Track food waste daily using the formula: (Value thrown away / Total purchases) × 100. Aim for 4-7% depending on your restaurant type. Check coolers every morning, record everything you discard, and investigate immediately if waste exceeds 8% for two weeks running.
Are you throwing away more money than you realize every single day? Most restaurant owners know they have food waste but have no clue about the actual numbers. What feels like "just a few expired items" can easily cost you thousands per year.
What is food waste and why does it matter?
Food waste covers everything you purchase but can't sell to customers. The main culprits include:
- Spoilage: products that go past their date
- Waste: overproduction, thrown away food
- Trim loss: unusable parts (bones, peels)
- Mistakes: incorrectly prepared dishes
- Theft: staff or customers taking products
Most restaurants lose between 4% and 8% of their purchases to food waste. Seems minor? On an annual turnover of €500,000, you're looking at €15,000 to €30,000 walking straight into the bin.
💡 Example:
Restaurant with €8,000 in purchases per month:
- At 4% waste: €320 per month = €3,840 per year
- At 8% waste: €640 per month = €7,680 per year
Difference: €3,840 per year in extra losses
How do you measure food waste?
You can't control what you don't measure. Here's the formula that actually works:
Food waste % = (Value thrown away / Total purchases) × 100
You'll need to track these three things consistently:
- What you buy (value and quantity)
- What you throw away (value and reason)
- What you sell
⚠️ Important:
Most kitchens track quantities but ignore values. A kilo of spoiled salmon hits your bottom line way harder than a kilo of old potatoes.
What are acceptable food waste percentages?
Your target percentage depends entirely on your kitchen type. Here's what works in practice:
- Fine dining: 3-6% (fresh products, complex dishes)
- Bistro/brasserie: 4-7% (mixed menu)
- Casual dining: 2-5% (standard products)
- Fast food: 1-3% (shelf-stable products, standard portions)
💡 Example calculation:
Bistro with €6,000 in purchases per month:
- Thrown away: €180 in spoilage
- Thrown away: €120 in waste
- Total thrown away: €300
Food waste: (€300 / €6,000) × 100 = 5% - under control
Daily food waste checks
Don't wait until month-end to discover problems. Build these checks into your daily routine:
Every morning (5 minutes):
- Check all refrigerators for products expiring today
- Note what you throw away and why
- Estimate the value of discarded product
During service:
- Keep track of which dishes come back to the kitchen
- Note preparation mistakes
- Count what's left over from daily specials at the end
This is the kind of thing you only learn after closing your first month at a loss - small daily losses add up faster than you'd expect.
💡 Practical example:
Monday morning check:
- 2 kg salmon past date: €36 loss
- 1 container brown lettuce: €3 loss
- Sunday special: 3 portions left over = €24 loss
Total: €63 waste in one day
Signs that food waste is getting out of control
These red flags mean you need to act immediately:
- Waste above 8% for 2 weeks in a row
- Same product repeatedly being thrown away
- Rising trend: more waste every week
- No clear cause: you don't know why you're throwing so much away
⚠️ Important:
If your waste suddenly drops to 0-1%, check whether your staff is actually recording everything. Zero waste doesn't exist in real kitchens.
Digital tracking vs. paper
Paper tracking sounds simple but creates more problems than it solves:
- Lists get lost
- Nobody adds up the values
- No overview of trends
- Hard to look back
Digital systems solve these headaches by:
- Automatically calculating values
- Showing trends over weeks and months
- Alerting you to high waste
- Keeping everything centralized
But remember: no app registers waste automatically. You still need to track what gets thrown away.
How do you check food waste? (step by step)
Set up a waste log
Create a list where you note every day what you throw away, how much and why. Use a notebook, Excel or an app like KitchenNmbrs. Make sure everyone in the kitchen knows they need to record.
Calculate the value of discarded product
Add up each week how many euros in products you've thrown away. Use your purchase prices. A kilo of salmon at €18 that you throw away costs you €18, not the selling price.
Calculate your food waste percentage
Divide the value of discarded product by your total purchases and multiply by 100. At €200 waste on €5,000 purchases = 4%. Check this every week.
Analyze patterns and causes
Look at what you throw away often. Always the same products? Always on the same day? Find the cause: overpurchasing, poor storage, or bad planning?
Take action on high waste
If waste is above 8% for 2 weeks: adjust your purchases, train staff on storage, or change your menu. Then measure if it helps.
✨ Pro tip
Weigh your waste bin at the same time each morning for 7 days straight. If it's getting heavier daily, you've got a growing problem even before calculating percentages.
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
Should I count trim loss in my food waste percentage?
No, trim loss belongs in your cost price calculation, not waste tracking. Food waste only covers products you throw away after purchase - not the bones, peels, and stems you always discard during prep.
What if my waste suddenly jumps to 10% or higher?
Check your refrigerator temperatures, recent deliveries, and storage procedures immediately. A sudden spike usually points to one fixable problem - a broken cooler, bad delivery, or storage mistake. Don't wait to investigate.
How do I get staff to actually record waste instead of just tossing things?
Make recording part of the routine, not an extra task. Whoever checks the cooler also logs the waste - same person, same time, every day. Explain it's about saving money for everyone, not finding someone to blame.
📚 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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