A system is only as good as the data you put into it. Many restaurant owners think an app will automatically solve their problems, but forget that they remain responsible for correct data entry. If you put in garbage, you get garbage out - even with the best software.
The system is just a calculator
KitchenNmbrs, Excel, or any system - they're all calculators. They take your numbers and calculate with them. If you enter an ingredient price of €5 per kilo when you actually pay €8, then your food cost calculation won't be correct. The system can't guess what you really pay.
💡 Example:
Your input in the system:
- Beef tenderloin: €25 per kilo
- Portion: 200 grams = €5.00
- Selling price: €28.00 excl. VAT
Calculated food cost: 17.9%
But you actually pay €32 per kilo due to price increases...
Actual food cost: 22.9% - much higher!
Why your data often doesn't match
There are three main reasons why the numbers in your system don't match reality:
- Outdated prices: Your supplier raised their prices, but you haven't updated them
- Forgotten costs: You only calculate the main ingredient but forget garnish, sauces, and oil
- Estimated quantities: You think your chef uses 180 grams of meat, but he gives 220 grams
⚠️ Note:
A system doesn't automatically warn you about outdated prices. You need to actively track what you actually pay.
The responsibility stays with you
Many entrepreneurs think: "I have an app now, so my food cost is automatically correct." That's not true. The system only calculates what you enter. If you:
- Don't measure and record temperatures, you have no HACCP registration
- Don't update prices, your cost prices won't be correct
- Don't check portions, your calculations are worthless
💡 Example of wrong expectations:
"I've been using KitchenNmbrs for 3 months, but my profit hasn't increased."
Possible causes:
- Ingredient prices not updated since setup
- Portion sizes estimated instead of weighed
- No action taken based on the insights
The system showed the correct calculation, but the input wasn't right.
How many times do you have to explain this?
In practice, you encounter this misconception constantly. Every time someone complains that "the system doesn't work," it's actually a data problem. You need to explain this:
- During onboarding: Explain right away that they're responsible for correct data
- When answering support questions: "My food cost isn't right" → First check the entered prices
- In reviews/feedback: Negative reviews often come from wrong expectations
- In marketing: Be honest about what the system can and can't do
⚠️ Note:
The better you explain this upfront, the less frustration later. Managing expectations is crucial for customer satisfaction.
Creating the right mindset
The goal isn't to scare people away, but to set the right expectations. A system like KitchenNmbrs makes calculations faster and prevents math errors. But you remain responsible for:
- Entering current prices
- Checking actual portions
- Adding new ingredients
- Taking action based on the results
💡 Example of right expectations:
"KitchenNmbrs automatically calculates my food cost once I've entered the correct ingredient prices and quantities. It saves me time and prevents math errors, but I need to make sure my data is correct."
That's how you use the system as intended.
How do you ensure reliable data? (step by step)
Update prices monthly
Check your supplier invoices every month and compare them with the prices in your system. Update anything that differs by more than 5%. This keeps your cost price calculations current.
Check portion sizes weekly
Weigh a few plates of your most popular dishes randomly. If your chef consistently gives more than what's in the system, adjust your recipes accordingly.
Compare system with reality
Take your calculated food cost monthly and compare it with your actual purchases. Large differences point to data problems you need to fix.
✨ Pro tip
Take a photo of every invoice and check right away if the prices in your system are still correct. This prevents you from working with wrong numbers for weeks.
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
Why don't my calculations match reality?
This is almost always due to outdated prices or wrong portion sizes in your system. First check if your ingredient prices still match your latest invoices.
Can't the system automatically update prices?
No, every restaurant has different suppliers and prices. You need to manually update your prices when your supplier raises them.
How often should I check my data?
Check your ingredient prices monthly and a few random portion sizes weekly. This prevents your system from slowly becoming unreliable.
What if my chef gives different portions than in the system?
Then you need to choose: either adjust the system to match reality, or train your chef to give the correct portions. Both need to match.
Why is my food cost higher than the system shows?
Usually you're forgetting costs: garnish, sauces, oil, butter on the plate. Or your chef gives larger portions than you entered.
📚 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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