Creating a new dish is like building a house without checking if your foundation can support it. You're excited about the flavors and presentation, but mess up the cost calculations. Before you know it, you're serving dishes that lose money with every plate.
The 5 biggest calculation mistakes with new dishes
⚠️ Heads up:
One calculation error can make your new dish loss-making right away. Check these mistakes before you put it on the menu.
1. Calculating with price including VAT
The biggest trap: you calculate food cost using the menu price with VAT included. This makes your food cost appear lower than reality.
💡 Example:
New pasta, ingredient costs €7.50, menu price €24.50 incl. VAT
- Wrong: €7.50 / €24.50 = 30.6% food cost
- Right: €7.50 / €22.48 (excl. VAT) = 33.4% food cost
Difference: 2.8 percentage points too optimistic!
2. Calculating trim loss incorrectly
Fresh products always have waste from peeling, bones, or trimming. Most kitchens get this calculation backwards.
💡 Example:
Whole salmon €16/kg, 45% trim loss to fillet
- Wrong: €16 × 0.55 = €8.80/kg (way too cheap!)
- Right: €16 / 0.55 = €29.09/kg actual fillet price
You're calculating €20.29 per kilo too cheap
3. Forgetting garnish and side dishes
Many kitchens focus only on the main ingredient. But these extras add up fast:
- Sauces and dressings
- Garnish and decoration
- Oil, butter, salt, spices
- Bread or side dishes
💡 Example:
Steak with fries and sauce
- Steak 200g: €6.40
- Fries 150g: €0.45
- Pepper sauce: €0.80
- Butter, oil, spices: €0.35
Total: €8.00 (not €6.40!)
4. Estimating portion sizes
Without weighing, kitchens often underestimate portions. A generous cook can bump your cost price up 20-30% without realizing it.
⚠️ Heads up:
Weigh your portions the first week. A difference of 50 grams of meat costs you €520 per year at 100 portions per week.
5. No buffer for waste
New dishes create more waste: leftover mise-en-place, prep mistakes, or returned plates from customers who didn't like it.
Typical waste for new dishes: 8-15% of ingredient costs. From analyzing actual purchasing data across different restaurant types, new menu items consistently show higher waste percentages in their first month.
How do you prevent these mistakes?
Work systematically and you'll avoid most problems:
- Weigh everything - including spices and oil
- Calculate excl. VAT - always menu price / 1.09
- Add trim loss - divide by yield, don't multiply by loss
- Buffer 10% - for waste and unexpected costs
💡 Example complete calculation:
New risotto, menu price €19.50 incl. VAT
- Ingredients weighed: €5.80
- Waste buffer 10%: €0.58
- Total cost price: €6.38
- Selling price excl. VAT: €17.89
Food cost: 35.7% - on the high side, increase price to €21.50
Tools that help
Manual calculations lead to errors every time. A food cost calculator like KitchenNmbrs automatically handles your cost prices and flags food cost percentages that are too high.
You input ingredients and quantities, the system handles everything else. Including VAT corrections and trim loss calculations.
How do you calculate the cost price of a new dish? (step by step)
Weigh all ingredients exactly
Make the dish the way you want to serve it. Weigh each ingredient, including spices, oil and garnish. Write everything down in grams or milliliters.
Calculate the cost per ingredient
Work out what each ingredient costs per portion. Watch out for trim loss: divide purchase price by the yield percentage, don't multiply by loss.
Add everything up and add a waste buffer
Sum all ingredient costs. Add 8-12% for waste and unforeseen costs. This is your total cost price per portion.
Calculate food cost percentage
Divide cost price by selling price excl. VAT and multiply by 100. For restaurants you aim for 28-35% food cost.
Test during first week
Monitor portion sizes and waste. Adjust cost price if it turns out your chef gives larger portions or has more waste than expected.
✨ Pro tip
Track your actual vs. calculated costs for the first 3 weeks after launch. Weigh 10 random portions each week to catch portion creep before it kills your margins.
Calculate this yourself?
In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.
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Frequently asked questions
Should I include VAT in my cost price calculation?
No, always calculate with selling price excl. VAT. For restaurants that's menu price divided by 1.09. Otherwise your food cost looks lower than it actually is.
How do I calculate trim loss with fresh products?
Divide purchase price by yield percentage. With 30% loss you have 70% yield: €10/kg becomes €10 / 0.70 = €14.29/kg actual price.
What food cost is normal for new dishes?
Between 28-35% for restaurants. New dishes can temporarily run higher due to the learning curve, but aim for this range within 2-3 weeks.
Should I also count spices and oil?
Yes, everything that goes on the plate counts. Even a teaspoon of olive oil or pinch of salt. These 'small' costs can add up to €1-2 per portion.
What if my food cost is too high after launch?
Three options: raise the price, reduce portion size, or find cheaper ingredients. Often raising the price works better for new dishes than compromising quality.
How accurate should my portion weights be for costing?
Weigh to the nearest 5 grams for expensive ingredients like meat and fish. For cheaper items like vegetables, 10-gram accuracy is usually fine for reliable costing.
📚 Sources consulted
- EU Verordening 852/2004 — Levensmiddelenhygiëne (2004) — Official source
- EU Verordening 853/2004 — Hygiënevoorschriften voor levensmiddelen van dierlijke oorsprong (2004) — Official source
- EU Verordening 1169/2011 — Voedselinformatie aan consumenten (2011) — Official source
- NVWA — Hygiënecode voor de horeca (2024) — Official source
- NVWA — Allergenen in voedsel (2024) — Official source
- Codex Alimentarius — International Food Standards (2024) — Official source
- FSA — Safer food, better business (HACCP) (2024) — Official source
- BVL — Lebensmittelhygiene (HACCP) (2024) — Official source
- Warenwetbesluit Bereiding en behandeling van levensmiddelen (2024) — Official source
- WHO — Foodborne diseases estimates (2024) — Official source
Food Standards Agency (FSA) — https://www.food.gov.uk
The HACCP standards shown in this application are for informational purposes only. KitchenNmbrs does not guarantee that displayed values are current or complete. Always consult the FSA or your local authority for the latest regulations.
Written by
Jeffrey Smit
Founder & CEO of KitchenNmbrs
Jeffrey Smit built KitchenNmbrs from 8 years of hands-on experience as kitchen manager at 1NUL8 Group in Rotterdam. His mission: give every restaurant owner control over food cost.
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