Digital systems are only as reliable as the data you enter. Many hospitality entrepreneurs input prices and quantities based on gut feeling, which means their cost price calculations don't match reality. This article shows you how to systematically verify that your digital data matches what's actually happening in your kitchen.
Why data often doesn't match
The problem isn't with the systems, but with the input. Many entrepreneurs make these mistakes:
- Purchase prices from months ago still in the system
- Portion sizes estimated instead of weighed
- Cutting waste not factored into cost price
- Recipes adjusted in the kitchen but not in the system
⚠️ Watch out:
If your system says a dish has 28% food cost, but in reality it's 35%, you're losing money on every portion you sell.
Check your purchase prices weekly
Suppliers regularly raise their prices. Check your 10 most important ingredients every week:
- Compare the price in your system with your latest invoice
- Update immediately if there's a difference
- Pay special attention to meat, fish and dairy - those fluctuate the most
💡 Example:
You have beef in your system at €18/kg. On your latest invoice you see €21/kg.
- Difference: €3/kg
- For a 200g portion: €0.60 more per plate
- 50 portions/week: €30 per week loss
Per year: €1,560 loss on just one ingredient!
Weigh your portions to check reality
Most chefs serve larger portions than the recipe specifies. Do a spot check:
- Weigh 5 portions of your most popular dish
- Compare with what's in your system
- Calculate what the difference costs
💡 Example check:
Steak in system: 200g. Measured in kitchen: 230g.
- Difference: 30g extra meat
- Meat price: €24/kg = €0.024/gram
- Extra cost: 30g × €0.024 = €0.72 per portion
At 40 portions/week: €1,497 per year extra!
Test your cutting waste percentages
Cutting waste depends on your supplier's quality and your chef's skills. Check this monthly:
- Weigh a product before processing (for example, whole fish)
- Weigh the usable part after processing (fillets)
- Calculate the actual cutting waste percentage
- Compare with what's in your system
💡 Example cutting waste check:
Whole salmon test:
- Whole fish: 2.5 kg
- Fillets after processing: 1.3 kg
- Actual cutting waste: ((2.5 - 1.3) / 2.5) × 100 = 48%
- In system: 40%
Your fillet is 15% more expensive than you thought!
Check recipe changes with your chef
Chefs adjust recipes without telling you. Have a brief conversation weekly:
- Which dishes were made differently this week?
- Were any ingredients added or removed?
- Were portion sizes adjusted?
- Update your system immediately
⚠️ Watch out:
A chef who adds "a little extra cream" to a sauce can increase your food cost by 3-5 percentage points without you noticing.
Compare total purchases with sales
A simple but powerful check: compare your total purchases with your sales over a week:
- Add up all invoices from the week
- Calculate what you should have purchased according to your system
- Big difference? Something's not right
Use temperature logging as a control
HACCP temperature logging also helps with data verification:
- Record cooling temperatures daily
- Check that deliveries arrive at the correct temperature
- Log reheating temperatures of prepared dishes
- Keep all records digitally for easy lookup
💡 Digital benefits:
With an app like KitchenNmbrs you can:
- Enter temperatures directly on your phone
- Update recipes while you're in the kitchen
- Apply price changes immediately
- Look up all data during inspections
Make verification part of your routine
Build these checks into your weekly routine:
- Monday: Check purchase prices from last week
- Wednesday: Weigh sample of 2-3 popular dishes
- Friday: Discuss recipe changes with chef
- Sunday: Compare total purchases with sales
This routine takes 30 minutes a week, but can save you hundreds of euros per month.
How do you verify your system data? (step by step)
Gather your latest invoices and system data
Get the invoices from your 3 main suppliers from last week. Open your cost price system and look up the same ingredients. Lay both side by side to compare.
Compare prices and update differences immediately
Check each ingredient: does the price in your system match the invoice? Update all differences immediately. Pay extra attention to meat, fish and dairy - those change most often.
Weigh a sample of your most popular dishes
Choose your 3 best-selling dishes and weigh 5 portions of each. Compare with your recipes in the system. Calculate what any differences cost per portion.
Test cutting waste for at least one product
Weigh a whole product before processing and the usable part after. Calculate the actual cutting waste percentage and compare with your system. Update if needed.
Discuss recipe changes with your chef
Ask your chef which dishes were made differently this week. Were any ingredients added, removed or portions adjusted? Update all changes in your system.
✨ Pro tip
Take photos of your actual portions next to a scale. This visual check helps your chef stay consistent and gives you proof for cost price discussions.
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
How often should I verify my system data?
Check purchase prices weekly, portion sizes monthly and recipes whenever they change. A fixed routine prevents small errors from having big consequences.
What if my chef makes portions differently than the recipe specifies?
Update your recipe in the system to match the actual portion size. Or agree that the chef sticks to the recipe. Consistency matters more than perfection.
Do I need to check every invoice or can I do spot checks?
Spot checks are enough. Focus on your 10-15 most important ingredients that make up 80% of your purchases. Those have the biggest impact on your cost price.
How do I know if my cutting waste percentage is correct?
Test one product monthly by weighing it before and after processing. Cutting waste varies depending on supplier quality and chef skills, so it can fluctuate.
What if I find big differences between system and reality?
First update your system with the correct data. Then calculate what the error cost you. Use that as motivation to keep better track going forward.
Can I automate these checks?
You need to do price checks and recipe updates manually. But you can record temperature logging and portion weighing digitally for easier lookup later.
⚠️ EU Regulation 1169/2011 — Allergen Information — https://eur-lex.europa.eu/eli/reg/2011/1169/oj
The allergen information on this page is based on EU Regulation 1169/2011. Recipes and ingredients may vary by supplier. Always verify current allergen information with your supplier and communicate this correctly to your guests. KitchenNmbrs is not liable for allergic reactions.
In the UK, the FSA enforces allergen regulations under the Food Information Regulations 2014.
📚 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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