Most restaurant owners think tracking margins across multiple suppliers is too complex, so they guess—and lose money without realizing it. Multiple suppliers do make calculations trickier, but the process is straightforward once you know the steps. Here's how to calculate exact margins even with ingredients from five different suppliers.
Why multiple suppliers complicates your margin calculation
With one supplier, everything appears on a single invoice. But five suppliers means five different pricing structures, delivery schedules, and discount tiers. Without proper tracking, costs slip through the cracks.
⚠️ Watch out:
Most operators focus only on major ingredient costs and overlook smaller ones. That teaspoon of truffle paste at €2 per 100 grams? It's costing you €0.40 per portion—and those additions accumulate fast.
Collect all ingredient prices per supplier
Build a comprehensive overview of each ingredient with actual purchase prices. Remember: invoice prices don't always reflect your true cost.
- Supplier A: Main ingredient plus any volume discounts
- Supplier B: Vegetables with seasonal price swings
- Supplier C: Spices with minimum order requirements
- Supplier D: Dairy products with shelf life considerations
- Supplier E: Meat/fish with fresh versus frozen pricing
💡 Example: Pasta carbonara
Ingredients sourced from 5 different suppliers:
- Pasta (Supplier A): €0.85 per portion
- Bacon (Supplier B): €1.20 per portion
- Eggs (Supplier C): €0.45 per portion
- Parmesan (Supplier D): €0.95 per portion
- Truffle paste (Supplier E): €0.40 per portion
Total ingredient costs: €3.85 per portion
Account for trim loss and waste
Different suppliers often mean varying product qualities. Fresh ingredients typically generate more waste than frozen alternatives. You must factor this into your actual cost calculations—and this represents one of the most common blind spots in kitchen management.
- Fresh vegetables: 15-25% trim loss
- Fresh fish: 40-55% trim loss
- Fresh herbs: 10-20% waste
- Frozen products: Minimal loss
Formula for actual cost price:
Actual price = Purchase price ÷ (100% - Loss%)
💡 Example: Fresh basil
You purchase fresh basil at €8 per kilo from Supplier C. Wilting causes 20% loss.
Actual price: €8 ÷ 0.80 = €10 per kilo of usable basil
Hidden cost: €2 per kilo more than anticipated!
Calculate your food cost percentage
With all actual ingredient costs documented, you can determine your food cost. Critical reminder: always calculate using your selling price excluding VAT.
Food cost formula:
Food cost % = (Total ingredient costs ÷ Selling price excl. VAT) × 100
💡 Example: Pasta carbonara margin
Total ingredient costs: €3.85
Menu price: €18.50 including 9% VAT
Selling price excluding VAT: €18.50 ÷ 1.09 = €16.97
Food cost: (€3.85 ÷ €16.97) × 100 = 22.7%
Margin: €16.97 - €3.85 = €13.12 per plate
Keep track of supplier differences
Price changes don't happen simultaneously across suppliers. Supplier A might increase prices in January while Supplier B waits until March. Without systematic tracking, you're always reacting after profits have already eroded.
- Update prices per supplier immediately upon invoice receipt
- Recalculate food costs after every price adjustment
- Modify menu prices if food costs exceed 35%
⚠️ Watch out:
Most operators only track expensive ingredient changes. But if five small ingredients each increase by 10 cents, that's €0.50 per plate. At 100 plates weekly, you're losing €2,600 annually.
Use one system for all suppliers
Excel becomes chaotic with five suppliers—different tabs, inconsistent formulas, and missed updates create costly errors. A centralized database eliminates these problems.
Food cost management tools like KitchenNmbrs let you record all suppliers and prices in one location. Update one ingredient price and instantly see the impact across your entire menu.
How do you calculate the margin with multiple suppliers?
Create an overview of all ingredients per supplier
List each ingredient with the actual purchase price per unit. Calculate any discounts or surcharges directly into the price per kilo or per piece.
Calculate the actual cost price including loss
Add trim loss and waste to your purchase price. Fresh products often have 15-25% loss, frozen products much less. Divide your purchase price by the yield percentage.
Add up all ingredient costs and calculate your food cost
Sum all actual ingredient costs per portion. Divide this by your selling price excluding VAT and multiply by 100 for the food cost percentage.
✨ Pro tip
Track ingredient price changes within 24 hours of receiving each invoice from all five suppliers. Waiting until month-end means you've been unknowingly operating at reduced margins 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
Should I include delivery costs in my ingredient price?
Only if delivery costs are ingredient-specific. General delivery expenses typically fall under overhead rather than individual dish food costs.
What if one supplier costs more but delivers better quality?
Calculate whether superior quality reduces waste or justifies higher menu prices. Sometimes expensive suppliers prove cheaper due to reduced spoilage and trim loss.
How often should I update prices with multiple suppliers?
Review prices monthly at minimum for stable ingredients. For fresh products with seasonal fluctuations, check your major ingredients weekly to avoid margin erosion.
What if I have minimum orders with some suppliers?
Factor in the true cost per unit including potential waste from minimum orders. Sometimes a pricier supplier without minimums costs less overall than dealing with excess inventory.
📚 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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