Most restaurants stick with one supplier per ingredient for simplicity, but smart operators split their sourcing to balance cost and quality. This flexibility comes with a catch - your margin calculations become trickier. You'll need to determine the weighted cost based on how much you actually buy from each supplier.
Why multiple suppliers for one ingredient?
Several compelling reasons drive this strategy:
- Risk mitigation: Backup options prevent supply disruptions
- Quality tiers: Premium ingredients for specials, standard for everyday dishes
- Cost balancing: Mix affordable wholesale pricing with specialty supplier quality
- Seasonal shifts: Different suppliers excel at different times of year
Calculate the weighted average cost price
With multiple suppliers, you need a weighted average that reflects your actual purchasing patterns.
💡 Example: Beef from 2 suppliers
Your steak sourcing breakdown:
- 60% from local butcher: €28.00/kg
- 40% from wholesale distributor: €22.00/kg
Weighted average: (0.60 × €28.00) + (0.40 × €22.00) = €16.80 + €8.80 = €25.60/kg
Formula for weighted average cost price
Here's the calculation:
Weighted cost price = (Percentage supplier 1 × Price 1) + (Percentage supplier 2 × Price 2)
The percentages must total 100%.
⚠️ Watch out:
Monitor your ratios regularly. Price increases from one supplier might shift your optimal purchasing mix toward the other.
Calculate margin with weighted cost price
Once you've got the weighted cost price, margin calculation proceeds normally:
Food cost % = (Weighted cost price per portion / Selling price excl. VAT) × 100
💡 Example: Complete margin calculation
200g steak using weighted cost price €25.60/kg:
- Meat per portion: 0.2 kg × €25.60 = €5.12
- Additional ingredients: €2.40
- Total cost per dish: €7.52
- Menu price: €32.00 incl. VAT = €29.36 excl. VAT
Food cost: (€7.52 / €29.36) × 100 = 25.6%
Practical tips for supplier mix
- Track actual usage: Your planned ratios rarely match real purchasing patterns
- Monthly recalculation: Seasonal changes and availability affect supplier mix
- Minimum order requirements: Factor these into your purchasing decisions
- Quality consistency: Cheaper isn't better if customers notice the difference
Administration with multiple suppliers
Managing multiple suppliers demands detailed record-keeping. Track for each dish:
- Which suppliers provide each ingredient
- Your actual purchasing ratios
- Current pricing from all suppliers
- Last ratio review date
This is the kind of thing you only learn after closing your first month at a loss - accurate cost tracking becomes absolutely critical once you're mixing suppliers.
💡 Example: System documentation
Beef ingredient record:
- Supplier A (Local Butcher): €28.00/kg - 60%
- Supplier B (Metro Wholesale): €22.00/kg - 40%
- Current weighted price: €25.60/kg
- Last updated: March 15, 2024
Food cost management systems can automatically calculate and maintain these weighted prices, ensuring you always know your true ingredient costs.
How do you calculate the margin with multiple suppliers? (step by step)
Determine the ratio per supplier
Look at your purchases from the last month. What percentage do you buy from supplier A and how much from supplier B? For example: 70% from the wholesaler, 30% from the specialist supplier.
Calculate the weighted average price
Multiply each percentage by the corresponding price and add them up. Formula: (Percentage A × Price A) + (Percentage B × Price B) = Weighted cost price per kg.
Calculate cost price per portion
Multiply the weighted cost price per kg by the weight you use per portion. For example: €24.50/kg × 0.25 kg = €6.13 per portion for this ingredient.
Add up all ingredients and calculate food cost
Add the costs of all other ingredients for the total cost price per dish. Divide by your selling price (excl. VAT) and multiply by 100 for your food cost percentage.
✨ Pro tip
Create a monthly 'supplier audit' where you compare your planned 60/40 split against actual invoices from the past 4 weeks. Adjust your weighted costs based on real usage, not estimates.
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 update my supplier ratio?
Review this monthly at minimum. Your actual purchases often deviate from planned ratios due to seasonal availability, quality variations, or supply disruptions. Update your weighted cost price whenever the ratio shifts more than 10%.
What if one supplier suddenly raises prices significantly?
Recalculate your weighted cost price immediately and verify your food cost targets are still achievable. You might shift more volume to the cheaper supplier, but consider quality implications first.
Can I use different supplier mixes for different menu items?
Absolutely - this is often the smartest approach. Premium ingredients work for signature dishes while standard quality suits everyday items. Calculate separate weighted costs for each dish based on its specific supplier mix.
How do I avoid excess inventory when ordering from multiple suppliers?
Plan purchases based on your established ratios and coordinate delivery schedules. Track actual usage patterns from each supplier to prevent overstocking either option.
📚 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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