Waste from minibar products like drinks, snacks and small dishes can add up quickly, but is often forgotten in cost calculations. At events and catering, products are always lost due to damage, theft or misjudging demand. Here's how to correctly account for waste in your cost price so you don't unknowingly lose money.
What is waste and why account for it?
Waste represents the loss of products without generating any revenue from them. With minibar products and catering, this happens through:
- Damage during transport
- Theft by guests or staff
- Products that expire
- Broken glass bottles
- Overbooking for the event
If you don't account for waste in your cost price, it eats into your profit. A waste percentage of 5% means your food cost is actually 5% higher than you think.
⚠️ Note:
Many entrepreneurs only calculate the products they sell, not what gets lost. This makes your margin look higher than it actually is.
Calculate your waste percentage
To account for waste correctly, you first need to know how much you lose on average. Measure this over at least 3 months:
Waste percentage = (Total waste in € / Total purchases in €) × 100
💡 Example:
Month 1: €2,400 purchased, €180 waste
Month 2: €2,800 purchased, €210 waste
Month 3: €2,200 purchased, €165 waste
Total: €7,400 purchased, €555 waste
Waste percentage: (€555 / €7,400) × 100 = 7.5%
Account for waste in your cost price
Once you know your waste percentage, include it in every cost calculation:
Cost price including waste = Basic ingredient costs × (1 + waste percentage / 100)
💡 Example cost calculation:
Basic minibar costs per person: €8.50
Waste percentage: 7.5%
Cost price including waste: €8.50 × 1.075 = €9.14
Difference: €0.64 per person more than you thought
For 200 guests, this means €128 in extra costs you would otherwise forget. Over a full year, this can add up to thousands of euros.
Different types of waste
Not all waste is the same. Break it down for a better picture:
- Structural waste: Always happens (breakage, theft) - 3-5%
- Seasonal waste: Due to shelf life in quiet periods - 2-8%
- Event waste: Misjudging per event - 5-15%
- Transport waste: Damage in transit - 1-3%
💡 Example by type:
Wedding (200 people):
- Structural waste: 4% = €68
- Event waste: 8% = €136
- Transport waste: 2% = €34
Total waste: 14% = €238 extra costs
Prevent unnecessary waste
Waste can't be completely prevented, but it can be reduced:
- Order 5-10% less than your estimate (build experience)
- Use sturdy transport crates for fragile products
- Check minibar after each event for theft
- Rotate stock according to FIFO (first in, first out)
- Make agreements with suppliers about returns
⚠️ Note:
Ordering too little is also costly. If you don't have enough drinks, you miss out on revenue. Find the balance between waste and lost sales.
Recording and monitoring
Track waste per event and per product category. This helps you identify patterns - the kind of thing you only learn after closing your first month at a loss:
- Which products are lost the most?
- Which type of events have the highest waste?
- Which suppliers have the most breakage?
A food cost calculator can help you record waste per event and automatically include it in future cost calculations. This saves manual tracking and prevents you from forgetting it.
How do you account for waste in your cost price? (step by step)
Measure your waste percentage over 3 months
Track what you purchase and what gets lost due to breakage, theft or spoilage. Divide total waste by total purchases and multiply by 100 for the percentage.
Calculate cost price including waste
Multiply your basic costs by (1 + waste percentage/100). At 8% waste and €10 basic costs, this becomes €10 × 1.08 = €10.80 per person.
Adjust your selling price for healthy margin
Use the cost price including waste to calculate your minimum selling price. At 30% desired food cost and €10.80 costs, your minimum price is €36.00 excl. VAT.
✨ Pro tip
Track waste separately for beer, wine, and spirits over 8 weeks - alcohol breakage rates vary dramatically by container type. Beer bottles break 3x more often than wine bottles during transport.
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 waste percentage for minibar products?
For catering and events, 5-12% is normal, depending on the type of event and products. Structural waste (always present) usually runs around 3-5%, event-specific waste can reach up to 15% for difficult-to-estimate events.
Should I invoice waste separately to customers?
No, waste is part of your cost price and is built into your selling price. It's a business risk that you cover by including it in your calculation, not a separate cost item.
How do I prevent high waste at outdoor events?
Use sturdy transport crates, plan extra cooling for hot days, and order 10-15% less than your initial estimate. Build experience per location and season to estimate better.
Can I deduct waste from my taxes?
Waste from spoilage, breakage or theft is usually deductible as business expenses. Keep good records with photos and descriptions. Consult your accountant for specific situations.
What if my waste suddenly becomes much higher?
Analyze immediately what changed: new supplier, different type of events, different transport method? Adjust your waste percentage once you have 3 months of new data to keep your cost prices accurate.
How often should I recalculate my waste percentages?
Review your waste percentages every quarter, especially after seasonal changes or major events. If you notice waste consistently above or below your calculated percentage for 6 weeks, it's time to adjust your formula.
📚 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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