run actual yield tests.
Don't rely on textbook yields or supplier spec sheets. Weigh the product as it arrives (AP), process it the way your kitchen actually processes it, and weigh what you have left (EP). Do this three or four times per ingredient to get an average, because a single test can be skewed by one careful or careless employee.
Include all forms of loss.
A yield test that only measures trim and peel but ignores transfer loss, container residue, and measurement overages is still underestimating the true cost. Think about the ingredient's entire journey from delivery to plate.
Build the yield into your recipe costs.
Your costing tool should allow you to enter an AP cost and a yield percentage, and then calculate the EP cost automatically. If you're costing recipes using AP prices with no yield adjustment, every recipe in your system is wrong. This is exactly what the FoodCostChef Calculator's yield feature is designed to handle — converting AP pricing to true EP cost at the ingredient level, so every recipe that uses that ingredient reflects the real cost from the ground up. The theoretical food cost is an extension of this process.
Review yields seasonally.
Produce yields shift with the seasons. A case of local tomatoes in August has a different trim loss profile than hothouse tomatoes in February. Proteins vary by supplier and grade. Even dry goods like flour can vary in moisture content. Build a habit of re-testing your highest-volume ingredients at least quarterly.
If your theoretical and actual food costs don't align, the first place to look isn't the walk-in or the waste bin — it's your yield data. The invisible losses that happen between opening a package and plating a dish are real, measurable, and almost always underestimated.
Getting your AP-to-EP conversion right doesn't just improve the accuracy of individual recipes. It resets your entire theoretical food cost to a number that actually reflects reality — a number you can trust when you're analyzing variance, engineering your menu, and making pricing decisions.
Because a theoretical food cost that's built on fantasy yields isn't a benchmark. It's a fiction.And in a future post, we'll show you how to take those accurately costed recipes and calculate your true blended theoretical food cost based on what you're actually selling — the number that tells you exactly where your overall food cost should be.
Ready to get your yield calculations right?
The FoodCostChef Calculator builds EP costing directly into every ingredient, so the math flows through to every recipe and every plate automatically. No subscription. No monthly fees. Just accurate numbers you own.
