Most restaurants lose €200-400 monthly by tossing perfectly good ingredients. Vegetable scraps, day-old bread, and meat trimmings get dumped when they could become profitable menu items. Smart waste processing turns your trash into cash without buying a single extra ingredient.
What does waste processing deliver?
Waste processing transforms discarded ingredients into sellable products. Here's what you can create:
- Vegetable scraps → soup of the day (€4.50 per bowl)
- Stale bread → croutons or breadcrumbs for other dishes
- Meat and fish scraps → broth for sauces
- Leftover vegetables → staff meal (saves €8 per employee)
💡 Example:
Restaurant with 80 covers per day, 6 days per week:
- Soup of the day from vegetable scraps: 15 bowls at €4.50 = €67.50
- Staff meal from leftovers: 4 employees × €8 = €32.00
- Croutons from stale bread: €15 savings on purchasing
Daily total: €114.50
The calculation per week
Calculate your weekly extra revenue by tracking all sellable products from scraps:
Formula:
Weekly extra revenue = (Daily waste processing × Working days) + Weekend products
💡 Calculation example:
Bistro with 6 working days:
- Monday to Saturday: €114.50 per day
- Extra weekend broth: €25.00
Weekly total: (€114.50 × 6) + €25 = €712.00
Cost of waste processing
But waste processing isn't free. Factor in these costs:
- Labor cost: 1 extra hour prep per day × €15/hour = €15
- Energy: Extra cooking/blending = approximately €3 per day
- Extra ingredients: Spices, cream for soup = €8 per day
Net extra revenue = Gross revenue - Extra costs
💡 Net calculation:
From the €712 gross per week:
- Minus labor: €15 × 6 = €90
- Minus energy: €3 × 6 = €18
- Minus extra ingredients: €8 × 6 = €48
Net extra revenue: €712 - €156 = €556 per week
⚠️ Note:
Only count scraps you'd otherwise throw away. Don't include ingredients you'd normally use for other dishes.
Registration and tracking
Track what you create from scraps and what you sell. This shows whether waste processing stays profitable:
- Daily log: how much soup sold from vegetable scraps
- Weekly total: total extra revenue
- Monthly check: does the time/revenue ratio remain good?
Food cost management tools help you record waste processing recipes and automatically calculate cost prices. So you'll know if your vegetable scrap soup still generates profit. This mistake - not tracking waste processing profitability - costs the average restaurant EUR 200-400 per month in missed opportunities or unprofitable processes.
How do you calculate extra revenue from waste processing?
Inventory your daily scraps
Note for a week what you throw away: vegetable scraps, stale bread, leftover meat. Add up how many kilos per category you have on average per day.
Determine what you can make from it
Look at which sellable products you can make from each scrap category: soup from vegetables, croutons from bread, broth from bones. Calculate how many portions that yields.
Calculate revenue and costs
Multiply number of portions × selling price for your gross revenue. Subtract labor, energy and extra ingredients for your net weekly earnings.
✨ Pro tip
Track your waste processing revenue for exactly 2 weeks to establish your baseline. You'll discover which scraps generate the most profit and optimize your weekly processing schedule accordingly.
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
Which scraps are most profitable to process?
Vegetable scraps for soup usually generate the most: low extra costs, high selling price (€4-6 per bowl). Stale bread for croutons also saves a lot on purchasing.
How much time does waste processing take on average per day?
About 30-60 minutes of extra prep work. Making soup from vegetable scraps takes the most time, making croutons from stale bread is fastest.
Can I reuse everything for HACCP?
No, stick to the 4-hour rule for hot products and always check temperatures. Register what you reuse and when, for food safety.
📚 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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