Most operators think they're controlling inventory well, yet they're bleeding 10-15% of every purchase through hidden losses. Shrinkage percentage tracks how much of your bought ingredients never reach paying customers. This single metric exposes the difference between what you think you're spending and what you're actually losing.
What exactly is shrinkage?
Shrinkage captures every ingredient dollar that disappears before generating revenue. It includes spoiled proteins rotting in walk-ins, vegetables wilting from poor storage, and prep waste from rushed kitchen work. You're measuring the gap between purchased inventory and what actually makes it to plates.
💡 Example:
You buy €2,000 worth of meat this week:
- Sold to guests: €1,700 (at purchase value)
- Thrown away (spoilage): €150
- Wasted during preparation: €100
- Leftover mise-en-place: €50
Shrinkage: €300 of €2,000 = 15%
The formula for shrinkage percentage
The calculation stays simple, but consistent tracking separates profitable kitchens from struggling ones:
Shrinkage % = ((Purchases - Sales at purchase value) / Purchases) × 100
Critical point: stick to purchase values throughout. Menu prices don't matter here - you're tracking raw ingredient losses.
Different types of shrinkage
Shrinkage hits your kitchen in predictable ways. Identifying the source helps you fix it:
- Spoilage shrinkage: Products that expire before use
- Preparation shrinkage: Loss during cooking and plating
- Cutting shrinkage: Waste from processing (bones, peels, trim)
- Portion shrinkage: Oversized servings or inconsistent portioning
⚠️ Note:
Cutting loss shouldn't count as shrinkage. That's expected waste you should build into your cost calculations. Real shrinkage is preventable loss that hurts your bottom line.
Common shrinkage percentages per product group
Different ingredients carry different risk profiles. Know what's normal:
- Fresh fish: 8-15% (extremely perishable)
- Meat: 5-12% (storage-dependent)
- Vegetables: 10-20% (varies by season and type)
- Dairy: 3-8% (better shelf stability)
- Dry goods: 1-5% (rice, pasta, etc.)
💡 Example calculation per product group:
Vegetables this month:
- Purchased: €800
- Used in sold dishes: €680
- Thrown away/wasted: €120
Shrinkage: (€120 / €800) × 100 = 15%
What you can do with these numbers
From years of working in professional kitchens, I've seen how shrinkage data reveals exactly where your money disappears:
- Above 15%: Red flag - investigate purchasing and storage immediately
- 10-15%: Acceptable range, but room for improvement exists
- Below 10%: Excellent control - maintain current practices
Focus on your highest-cost categories first. A 12% shrinkage on premium proteins damages margins far more than identical percentages on garnishes.
Including shrinkage in your cost price
Your real ingredient cost exceeds what you pay suppliers because of shrinkage:
Actual cost price = Purchase price / (1 - Shrinkage %)
💡 Example cost price correction:
Salmon fillet:
- Purchase price: €20.00/kg
- Shrinkage: 12%
Actual cost price: €20.00 / 0.88 = €22.73/kg
How do you calculate shrinkage percentage? (step by step)
Track your purchases
Record everything you buy with amounts. Distinguish by product group (meat, fish, vegetables, dairy). You can do this weekly or monthly.
Measure what you've used
At the end of the period, add up how much you actually used in sold dishes. Convert this back to purchase value, not selling prices.
Calculate the difference
Subtract the amount used from your purchases. This difference is your shrinkage. Divide by your total purchases and multiply by 100 for the percentage.
✨ Pro tip
Compare shrinkage rates between your top 3 suppliers over 60 days - you'll discover that paying 8% more for premium ingredients often cuts total costs through reduced waste.
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 normal shrinkage percentage for a restaurant?
Most restaurants see 8-12% shrinkage across all categories. Anything above 15% signals serious control issues that demand immediate attention.
Should I include cutting loss in my shrinkage calculation?
No, cutting loss is expected waste that's part of the product. True shrinkage represents preventable loss from poor planning, storage problems, or preparation mistakes.
How often should I calculate shrinkage?
Calculate monthly by product category to start. If you discover problem areas, switch to weekly tracking for those specific items until you see improvement.
How do I factor shrinkage into my selling price?
Adjust your ingredient cost upward by the shrinkage percentage before calculating food cost percentages. With 10% shrinkage, a €20 ingredient actually costs €22.22 to put on the plate.
📚 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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