How much money are you actually losing when inventory approaches its expiration date? Most restaurant owners toss products without calculating the real cost or offer discounts without knowing if they're still profitable. The math behind value reduction helps you make smarter financial decisions.
Why calculating value reduction matters
Without knowing your inventory's declining value, you can't make informed decisions. Discarding food costs money, but excessive discounting hurts profits too.
? Example:
You've got 5 kg of salmon expiring tomorrow. Purchase price €18/kg.
- Total purchase value: 5 kg × €18 = €90
- If discarded: 100% loss = €90
- If 50% discount: €45 revenue remaining = €45 loss
Difference: €45 saved through quick action
The three scenarios for nearly expired inventory
You face three choices, each carrying different financial consequences:
- Discard completely: 100% loss of purchase value
- Sell discounted: Partial recovery
- Transform into new dishes: Preserve most value
Formula for value reduction
Calculate value reduction using this formula:
Value reduction = (Purchase value - Remaining value) / Purchase value × 100%
? Example calculation:
3 kg beef, purchase price €24/kg, sold at 40% discount:
- Purchase value: 3 kg × €24 = €72
- Regular selling price: €40/kg (food cost 30%)
- Discounted price: €40 × 0.60 = €24/kg
- Remaining value: 3 kg × €24 = €72
Value reduction: (€72 - €72) / €72 = 0%
⚠️ Note:
Always use the actual discounted selling price, not original menu pricing. And remember—you still have prep costs to cover.
Break-even point for discount sales
To prevent additional losses from discounted sales, you must recover your variable costs:
- Ingredient purchase price
- Labor time (chef wages)
- Utilities for preparation
- Packaging (takeaway orders)
? Break-even calculation:
Steak expiring tomorrow:
- Purchase price: €12/piece
- Prep costs: €3/piece
- Minimum selling price: €15/piece
Anything under €15 = additional loss beyond the original issue
Alternative processing options
Smart processing often limits value reduction significantly:
- Meat: Transform into stews, ragouts or ground preparations
- Fish: Create soups or battered dishes
- Vegetables: Soups, smoothies or accompaniments
- Dairy: Sauces, desserts or marinades
Processing typically retains 70-90% of original value, compared to 0% from disposal. From years of working in professional kitchens, I've seen this approach save thousands annually.
Prevention: avoid value reduction
The smartest strategy prevents inventory from approaching expiration:
- FIFO system: First In, First Out rotation
- Smaller orders: Purchase more frequently
- Daily monitoring: Track products with 2-3 days remaining
- Menu flexibility: Feature specials using aging inventory
⚠️ Note:
Never sell actually expired products. This applies to items approaching expiration but still safe for processing.
Impact on annual basis
Value reduction from near-expired inventory accumulates substantially:
? Annual impact example:
Restaurant with €8,000 monthly purchases:
- 5% of inventory approaches expiration
- Average 60% value reduction
- Monthly loss: €8,000 × 0.05 × 0.60 = €240
Annual loss: €240 × 12 = €2,880
Better planning and strategic processing can reduce this loss by 50-80%.
How do you calculate value reduction? (step by step)
Inventory the stock
Count all products that expire within 1-2 days. Note the quantity and the original purchase price per unit. Calculate the total purchase value.
Determine the residual value
Calculate what you can still get: if throwing away it's €0, if selling at discount the new selling price, if processing the value in the new dish. Deduct any additional preparation costs.
Calculate the loss percentage
Use the formula: (Purchase value - Residual value) / Purchase value × 100%. This gives you the exact loss percentage so you can make the best choice between the available options.
✨ Pro tip
Check every morning which products expire within 72 hours and immediately create daily specials featuring them. You'll sell at regular prices instead of steep discounts.
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
Can I still sell products that expire tomorrow?
How much discount can I offer at most?
Do I need to register value reduction for accounting?
How do I prevent inventory from nearly expiring?
Is it better to sell at discount or throw away?
What's the minimum shelf life I should accept from suppliers?
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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
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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