Waste in a restaurant is all costs you incur without getting revenue in return. The difference between what you purchase and what you actually s...
Most restaurant owners don't realize they're throwing away 10-15% of their profits every single day. Waste isn't just the moldy tomatoes you toss in the bin. It's every euro you spend that doesn't come back to you through sales.
What are the different types of waste?
Every kitchen bleeds money in ways you might not even notice. Each type hits your bottom line differently, but they all add up fast.
💡 Example of waste types:
- Spoilage: €50 worth of vegetables that sit too long
- Trimming loss: 40% of whole fish becomes waste
- Overproduction: 20 portions of soup left over that get thrown away
- Staff consumption: €15 per day in free meals
- Theft: ingredients that disappear
This can quickly become €200+ per week.
Trimming loss and processing waste
Here's what separates amateur calculations from professional ones: the gap between what you buy and what actually makes it to the plate. Most restaurant owners mess this up completely.
- Whole fish → fillet: often 45-55% loss
- Whole chicken → portions: about 25% loss
- Peeling vegetables: 15-25% loss
- Trimming meat: 10-20% loss
💡 Calculation example trimming loss:
You buy whole salmon for €18 per kilo:
- Purchase price: €18/kg
- Trimming loss: 50% (head, bones, skin)
- Yield: 50%
Actual fillet price: €18 ÷ 0.50 = €36/kg
⚠️ Watch out:
Many entrepreneurs calculate with the purchase price (€18) instead of the actual price (€36). This makes your food cost appear lower than it actually is.
Spoilage and shelf life
Ingredients that expire before you can sell them are pure profit killers. From years of working in professional kitchens, I've seen restaurants lose hundreds weekly just from poor rotation habits.
- Bought too much for the weekend
- Seasonal products that don't get sold
- Wrong storage (temperature, humidity)
- No FIFO system (first in, first out)
Overproduction and leftovers
Every portion you prep but don't sell is money down the drain. Daily specials are the biggest culprits here.
💡 Example overproduction:
You make soup for 30 portions every day:
- Ingredient costs per portion: €2.50
- Average 5 portions left over per day
- Loss per day: 5 × €2.50 = €12.50
Per month: €12.50 × 25 days = €312.50 loss
Staff consumption
Staff meals aren't free, even if you don't charge for them. They're a real cost that needs tracking and planning.
- Free meals for staff
- Drinks during work hours
- Tasting new dishes
- Extra portions or ingredients
How do you calculate total waste?
You can't manage what you don't measure. Start by tracking everything for one full week to see where your money actually goes.
⚠️ Watch out:
Waste of 5-8% of your purchases is normal. Above 10% becomes expensive. Above 15% eats into your profit.
Track different waste categories separately to identify your biggest money leaks. Once you know where the problems are, you can actually fix them.
How do you calculate waste in your restaurant?
Track everything for a week
Note down daily what gets thrown away, what's left over and what staff consumes. Estimate the value of each item. This gives you a realistic picture of your daily waste.
Calculate your trimming loss per product
Measure for your main ingredients what you purchase versus what you can sell. Divide the usable weight by the purchase weight and multiply by 100 for the yield percentage.
Add up all waste types
Sum up spoilage, trimming loss, overproduction and staff consumption. Divide this by your total purchases and multiply by 100. This gives you your waste percentage for that week.
✨ Pro tip
Weigh your food waste bin for exactly 7 days and multiply by 52 weeks. Most owners are shocked to discover they're throwing away €3,000-5,000 annually in perfectly good ingredients.
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 a restaurant?
A waste percentage of 5-8% of your purchases is normal. Above 10% becomes expensive and above 15% eats into your profit. Fine dining restaurants often have slightly higher waste due to more complex preparation.
How do you prevent too much spoilage in the kitchen?
Work with FIFO (first in, first out), don't buy too much at once and check your inventory daily. Plan your menu based on what needs to be used up and use leftovers creatively in daily specials or soups.
Should I include trimming loss in my cost price calculation?
Yes, absolutely. If you buy whole fish for €18/kg but have 50% loss, you're actually paying €36/kg for the fillet. Always calculate with the actual price after processing.
How do I track staff consumption without being intrusive?
Make clear agreements about staff meals and track this as a cost item. Calculate for example €8 per staff member per shift. This way you know what it costs and it stays fair.
What do I do with seasonal products that don't get sold?
Plan seasonal products well and actively communicate them to guests. Leftover products can often be processed into soups, sauces or specials. Or sell them at cost price to staff.
How do I calculate the financial loss from overproduction?
Add up the ingredient costs of leftover portions. Do this for a week and calculate monthly costs. Often you'll be shocked by the amount and start portioning more consciously.
📚 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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