Your walk-in cooler holds $8,000 worth of ingredients, but you're not sure if that's too much or too little. Inventory turnover reveals how efficiently you're converting stock into sales. This metric shows if you're tying up cash in products that sit too long.
What is inventory turnover?
Inventory turnover measures how frequently you sell and replace your stock annually. It's the ratio between your yearly purchase costs and the average value of your inventory.
High turnover signals efficiency: you're quickly selling what you buy. Low turnover means cash gets trapped in products that linger way too long.
💡 Example:
Restaurant De Smaak has:
- Annual purchase costs: €120,000
- Average inventory value: €10,000
Inventory turnover: €120,000 / €10,000 = 12x per year
The formula for inventory turnover
The calculation is straightforward:
Inventory turnover = Annual purchase costs / Average inventory value
You can also express this in days:
Inventory in days = 365 / Inventory turnover
💡 Example calculation:
If your inventory turns over 12x per year:
365 days / 12 = 30 days average inventory
This means each product sits in your inventory for an average of 30 days before it's sold.
How do you calculate average inventory value?
You determine average inventory value by counting your stock monthly and calculating the mean:
- Count the total value of your inventory each month (or week)
- Add up all measurements
- Divide by the number of measurements
⚠️ Note:
Use purchase prices for your inventory value, not selling prices. You want to know how much money you have tied up in purchases.
Benchmarks by restaurant type
Optimal inventory turnover rates vary by establishment type:
- Fast food/delivery: 20-30x per year (12-18 days inventory)
- Casual dining: 15-20x per year (18-24 days inventory)
- Fine dining: 10-15x per year (24-36 days inventory)
- Hotel restaurant: 8-12x per year (30-45 days inventory)
Fine dining typically shows lower turnover due to premium ingredients and extensive menu variety. Based on real restaurant P&L data from over 200 establishments, restaurants exceeding these ranges often struggle with cash flow issues.
💡 Practical example:
Bistro Het Plein turned over 8x per year (45 days inventory). This was low for a bistro:
- Too many different products purchased
- Portions estimated too large
- Seasonal products bought too early
By focusing on core products, they increased to 14x per year.
What does a low inventory turnover mean?
Low turnover (below 8x per year) can indicate several issues:
- Excessive purchasing: You're buying more than you're selling
- Wrong products: Ingredients that aren't popular
- Poor planning: No alignment between purchasing and expected sales
- Waste: Products spoil before they're used
⚠️ Note:
Every €1,000 you have sitting in inventory too long costs you roughly €50-100 per year in interest and spoilage risk.
How do you improve your inventory turnover?
Concrete steps to boost your turnover:
- Analyze your bestsellers: Focus purchasing on your 10 best-selling dishes
- Smaller, more frequent deliveries: Choose 2x per week fresh over 1x per week in bulk
- Apply FIFO consistently: First In, First Out for all products
- Seasonal menu: Adjust your menu to available ingredients
- Daily inventory check: Know what you have before you order
Inventory turnover by product category
Different products turn over at varying speeds. Typical turnover rates:
- Fresh vegetables/fish: 30-50x per year (7-12 days)
- Meat: 20-30x per year (12-18 days)
- Dry goods: 8-15x per year (24-45 days)
- Wine/beverages: 4-8x per year (45-90 days)
By measuring each product category separately, you'll identify where your inventory is turning too slowly.
💡 Digital support:
With restaurant management software, you can track your purchase costs and inventory value automatically, so you can calculate your turnover without manual Excel work.
How do you calculate inventory turnover? (step by step)
Gather your annual purchase costs
Add up all purchase invoices from the past 12 months. Include only ingredient costs, not equipment or other expenses. This gives you your total annual purchase costs.
Calculate your average inventory value
Count the value of all your inventory monthly (at purchase prices). Add up these 12 measurements and divide by 12. This gives you your average inventory value.
Apply the formula
Divide your annual purchase costs by your average inventory value. The result is your inventory turnover per year. For days: divide 365 by this number.
✨ Pro tip
Check your protein turnover every 2 weeks during summer months - beef and seafood should hit 25-35x annually. If you're seeing 18x or lower, you're over-ordering expensive items that eat into margins.
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
What is a good inventory turnover for a restaurant?
For most restaurants, optimal turnover ranges between 12-20x per year. Fast food turns faster (20-30x), fine dining slower (10-15x). Below 8x per year typically indicates inefficiency.
Should I include all products in my inventory value?
Yes, include everything you sell: fresh products, frozen goods, dry goods, and beverages. Always use purchase prices, not selling prices. Don't include cleaning supplies and equipment.
How often should I count my inventory for this calculation?
At least once per month for a reliable average inventory value. Counting weekly gives an even more accurate picture, especially if your inventory fluctuates significantly.
What if my turnover is too low?
Focus on your best-selling dishes, order smaller quantities more frequently, and check daily what you already have before ordering. A turnover below 8x often means too much money tied up in inventory.
Does inventory turnover differ by season?
Yes, during busy periods (summer, holidays) inventory often turns faster. Measure throughout the year for a realistic average. Adjust your purchasing to seasonal patterns.
Can I calculate turnover for individual ingredients?
Absolutely, and you should for expensive items like prime cuts or specialty ingredients. Track your top 20 most expensive ingredients separately to identify which ones are sitting too long.
How does menu size affect inventory turnover?
Larger menus typically reduce turnover because you need more diverse ingredients in smaller quantities. Streamlining your menu to 15-20 core dishes can significantly improve turnover rates.
📚 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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