Real food cost per dish: how to calculate it with waste and yield
The food cost on paper is not always the food cost in the kitchen. Waste, yield and portions change the number. Here is how to calculate it right.
In this article
A costing sheet on paper can say a dish costs USD 4.50. The kitchen says something else: the product is cleaned, loses water, gets trimmed, and the same portion is not always served. Real food cost builds those losses in before you set the price.
The difference is not an accounting detail. If you price a dish on theoretical cost and your waste is high, you may be selling a dish that leaves less margin than you think.
The real food cost formula
You calculate real food cost in two steps:
Real cost = ingredient cost ÷ yield
Food cost = real cost ÷ selling price × 100
Yield is the percentage of product that reaches the plate after trimming, cooking and cuts. If you buy a kilo of protein and serve 850 grams, the yield is 85%.
You can also express it as waste:
Real cost = ingredient cost ÷ (1 − waste)
If waste is 15%, the divisor is 0.85. It is the same math under a different name.
A worked example
Suppose a dish with:
- Ingredient cost: USD 4.50.
- Waste and loss: 15%.
- Target food cost: 30%.
- Tax included in the menu price: 12%.
First, the real cost:
4.50 ÷ 0.85 = USD 5.29
Then, the price before tax:
5.29 ÷ 0.30 = USD 17.65
And the price with tax:
17.65 × 1.12 = USD 19.77
If the dish sells for USD 16, it is not covering the target food cost: margin is missing. If it sells for USD 21, the margin is higher, but you have to check that the guest perceives that value.
| Item | Calculation | Result |
|---|---|---|
| Ingredient cost | — | USD 4.50 |
| Yield | 100% − 15% | 85% |
| Real cost | 4.50 ÷ 0.85 | USD 5.29 |
| Price before tax | 5.29 ÷ 30% | USD 17.65 |
| Price with tax | 17.65 × 1.12 | USD 19.77 |
| Gross margin | 17.65 − 5.29 | USD 12.36 |
| Margin on price | 12.36 ÷ 17.65 | 70% |
Waste is not just “what you throw away”
Waste includes several losses that are worth separating:
- Trimming: skin, bones, leaves, scraps.
- Cooking: water that evaporates, fat that is lost.
- Portioning: differences between what should be served and what is served.
- Spoilage: product that is expired, badly stored or returned.
- Internal consumption: staff food that nobody records.
If you only measure what goes in the trash, you are missing half the problem. Weigh one production run for a week and compare what you bought with what you sold.
Theoretical vs. real food cost
Theoretical food cost comes from recipes and selling prices. The real one comes from inventory and purchases. The gap between the two is one of the most useful signals in your operation.
If theoretical is 30% and real is 35%, there are five points to explain:
- More waste than the recipe allows for.
- Bigger portions.
- Out-of-date supplier prices.
- Comps or discounts that nobody records.
- Theft, loss, or an inventory count done wrong.
Do not adjust the price before you understand the cause. Raising the price to offset waste that is out of control can scare guests away and will not fix the problem.
How to standardize a recipe
A recipe you can cost accurately has:
- Ingredients with a purchase unit and a usage unit.
- A gross quantity and a net quantity.
- Yield or waste for each ingredient.
- Exact portions.
- A procedure that does not change the yield.
- Supplier price with a date.
Weigh portions for a week. A kitchen learns more from a scale than from a speech about costs.
Common mistakes
1. Using an old supplier price
A recipe costed six months ago is out of date. Update prices at least once a month, or whenever a key ingredient changes.
2. Ignoring yield
Buying cheap is not always buying better. A product with 60% yield can cost more per serving than one with 85%.
3. Counting the tax twice
Keep the price before tax, the tax and the final price separate. If your menu shows tax-included prices, calculate the final price and compare it with what the guest actually pays.
4. Always rounding down
A dish priced at USD 19.77 that sells for 19.50 loses margin on every service. Set a rounding rule and review it.
5. Looking only at new dishes
Your best sellers are what move total food cost the most. Prioritize your top 10 by volume, not your 10 most creative.
A control routine
- Weekly: review purchases, waste and your best sellers.
- Monthly: close inventory, update prices and compare theoretical with real food cost.
- Quarterly: review recipes, yields and menu prices.
Calculate the price of a dish
The menu price calculator runs this math with your numbers: cost, waste, target food cost and tax. It gives you back the real cost, the minimum price and the margin.
If you want to see the impact on the whole operation, pair it with the prime cost calculator.
Frequently asked questions
What is a good food cost?
It depends on the concept. For full service, 28–35% is a reference range. What matters is that the price covers cost, waste and margin, and that the number is comparable month to month.
Should I include labor in food cost?
No. Food cost is food and beverage only. Labor is added in prime cost.
How do I calculate the waste in a recipe?
Weigh the product before and after trimming or cooking. The difference is the waste. Do it several times: a single measurement can be a coincidence.
How often should I update prices?
At least once a month, and every time a supplier changes an ingredient that carries weight on the menu.
