Over 60% of restaurants fail within their first three years, often due to poor cost control. Many restaurant owners work with estimates and gut feeling, which causes them to lose money without realizing it. Clear, simple calculation rules show you exactly where you stand and help you adjust faster.
Why simple calculation systems are so valuable
In a busy kitchen you don't have time for complicated Excel sheets or complex calculations. You need three things: fast, simple and accurate.
💡 Example:
You sell a pasta carbonara for €18.50 (incl. 9% VAT):
- Selling price excl. VAT: €16.97
- Ingredient costs: €5.10
- Food cost: 30.1%
With one simple formula you immediately see that this dish is profitable.
The benefits of simple calculations
Simple calculation systems offer concrete benefits for your daily operations:
- Quick decisions: You immediately see if a dish is profitable
- Fewer mistakes: Simple formulas are harder to mess up
- Daily control: Everyone on your team can handle the basic calculations
- Better overview: You don't need to be an Excel wizard to understand your numbers
⚠️ Note:
Complex systems only work if you actually use them. A simple system that you apply every day beats a perfect system that you abandon after a week.
The basic formulas you really need
For 80% of your cost price decisions you only need three formulas:
- Food cost: (Ingredient costs / Selling price excl. VAT) × 100
- Minimum selling price: Ingredient costs / (Desired food cost% / 100)
- Maximum purchase costs: Selling price excl. VAT × (Food cost% / 100)
💡 Example calculation:
You want a new pizza for €16.50 (incl. 9% VAT) with 28% food cost:
- Selling price excl. VAT: €16.50 / 1.09 = €15.14
- Maximum ingredient costs: €15.14 × 0.28 = €4.24
If your ingredients cost more than €4.24, the dish becomes too expensive.
How to implement this in practice
Start small and build gradually. Begin with your 5 top-selling dishes and calculate their actual food cost. That already gives you 80% of the insight you need.
- Week 1: Calculate food cost of your top sellers
- Week 2: Check prices with suppliers
- Week 3: Adjust menu prices where needed
- Week 4: Make this a weekly routine
💡 Real-world example:
Restaurant De Smaak checks 5 dishes every Monday:
- Steak: was 32%, now 35% (supplier raised price)
- Salmon: stable at 29%
- Pasta: increased to 31% due to more expensive cheese
Result: They adjusted 2 menu prices and maintained their margin.
Digital tools vs. manual calculations
Manual calculations work fine, but they're time-consuming. From tracking this across dozens of restaurants, I've seen that consistency matters more than the method you choose. A digital food cost calculator (like KitchenNmbrs) automatically calculates your food cost as soon as you enter ingredient prices. That saves you hours of calculation work each week.
The most important thing isn't how you calculate, but that you calculate. Consistency beats perfection every time.
How do you build a simple calculation system?
Start with your top sellers
Choose your 5 best-selling dishes and calculate their actual food cost. Add up all ingredients that go on the plate, including garnish and sauces.
Use one fixed formula
Always calculate food cost the same way: (Ingredient costs / Selling price excl. VAT) × 100. Write this down and don't use other formulas.
Do it weekly
Check the same 5 dishes every Monday. Suppliers regularly raise prices, so your food cost can change without you noticing.
✨ Pro tip
Track your 3 highest-volume dishes every Tuesday morning for 15 minutes. If any dish hits 33% food cost, you have exactly 2 weeks to adjust before it impacts your monthly profit.
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 calculate with prices including or excluding VAT?
Always excluding VAT for food cost calculations. Your menu shows prices including 9% VAT, but always divide by the price excluding VAT for accurate percentages.
What if my food cost fluctuates between 25% and 35% depending on the dish?
That's normal and expected. Fine dining dishes often run higher, while simple items like pasta can be lower. Focus on your average food cost across all dishes rather than individual percentages.
How do I handle seasonal price changes from suppliers?
Build a 2-3% buffer into your calculations during peak seasons. Update your calculations immediately when suppliers notify you of price changes, don't wait for your monthly review.
📚 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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