That nagging feeling about your margins isn't just paranoia - it's usually your business sense picking up on real problems. Most restaurant owners know something's off with their food costs but can't put their finger on exactly what. Converting those gut instincts into hard data is what separates profitable kitchens from struggling ones.
Why gut feeling isn't enough
Something feels off. The restaurant's busy, customers seem happy, but profits remain elusive. Your chef insists portions are "standard," but what does that actually mean? That new supplier claims lower prices, but are they really saving you money?
Intuition gets you started, but data gives you certainty. More importantly: concrete numbers reveal exactly where you can make profitable changes.
💡 Example:
You serve 100 pasta dishes weekly at €16.50 each. Your instinct says: 'This has to be profitable.' But the numbers tell a different story:
- Ingredients: €5.80 per portion
- Selling price excl. VAT: €15.14
- Food cost: 38.3%
You're bleeding €200 weekly on this single dish.
The 3 most important numbers to start with
Don't overwhelm yourself tracking everything at once. Start with these three critical metrics:
- Food cost per dish: Ingredient costs versus revenue generated
- Daily revenue breakdown: Total sales plus individual dish performance
- Weekly waste totals: What gets tossed and why it's happening
These three numbers give you 80% of what you need to make smarter decisions.
⚠️ Note:
Always calculate using VAT-exclusive prices. That €16.50 menu price becomes €15.14 after dividing by 1.09. Otherwise, your food costs look artificially low.
From estimating to measuring
The gap between guessing and knowing comes down to measurement. But your measurements don't need perfection to deliver value.
What requires precise measurement:
- Expensive ingredients like meat, seafood, and premium cheeses
- Real portion sizes (weigh five identical dishes for accuracy)
- Actual purchase prices per kilogram or liter
What you can reasonably estimate:
- Inexpensive seasonings and basic spices
- Garnishes costing under €0.50 per portion
- Cooking oils and butter (unless you're running a fryer-heavy operation)
💡 Example measurement:
You believe you're serving 200-gram steaks. After weighing five actual plates:
- Plate 1: 220 grams
- Plate 2: 240 grams
- Plate 3: 210 grams
- Plate 4: 235 grams
- Plate 5: 225 grams
Average: 226 grams. You're over-portioning by 26 grams = €3.12 extra cost per serving.
From Excel to systems that actually work
Spreadsheets beat nothing, but they come with serious limitations:
- Manual calculations invite errors
- Formula mistakes can compound over time
- Single-computer access creates bottlenecks
- Team members can't collaborate effectively
From years of working in professional kitchens, I've seen how specialized tools eliminate these headaches by automatically calculating dish costs. You input ingredients, the system handles the math.
The real advantage: instant impact visualization. Reduce portions by 25 grams? You'll immediately see monthly savings projections.
The first week: from feeling to facts
Week one determines everything. You'll transition from "I suspect that..." to "I know exactly that...". Pick your three highest-volume dishes. Nothing else matters right now.
Track everything for seven straight days. Document it all. Crunch the numbers. By week's end, you'll have concrete data replacing those nagging suspicions.
💡 Week 1 result:
Restaurant De Buurman analyzed their three bestsellers:
- Steak: food cost 42% (dangerously high!)
- Salmon: food cost 29% (excellent)
- Pasta: food cost 31% (acceptable range)
Solution: reduced steak portions by 25 grams → food cost dropped to 35% → gained €180 weekly.
From gut feeling to numbers in 5 steps
Choose your 3 best-selling dishes
Start small. Pick your 3 most popular dishes and focus only on those. These are often your biggest profit makers too, so that's where the most impact is.
Measure exact portion sizes for one week
Weigh 5 plates of each dish every day. Write it down. After a week you know exactly how much you're really serving (often more than you think).
Collect all purchase prices
Go through your invoices and note the price per kilo or liter of all ingredients. Convert to price per portion. This is the foundation of your cost calculation.
Calculate the food cost per dish
Add up all ingredient costs and divide by your selling price excluding VAT. Multiply by 100 for the percentage. Above 35% is usually too high.
Make one concrete change
Choose the dish with the highest food cost and adjust something: smaller portion, different garnish, or higher price. Measure the effect the next week.
✨ Pro tip
Track your most suspicious dish for exactly 72 hours - that nagging feeling usually points toward your biggest profit leak. Most restaurants discover 15-20% cost savings within their first measurement week.
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 numbers?
Start with weekly tracking for your most important dishes. Once you've established a routine, monthly reviews work fine. But always recalculate immediately after supplier price changes.
What if I don't have time to keep track of everything?
Focus on your 3 best-selling dishes initially. That delivers 70% of the insights you need. Progress beats perfection every time.
Can't I just estimate what something costs?
Estimates beat nothing, but they're typically 20-30% off actual costs. On a €25 steak, that's €5-7.50 variance. Those errors compound significantly over a full year.
Do I really have to weigh everything down to the gram?
No. Prioritize expensive ingredients like meat, seafood, and premium cheeses. You can estimate spices and inexpensive garnishes under €0.50 per portion.
What if my food cost exceeds 35%?
You're likely losing money on that dish. Your options: reduce portion sizes, source cheaper ingredients, or raise menu prices. Start with whichever adjustment feels most manageable.
Should I track food costs differently for seasonal menu items?
Yes, seasonal ingredients fluctuate dramatically in price and availability. Calculate costs monthly for seasonal dishes, and build buffer margins of 3-5% to account for price volatility.
📚 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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