Every month, thousands of dollars sit locked away in your walk-in cooler, dry storage, and bar inventory. Most restaurant owners focus on food cost per plate but miss this silent profit killer. Your inventory percentage reveals exactly how much working capital you've tied up in unsold ingredients.
What exactly are inventory costs?
Inventory costs represent the cash value of every ingredient sitting in your cooler, freezer, dry storage, and bar area. Think of it as money that's temporarily frozen until those products move through your kitchen.
💡 Example:
Restaurant De Buurman currently has in stock:
- Meat and fish: €2,400
- Vegetables and fruit: €800
- Dry storage: €1,200
- Beverages: €1,600
Total inventory value: €6,000
The formula for inventory cost percentage
Calculate your inventory costs as a percentage of monthly revenue using this straightforward formula:
Inventory cost % = (Total inventory value / Monthly revenue) × 100
Always use revenue excluding VAT for accurate results.
💡 Example calculation:
Restaurant De Buurman:
- Inventory value: €6,000
- Monthly revenue excl. VAT: €45,000
- Calculation: (€6,000 / €45,000) × 100 = 13.3%
This restaurant has 13.3% of its revenue tied up in inventory.
What is a healthy inventory percentage?
Restaurant inventory values typically fall between 8% and 15% of monthly revenue. Your cuisine type determines where you'll land:
- Fast food/pizza: 6-10% (mostly shelf-stable items, minimal fresh products)
- Casual dining: 10-15% (balanced mix of fresh and preserved ingredients)
- Fine dining: 12-18% (premium fresh ingredients, higher value items)
- Fish restaurant: 8-12% (daily fresh deliveries, minimal storage)
⚠️ Watch out:
Anything above 20% signals trouble. You've got excessive capital tied up in inventory that might spoil or isn't turning over quickly enough.
Why high inventory costs are dangerous
Excessive inventory hits your bottom line in three critical ways:
- Cashflow: Capital sits idle instead of generating returns
- Spoilage: Products expire before you can use them
- Space: Overcrowded storage leads to lost inventory and poor organization
From my experience, this represents one of the most common blind spots in kitchen management - owners focus on daily sales but ignore the cash sitting in their walk-ins.
💡 Impact calculation:
If your inventory percentage drops from 20% to 12%:
- Monthly revenue: €50,000
- Difference: 8% of €50,000 = €4,000
- You can redirect this money toward marketing, equipment upgrades, or improved cashflow
How often should you count inventory?
Complete inventory counts should happen at least once monthly. Most restaurants schedule this for month-end, right before major deliveries arrive.
Pro move: photograph your inventory during counts. You can verify numbers later without recounting everything from scratch.
Digital vs. manual inventory tracking
Plenty of kitchens still rely on Excel spreadsheets or paper logs. But these methods eat up time and invite costly errors. Digital systems like tools such as KitchenNmbrs automatically track inventory values and display your percentage in real-time.
The payoff: you spot inventory creep immediately rather than discovering problems weeks later during your monthly count.
How do you calculate inventory cost percentage? (step by step)
Count your complete inventory value
Go through your entire kitchen: cooler, freezer, dry storage and bar. Write down everything you have and what it cost. Include partial packages too (estimate the percentage remaining).
Determine your monthly revenue excluding VAT
Take your revenue from last month and subtract the VAT. At 9% VAT: divide by 1.09. This gives you an accurate picture of your actual revenue.
Calculate the percentage
Divide your inventory value by your monthly revenue and multiply by 100. For example: €8,000 inventory / €60,000 revenue × 100 = 13.3% inventory costs.
✨ Pro tip
Audit your storage areas every 10 days to identify products that haven't moved in over 3 weeks. Feature these items in daily specials or limited-time offers before they hit expiration dates.
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 VAT in my inventory calculation?
Never include VAT in these calculations. Your inventory purchases don't contain VAT (you only collect VAT when selling), and you should calculate revenue excluding VAT for accurate comparison.
What if my inventory percentage exceeds 20%?
You've likely over-ordered or you're holding slow-moving products. Identify items that have been sitting too long and temporarily halt orders for those products until inventory levels normalize.
Do opened bottles and partial containers count?
Absolutely - anything with remaining value counts toward your total. Estimate the percentage remaining and calculate accordingly. A half-empty €20 wine bottle contributes €10 to your inventory value.
How does this differ from food cost percentage?
Food cost measures ingredient expenses per dish sold, while inventory cost tracks capital tied up in unsold ingredients. Food cost affects profit margins; inventory cost impacts cashflow and working capital.
📚 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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