Think of your supplier relationship like choosing between a warehouse club and a corner store. The warehouse offers bulk pricing but requires massive upfront spending, while the corner store costs more per item but lets you buy exactly what you need. Most restaurant owners focus solely on the per-unit price, missing the complete financial picture.
The hidden costs of delivery frequency
Purchase price per kilo tells only part of the story. Your delivery schedule affects multiple cost centers:
- Purchase price per unit: Smaller quantities = often higher price per kilo
- Inventory costs: Less inventory = less capital tied up
- Waste: Less inventory = less spoilage
- Administrative costs: More deliveries = more invoices and checks
💡 Example:
Buying fish - two scenarios:
- Large: 20kg salmon for €16/kg, 1x per week
- Small: 6kg salmon for €18/kg, 3x per week
Price difference: €2/kg more with small deliveries
Calculate the total cost impact
A fair comparison requires including all expenses. Use this total cost formula:
Total cost = Purchase price + Inventory costs + Waste costs + Administrative costs
Step 1: Calculate inventory costs
Inventory costs represent money 'frozen' in unsold products. Calculate using your average inventory value × interest rate.
💡 Example inventory costs:
- Large: Average €320 salmon in inventory × 6% interest = €19.20/year
- Small: Average €108 salmon in inventory × 6% interest = €6.48/year
Savings with small deliveries: €12.72/year
Step 2: Calculate waste costs
Larger inventory volumes typically generate more spoilage waste. Fish and meat suffer particularly from this issue. Most kitchen managers discover too late that their 'savings' from bulk buying disappear through increased waste - especially during slower periods or unexpected menu changes. Calculate using your average waste percentage.
💡 Example waste:
With 1000kg salmon per year:
- Large: 8% waste = 80kg × €16 = €1,280
- Small: 4% waste = 40kg × €18 = €720
Savings with small deliveries: €560/year
⚠️ Note:
Waste percentages fluctuate by product and season. Track actual disposal amounts to use realistic percentages.
Step 3: Calculate administrative costs
More deliveries create more invoices to verify, more time spent purchasing. Calculate using your hourly rate × additional time per delivery.
The total calculation
Now combine everything for an accurate comparison:
💡 Total example (1000kg salmon/year):
Large deliveries:
- Purchase costs: 1000kg × €16 = €16,000
- Inventory costs: €19.20
- Waste: €1,280
- Administration: 52 deliveries × €5 = €260
Total: €17,559 = €17.56/kg
Small deliveries:
- Purchase costs: 1000kg × €18 = €18,000
- Inventory costs: €6.48
- Waste: €720
- Administration: 156 deliveries × €5 = €780
Total: €19,506 = €19.51/kg
In this example, large deliveries cost €1.95/kg less despite the higher purchase price of small deliveries.
Situations where small deliveries win
Small deliveries become more cost-effective with:
- High spoilage risk: Fresh fish, summer vegetables
- Limited cold storage: Inventory costs increase due to external storage
- Fluctuating demand: Seasonal products where forecasting proves difficult
- High capital costs: If your credit exceeds 10% interest
Practical tips for making the choice
Test both approaches for your 5 most expensive ingredients. That's where you'll see the biggest impact. Track actual waste levels for a month per delivery method.
A food cost calculator helps you monitor real purchase costs and waste, so you can work with actual numbers instead of guesswork.
How do you calculate the cost impact? (step by step)
Gather your current figures
Note your current purchase price, delivery frequency, and average inventory value. Also track how much you typically waste per week of this product.
Calculate inventory and waste costs
Calculate: (average inventory × interest rate) + (waste percentage × purchase value). These are your 'hidden' costs on top of the purchase price.
Compare the total cost per kilo
Add purchase price + inventory costs + waste costs + administrative costs. Divide by the number of kilos for the actual cost per kilo.
✨ Pro tip
Run parallel tests for 4 weeks comparing both delivery methods on your top 3 protein purchases. Track every gram of waste and measure actual storage costs - real data beats estimates every time.
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 do I calculate my inventory costs if I don't pay interest?
Even without loans, you have inventory costs. Use 4-6% as the interest rate - that's what your money could earn in savings accounts or investments.
Should I include administrative costs if I do the purchasing myself?
Yes, your time has value too. Calculate using €25-35 per hour for time spent on extra orders, checking, and processing invoices.
How do I know my actual waste percentage?
Track what you discard for 2-3 weeks and document reasons. Weigh it and calculate back to percentages of your purchases. This fluctuates by season and product.
What if my supplier gives volume discounts for larger orders?
Include the discount in your purchase price calculation. Sometimes a 10% discount more than offsets the extra inventory and waste costs.
📚 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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