Reformulating a wasteful dish can dramatically boost your profit margins. The calculation is straightforward: compare your old cost price against the new one. This side-by-side analysis reveals exactly how much extra profit each plate delivers.
What is a wasteful dish?
A dish qualifies as wasteful when:
- Food cost exceeds 35%
- Ingredients get tossed regularly
- Customers consistently leave food on plates
- Mise-en-place becomes a planning nightmare
⚠️ Note:
Waste hides everywhere. Not just in your trash bin, but also in oversized portions and ingredients that spoil quickly.
Calculate the old situation
Start by calculating your current margin per dish. Add up every cost:
- Ingredient costs per portion
- Waste costs (estimated percentage)
- Hidden costs (oil, butter, garnish)
💡 Example old situation:
Pasta with fresh truffles - selling price €32.00 incl. VAT:
- Selling price excl. VAT: €29.36
- Ingredients: €12.50
- Truffle waste (20%): €2.50
- Total costs: €15.00
Food cost: 51.1% - way too high!
Calculate the new version
Reformulate the dish and calculate your new cost price. Consider these changes:
- Swap expensive ingredients for smarter alternatives
- Reduce portions where it makes sense
- Choose ingredients with longer shelf life
- Streamline your preparation method
💡 Example new version:
Pasta with truffle oil and mushrooms - same selling price €32.00:
- Selling price excl. VAT: €29.36
- Ingredients: €8.50
- Waste (5%): €0.43
- Total costs: €8.93
Food cost: 30.4% - much better!
Calculate the difference
Subtract your old margin from the new margin per dish:
New margin - Old margin = Extra profit per plate
💡 Calculation difference:
- Old margin: €29.36 - €15.00 = €14.36
- New margin: €29.36 - €8.93 = €20.43
- Difference per plate: €20.43 - €14.36 = €6.07
Extra profit: €6.07 per dish!
Impact on an annual basis
From analyzing actual purchasing data across different restaurant types, multiply your extra profit per plate by annual sales volume:
Extra profit per year = Difference per plate × Number sold per year
💡 Annual impact:
If you sell this dish 3 times per week:
- Per week: 3 × €6.07 = €18.21
- Per year: €18.21 × 52 = €946.92
Almost €1,000 extra profit per year on one dish!
What if you adjust the selling price?
Sometimes reformulating allows you to lower the price and sell more. Or raise it if quality improves.
⚠️ Note:
Always test with a small guest group before making permanent changes. Taste and presentation must stay at least as good.
Keeping track digitally saves time
Doing these calculations manually eats up hours. A system like KitchenNmbrs instantly shows your food cost per dish and lets you compare different versions side by side.
How do you calculate the margin improvement? (step by step)
Calculate the old cost price including waste
Add up all ingredient costs and estimate the waste percentage. Common is 5-15% extra on top of ingredient costs for waste.
Design the new version and calculate that cost price
Replace expensive or wasteful ingredients with smarter alternatives. Calculate the new total cost price per portion.
Subtract the margins from each other for the difference per plate
New margin minus old margin gives you the extra profit per dish. Multiply this by your sales numbers for the annual impact.
✨ Pro tip
Start by reformulating your 2 highest-volume dishes within the next 30 days. Even a 5% cost reduction on high-volume items delivers more profit than perfecting low-sellers.
Calculate this yourself?
In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.
Was this article helpful?
Frequently asked questions
How do I estimate the waste percentage of a dish?
Track for a week how much you throw away from the main ingredients. Divide this by your total purchase of those ingredients. Common waste ranges from 5-15%.
What if guests like the new version less?
Test first with a limited group of guests. You can also temporarily offer both versions to see which one sells better.
Should I recalculate margins for seasonal menu changes?
Absolutely. Seasonal ingredients fluctuate in price dramatically, sometimes by 40-60%. Recalculate every time you source from different suppliers or change seasonal items.
📚 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.
Make food waste measurable and manageable
Every kilo you throw away is lost margin. KitchenNmbrs connects your inventory to your recipes so you can see exactly where waste occurs — and how much it costs. Try it free.
Start free trial →