Inventory value loss is the difference between what your inventory was worth at the beginning of the month versus the end. This gives insight into waste, spoilage and purchasing inefficiency. In this article you'll learn step-by-step how to calculate this and what the numbers mean for your profit.
What is inventory value loss?
Value loss occurs due to three main causes:
- Spoilage: Products that go past their expiration date
- Waste: Ingredients that are thrown away during preparation
- Shrinkage: Evaporation, drying out, weight loss
By measuring this monthly, you see where you're losing money without passing it on to your guests.
💡 Example:
Restaurant De Smaak has at the beginning of March:
- Meat in freezer: €2,400
- Vegetables in cooler: €800
- Dry goods: €600
Total opening value: €3,800
The basic formula
The formula for inventory value loss is:
Value Loss = Opening Inventory + Purchases - Closing Inventory - Sales (at cost price)
This seems complicated, but it becomes clearer when you work through it step by step.
⚠️ Note:
Always calculate using cost prices, not selling prices. It's about what the ingredients cost you, not what you charge your guests.
Alternative method: direct counting
A simpler way is to directly measure what gets thrown away:
- Track daily what goes in the trash
- Estimate the value of discarded food
- Add it up over the entire month
This method is less accurate, but gives you a realistic picture of your waste.
💡 Practical example:
Bistro Het Plein throws away daily:
- Expired vegetables: €8 per day
- Failed dishes: €5 per day
- Over-prepared items: €12 per day
Per month: €25 × 30 days = €750 waste
What are normal percentages?
Common inventory value loss in hospitality is between 3% and 8% of your total purchases per month. Above 10% indicates structural problems.
- 3-5%: Well-controlled kitchen
- 5-8%: Average for most restaurants
- 8-12%: High, action needed
- 12%+: Serious problem, money is leaking away
How do you use this information?
Once you know how much value you're losing monthly, you can take targeted action:
- FIFO system: First In, First Out for inventory
- Smaller orders: Order more frequently, store less long
- Better planning: Mise-en-place based on reservations
- Pass it on: Include waste costs in your pricing
💡 Annual impact:
€750 waste per month = €9,000 per year. At 30% margin, this means you need €30,000 extra revenue to compensate.
Digital tools
Manually tracking inventory values takes a lot of time. An app like KitchenNmbrs helps by:
- Automatically calculating your inventory value
- Centralizing cost prices
- Recording daily waste
- Generating monthly reports
This gives you more time to take action instead of crunching numbers.
How do you calculate inventory value loss step by step?
Count your opening inventory
Go through your entire kitchen and count all inventory at cost price. Do this at a fixed time, for example the first of each month at 9:00 AM. Note everything: meat, fish, vegetables, dry goods, beverages.
Track all purchases
Record every delivery with date and amount. Keep all invoices and total your purchase amount at the end of the month. Note: only count ingredients, not equipment or cleaning supplies.
Count your closing inventory
On the last day of the month, count all inventory again at cost price. Use the same method as step 1 for a fair comparison. The difference between opening and closing inventory shows your inventory change.
✨ Pro tip
Measure your inventory value loss for three months and take the average. This gives you a realistic picture and helps you build a fixed waste percentage into your pricing.
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
Do I need to count all inventory every month?
For accurate measurement, yes. You can start with just expensive items (meat, fish) and expand later. Many restaurants do this on a fixed day each month.
How do I estimate the value of discarded food?
Use the cost price per kilo and estimate the weight. A discarded piece of salmon weighing 200 grams at €30/kg costs you €6. It doesn't need to be exact to the cent.
What is an acceptable waste percentage?
Between 3% and 8% of your total monthly purchases is normal. Above 10% means something is structurally wrong with planning, storage or portion control.
How do I prevent high inventory value loss?
Order smaller quantities more frequently, work with the FIFO principle, plan your mise-en-place better and check expiration dates daily. Small adjustments can make a big difference.
Can I pass waste costs on to my prices?
Yes, factor 3-5% waste into your cost price. If ingredients cost €8, calculate with €8.40 to cover normal waste.
📚 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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