A single dropped bottle of Barolo can cost you €45, but that's nothing compared to the silent drain of over-pouring 25ml extra per glass. Most restaurant owners discover their wine loss only during monthly inventory counts, watching 3-8% of beverage revenue vanish into thin air. Here's how to calculate exactly what wine loss costs your operation and stop the bleeding.
What counts as wine loss?
Wine loss happens at different moments and has different causes:
- Oxidation: Opened bottles that are stored too long
- Breakage: Dropped bottles, transport or storage damage
- Over-pouring: Too generous glasses (175ml instead of 150ml)
- Tastings: Wine for guests to sample
- Staff: Glass for the kitchen or service
Calculate your wine loss percentage
The wine loss percentage shows how much of your purchased wine isn't sold. It's a pattern we see repeatedly in restaurant financials - establishments that don't track this metric often discover they're losing twice what they expected.
💡 Formula:
Wine loss % = (Loss in euros / Total wine purchases) × 100
💡 Example:
Restaurant with €8,000 wine purchases per month:
- Oxidation: 6 bottles at €12 = €72
- Breakage: 2 bottles at €18 = €36
- Over-pouring: estimated €120
- Tastings/staff: €80
Total loss: €308 = 3.9% of purchases
Financial impact on an annual basis
Wine loss seems small per month, but it compounds fast:
💡 Annual calculation:
At 4% wine loss and €100,000 annual wine purchases:
- Loss: €4,000 per year
- This is pure profit that slips away
- At 65% wine margin you lose €6,150 in potential revenue
Over-pouring: the hidden cost
Over-pouring is often the biggest but least visible source of wine loss. A difference of 25ml per glass seems insignificant, but it devastates your margins.
💡 Impact of over-pouring:
Wine at €15/bottle (750ml), selling price €6/glass (150ml):
- Normal: 5 glasses per bottle
- Pouring 175ml: 4.3 glasses per bottle
- Loss: 0.7 glass = €4.20 per bottle
- At 50 bottles/week: €10,920 loss per year
⚠️ Heads up:
Measure your glasses regularly. A 150ml glass often gets filled to 170-180ml, especially during busy service. This bleeds more money than most owners realize.
Limit oxidation loss
Opened bottles lose quality quickly and need to be discarded. You can reduce this:
- Limit wine by the glass offering: Fewer open bottles
- Wine preservation systems: Coravin or vacuum pumps
- FIFO principle: Use oldest bottles first
- Daily checks: Check opened bottles for quality
Minimize breakage and transport damage
Physical damage to wine is often preventable with solid procedures:
- Safe storage: Bottles lying down, stable racks
- Careful transport: Use crates, don't stack
- Avoid temperature fluctuations: Corks can expand
- Delivery checks: Report damaged bottles immediately
Tools for wine management
Food cost calculators can track your wine purchases and sales to make loss visible:
- Register wine purchases per bottle with purchase price
- Track how many glasses you pour per bottle
- Automatically calculate your actual 'pour cost'
- Spot deviations in wine consumption quickly
How do you calculate wine loss? (step by step)
Register all wine purchases
Note all wine you purchase for a month. Both the number of bottles and the purchase price per bottle. This becomes your basis for the calculation.
Add up all the loss
Keep track of what gets thrown away: oxidation, breakage, tastings, staff. Note this daily and total it at the end of the month. Don't forget to include over-pouring.
Calculate the loss percentage
Divide the total loss in euros by your total wine purchases and multiply by 100. This gives you your loss percentage. Anything above 5% is on the high side.
✨ Pro tip
Track your top 8 wines by the glass for exactly 30 days. If you're getting fewer than 4.8 glasses per bottle at standard 150ml pours, you're hemorrhaging €200+ monthly through over-pouring alone.
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 wine loss percentage?
A loss percentage of 2-5% is considered normal for most restaurants. Above 5% there's likely over-pouring, poor storage or too many open bottles at once.
Should I count guest tastings as loss?
Yes, tastings cost money and should be included in your calculation. Many restaurants budget 1-2% of their wine revenue as standard loss for tastings.
How do I prevent staff from pouring too generously?
Use calibrated glasses with a fill line, train your staff on correct pour sizes and check regularly. A jigger or measuring cup helps with consistent portions.
Can I deduct wine loss from my taxes?
Normal business loss can usually be deducted as a business expense. Check with your accountant for specific rules and documentation requirements in your jurisdiction.
How long can I keep opened wine before it oxidizes?
Red wine usually lasts 3-5 days, white wine 3-7 days, depending on storage conditions. Always smell and taste first - oxidation is easy to recognize by the flat, vinegary smell.
Should I track loss differently for expensive vs cheap wines?
Absolutely - losing a €50 bottle hurts more than a €8 house wine. Track premium wines separately and consider using preservation systems for bottles over €25.
📚 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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