Waste-adjusted margin
Waste adjusted food cost shows how much of your sales went into sold, wasted, and comped food. Waste-adjusted margin is the share left after those ingredient costs.
Waste-adjusted food cost calculator
Enter one item's service totals. Count paid sales, free comps, and discarded portions separately. Usable leftovers saved for later are not waste.
- Theoretical margin
- 70.0%
- Waste-adjusted margin
- 59.1%
- Waste-adjusted food cost
- 40.9%
- Food-cost margin ($)
- $364.00
Sales: $616.00 · Ingredients consumed: $252.00 · Usable leftovers: 0 portions.
Food cost = (sold + comped + wasted) × ingredient cost. Revenue = sold × selling price. Assumes paid portions sell at full price; excludes tax, labor, fuel, event fees, processing, and other overhead. This is food-cost margin, not take-home profit.
From recipe margin to a service's food-cost margin
Theoretical margin subtracts a plate's recipe cost from its selling price, then divides by that price. It is the number on a costing spreadsheet and inside costing software. It answers: if this plate sells at full price, what does it earn?
Waste-adjusted margin subtracts the ingredient cost of sold, wasted, and comped portions from net sales, then divides by net sales. It answers: how much of this item's revenue remained after food cost last night?
theoretical margin = (price − unit cost) ÷ price
waste-adjusted margin = (revenue collected − ingredients consumed) ÷ revenue collected
On a truck the two can diverge fast when prep has a short shelf life. Record what was actually discarded; usable leftovers carried into another service are not waste. These are food-cost margins, before labor, fuel, event fees, and other overhead.
How to calculate waste-adjusted food cost
Theoretical food cost is recipe cost ÷ menu price. Waste-adjusted food cost uses the same service-level inputs as waste-adjusted margin, but shows the share spent on food instead of the share left over. Use net sales after discounts and refunds, excluding tax and tips, and count sold, wasted, and comped portions separately.
food cost dollars = (sold + wasted + comped portions) × recipe cost per portion
waste-adjusted food cost % = food cost dollars ÷ net sales × 100
waste-adjusted margin % = 100% − waste-adjusted food cost %
The portion formula assumes each portion uses the same recipe quantity. Ingredient trim or cooking loss already included in your recipe yield should not be added again as service waste. When net sales are zero, the percentage is undefined; inspect the food cost in dollars. Costs above net sales produce a food-cost percentage above 100% and a negative margin.
A 70.0% item that made 59.1%
One booking, one item. The 60 prepped portions include the 3 comps; all 13 remaining portions are discarded in this example. Every portion is counted once.
| Menu price | $14.00 |
| Recipe cost per portion | $4.20 |
| Theoretical margin | 70.0% |
| Portions prepped | 60 |
| Portions sold | 44 |
| Portions comped | 3 |
| Portions wasted | 13 |
| Revenue collected | $616.00 |
| Ingredients consumed (60 portions) | $252.00 |
| Theoretical food cost | 30.0% |
| Waste-adjusted food cost | 40.9% |
| Waste-adjusted margin | 59.1% |
The recipe card says this item earns 70.0%. It earned 59.1%. Food cost rose from 30.0% to 40.9%: $252.00 of ingredients against $616.00 of sales. Of 60 prepped portions, 44 sold, 3 were comped, and 13 were wasted. That is the difference a recipe card alone cannot show.
This example is illustrative — the figures are chosen to show the arithmetic, not taken from a customer's books.
Four things theoretical margin can't see
Prep waste
You prepped 60 portions, sold 44, comped 3, and binned 13. Those 13 wasted portions cost ingredients but earned nothing — and theoretical margin never sees them.
Early sellouts
Selling out at 7:15 may mean missed demand. GriddleMath records early sellouts to inform prep recommendations; hypothetical lost sales are not deducted from the food-cost margin calculation.
Comps and staff meals
Every comped plate carries full food cost at zero revenue. A handful a night is a real percentage point off a truck's margin.
Moving ingredient prices
The recipe card you costed in spring is not the recipe you're cooking in autumn. Margin drifts down quietly between the times anyone re-checks it.
Two data sources, and one of them takes two minutes
Half the inputs already exist. Your Square sales supply what sold, at what price, at which location. Your recipe costs supply what each portion consumed.
The other half is the part no POS can know: what you prepped, what was left over, what got comped, and what sold out before close. That is the whole closeout — four numbers per item, on a phone, with the sold quantities already filled in from Square. It is deliberately the shortest form that still produces an honest number, because a closeout that takes ten minutes doesn't get filled in on a Saturday night.
From there it is arithmetic, run per item per booking, and rolled up so you can compare the same item across trucks, event types, and weeks. See it applied to a whole menu in menu costing, or check what connects in integrations.
Waste-adjusted food cost and margin FAQ
What is waste-adjusted margin?
Waste-adjusted margin is net sales minus the ingredient costs of sold, wasted, and comped portions, divided by net sales. Theoretical margin is selling price minus recipe cost, divided by selling price. Both measure food-cost margin, excluding labor and other overhead.
How do you calculate waste adjusted food cost?
Add the ingredient costs of sold portions, recorded waste, and comps, then divide by net sales and multiply by 100. Subtract that food-cost percentage from 100% to get waste-adjusted margin. Count each portion once; usable leftovers saved for a later service are not waste. With zero net sales the percentage is undefined, even though ingredient cost still exists.
How is waste-adjusted food cost different from theoretical food cost?
Theoretical food cost is the recipe-card number: ingredient cost divided by menu price. Waste-adjusted food cost is total ingredients consumed divided by total revenue collected for that item across a service. On a truck the gap between the two is usually widest on high-prep proteins and anything with a short shelf life.
How does GriddleMath know what I wasted?
Your POS tells us what sold. The two-minute closeout tells us the rest — what you prepped, what was left, what got comped, and what sold out. That is the smallest set of numbers that makes the calculation honest, which is why the closeout asks for those and nothing else.
Isn't this just food cost variance?
It is closely related. Multi-unit restaurant software calls it actual-versus-theoretical and computes it from inventory counts over a period. A truck does not run periodic inventory counts, and a booking is a one-shot bet on prep with no second service to absorb a bad call. GriddleMath computes it per item per booking, from a closeout an operator can finish standing next to the truck.
What do I do once I can see it?
Three things, in order: cut prep on items that consistently waste, re-price items whose waste-adjusted margin sits below target, and prep more of anything that sells out early at a healthy margin. GriddleMath turns each of those into a specific recommendation with the numbers behind it.