Your steak is bleeding money and you don't even know it. You calculated that dish cost months ago, scribbled it somewhere, then moved on. Now your "profitable" ribeye is actually costing you €2 per plate.
Why calculations disappear into thin air
The math isn't the problem. You can crunch those numbers. But what happens next? Absolutely nothing.
- You scrawl the cost on paper that vanishes
- You bury it in Excel that nobody touches
- You store it in your brain and it evaporates
- You hand it to your chef, who shrugs and forgets
💡 Example:
You break down your ribeye steak costs:
- Meat: €8.50
- Garnish: €1.20
- Sauce: €0.80
- Oil, butter: €0.50
Total: €11.00 = 34% food cost at €32 menu price
You jot this down, but 3 months later your supplier bumps meat prices 15%. Your menu stays €32, food cost jumps to 39%. Nobody catches this drift.
What forgotten calculations actually cost you
Every abandoned calculation drains your profits. Not because you did the math wrong, but because everything shifts while you're not watching.
- Suppliers jack up prices - happens 2-3 times yearly
- Seasons flip - vegetables swing 30-50% in cost
- Portions grow - your chef adds a little extra each service
- Recipes evolve - "let's throw in some truffle oil"
⚠️ Heads up:
Any cost calculation over 6 months old is probably worthless. Suppliers shift prices, seasons change, portions creep. Review your top sellers every 90 days minimum.
Calculating once vs. watching constantly
You calculate once and think you're done. But monitoring? That's ongoing work. Most kitchens crash right here.
💡 Example:
Restaurant The Golden Spoon calculates 12 main course costs in January:
- Average food cost: 31%
- Everything looks solid
July reality check reveals:
- Average food cost: 37%
- Gap: 6 points on €400,000 revenue = €24,000 vanished
Culprit: Zero updates when prices climbed.
Red flags your numbers are stale
Don't wait for monthly reports to spot trouble. These warning signs scream that your cost calculations are ancient history:
- Revenue climbs but profit flatlines - more covers, same margins
- You feel pricier than competitors - though your menu prices match
- Guests grumble about shrinking portions - your chef's cutting costs desperately
- You're ordering inventory more frequently - portions have expanded
Why systems beat sticky notes
You can calculate costs just fine. What you lack is a system to track and update them.
From analyzing actual purchasing data across different restaurant types, effective systems handle three core functions:
- Preserves your calculations - no more hunting for scraps of paper
- Simplifies updates - new supplier price gets one-click adjustment
- Reveals the big picture - which dishes are hemorrhaging money?
💡 Example:
Tools like KitchenNmbrs instantly show you:
- Which dishes exceed 35% food cost
- Impact when you tweak ingredient prices
- Minimum menu price needed for target margins
No spreadsheets, no papers, no "where'd I put that calculation" moments.
The price of procrastination
Each month you delay building a system, money trickles away. Not in dramatic floods, but steady leaks.
- 2% excess food cost = €667 monthly loss at €40,000 revenue
- 5% excess food cost = €1,667 monthly loss at €40,000 revenue
- Annual damage: €8,000 to €20,000 you could pocket instead
Building a system takes one afternoon. It delivers months of clarity and control.
How do you make sure calculations don't get forgotten? (step by step)
Collect all cost prices in one place
Stop with papers and loose Excel files. Put all recipes and cost prices in one system everyone can access. That could be an app like KitchenNmbrs, or a well-organized Excel you open weekly.
Schedule monthly checks of your top sellers
Put it in your calendar: every first Monday of the month check the food cost of your 5 best-selling dishes. Update ingredient prices if they've changed. This takes 30 minutes per month.
Set alerts for critical thresholds
Determine your maximum food cost per dish (for example 35%) and check which dishes exceed it. Adjust the menu price immediately or find cheaper alternatives for expensive ingredients.
✨ Pro tip
Calculate one extra dish every Tuesday morning. Not because you must, but because you'll catch cost creep before it murders your margins. Small tweaks prevent big disasters.
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 check my cost prices?
Your bestsellers need monthly reviews. Everything else gets quarterly checks. Suppliers shift prices, seasons change, portions drift upward. Any cost calculation over 6 months old is probably fantasy.
What if I don't have time for monthly reviews?
Focus on your top 3 dishes first. They drive 60-70% of revenue, so fixing them solves your biggest leak. Fifteen minutes monthly for 3 dishes won't kill your schedule.
Can't I just eyeball whether a dish makes money?
Rough estimates work for ballpark figures, not precision. A 3-point food cost difference looks tiny but costs €12,000 yearly on €400,000 revenue. You need real numbers, not gut feelings.
What if my supplier suddenly jacks up prices?
Update your cost calculations immediately and check food cost percentages. Above 35%? You've got three moves: raise menu prices, find cheaper ingredients, or shrink portions. Without a system, you won't notice for months.
📚 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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