Connecting purchasing data to sales reveals the true health of your restaurant's bottom line. Most owners buy ingredients based on instinct, never realizing their revenue barely covers food costs. This disconnect explains why busy restaurants often struggle with thin profit margins.
Why link purchasing and sales?
Your dining room stays packed, but monthly profits disappoint. The culprit usually hides in the gap between what you purchase and what you sell. Without connecting these numbers, you can't see:
- Which dishes actually make money
- Where profits leak away
- Real earnings per plate served
- Whether ingredient price increases demand menu adjustments
The basic formula
Your food cost percentage bridges purchasing and sales data:
💡 Formula:
Food cost % = (Cost of ingredients / Selling price excl. VAT) × 100
This calculation shows what portion of each sale goes toward ingredients. Everything else covers labor, overhead, and profit.
⚠️ Note:
Always use selling prices WITHOUT VAT. Menu prices include 9% tax, so divide by 1.09 to get the base price.
Concrete calculation per dish
💡 Example: Steak with fries
Menu price: €28.50 incl. VAT
Ingredient costs:
- Steak 200g: €6.40
- Fries 250g: €0.80
- Sauce: €0.60
- Vegetables: €1.20
Total purchasing: €9.00
Selling price excl. VAT: €28.50 / 1.09 = €26.15
Food cost: (€9.00 / €26.15) × 100 = 34.4%
This dish runs a 34.4% food cost. That's pushing the limit—most successful restaurants stay under 33%.
Total purchasing vs. total sales
Individual dish analysis matters, but your overall purchasing-to-sales ratio reveals the bigger picture. From years of working in professional kitchens, I've seen restaurants with profitable individual dishes still struggle because their purchasing patterns don't align with actual sales mix.
💡 Example: Monthly figures
Sales March: €45,000 incl. VAT
Sales March excl. VAT: €45,000 / 1.09 = €41,284
Total ingredient purchasing: €14,200
Total food cost: (€14,200 / €41,284) × 100 = 34.4%
A 34.4% total food cost means every euro of sales dedicates 34 cents to ingredients. The remaining 66 cents handles everything else—wages, rent, utilities, profit.
What are good figures?
Target food cost percentages vary by restaurant type:
- Bistro/brasserie: 25-32%
- Restaurant: 28-35%
- Pizzeria: 20-28%
- Café with kitchen: 25-35%
⚠️ Note:
These ranges serve as guidelines, not rigid rules. Your location, concept, and clientele create unique circumstances that might justify different targets.
Warning signs that the link isn't working
Red flags signal disconnected purchasing and sales:
- Food cost exceeding 35%: You're likely bleeding money
- Food cost under 20%: Prices might be scaring customers away
- Wild monthly swings: Portion control or buying discipline has collapsed
- Rising sales, shrinking profits: Food costs are spiraling upward
How often to check?
Maintaining healthy purchasing-sales connections requires regular monitoring:
- Daily: Compare actual sales against projections
- Weekly: Calculate food costs for top-selling items
- Monthly: Review overall food cost percentage
- Quarterly: Adjust menu prices for supplier increases
💡 Practical tip:
Focus on your five biggest sellers first. Getting those dishes profitable solves most of your food cost challenges.
Food cost management systems automate these connections, eliminating manual spreadsheet calculations entirely.
How do you link purchasing to sales? (step by step)
Collect all purchasing costs per dish
Add up all ingredients that go into one portion: main ingredient, garnish, sauce, oil, butter. Don't forget anything that goes on the plate.
Calculate the selling price excluding VAT
Divide your menu price by 1.09 (for 9% VAT). For example: €28.50 / 1.09 = €26.15 excl. VAT.
Calculate the food cost percentage
Divide the purchasing costs by the selling price excl. VAT and multiply by 100. For example: (€9.00 / €26.15) × 100 = 34.4%.
Compare with the benchmark
Check whether your food cost falls within the normal range (25-35% for most restaurants). Above 35% is often too high.
Repeat for your total monthly sales
Divide your total purchasing by your total sales excl. VAT. This gives you the overall food cost percentage for your entire business.
✨ Pro tip
Run food cost calculations on your 8 highest-volume dishes every two weeks. Most restaurants see 70% of their sales come from these core items, so keeping them profitable within a 14-day window prevents major losses.
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 include VAT in my food cost calculation?
Never include VAT in food cost calculations. You're just collecting that tax for the government, so it doesn't affect your actual profitability. Always use the base selling price excluding VAT.
What if my food cost comes out above 35%?
Time for immediate action. Either raise your menu prices, reduce portion sizes, or source cheaper ingredients. Some combination usually works better than relying on just one fix.
What if my total food cost differs greatly from individual dishes?
This suggests your sales mix doesn't match your calculations. You might be selling more high-cost dishes than expected, or waste is eating into profits. Track which items actually move and audit your inventory management.
📚 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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