Most restaurants track every euro spent on ingredients, yet ignore the biggest hidden cost in their kitchen. While you carefully calculate portion costs, those containers of peels, bones, and trim going to waste represent real money you've paid but can't recover. This invisible leak drains margins daily without appearing on any report.
Why trim waste stays invisible
You buy a whole salmon of 2 kilos for €18 per kilo. Head, tail, bones and skin go to waste. You're left with 1.1 kilos of fillet. Most operators think: 'I pay €18 per kilo salmon.' But you're actually paying for fillet that costs much more.
💡 Example:
Whole salmon of 2 kg:
- Purchase price: €36.00 (2 kg × €18)
- Usable fillet: 1.1 kg
- Trim waste: 0.9 kg (45%)
Actual fillet price: €36 ÷ 1.1 kg = €32.73 per kilo
That extra €14.73 per kilo doesn't appear on your invoice. But you're paying for it. And if you calculate food cost with €18 instead of €32.73, your numbers become meaningless.
The psychological aspect
Trim waste doesn't register as 'loss' because it's expected. You know peels come off. It feels normal. That's why it's not treated as a cost item, but as 'that's just how cooking works'.
Plus, you see the waste physically, not financially. A container full of carrot peels looks like garbage. Not like €47 of lost revenue.
⚠️ Note:
Many suppliers deliberately quote prices before processing. They know most operators won't calculate through to the actual cost per usable kilo after trim waste.
What trim waste really costs
Trim waste varies dramatically by product. And that variation directly impacts your margin:
- Fish (whole to fillet): 40-55% waste
- Beef (whole to portions): 15-25% waste
- Vegetables (peels): 15-25% waste
- Shrimp (unpeeled): 35-50% waste
💡 Example: Peeling carrots
You use 50 kg carrots per week:
- Purchase price: €1.20 per kg
- Peel waste: 20% (10 kg)
- Usable: 40 kg
Actual price: €60 ÷ 40 kg = €1.50 per kg instead of €1.20
Difference per year: €0.30 × 40 kg × 52 weeks = €624
Why the problem gets bigger
Suppliers regularly raise their prices. But you don't adjust your cost calculations because you're still thinking in the 'old' purchase price. The trim percentage stays constant, but the financial impact grows.
From tracking this across dozens of restaurants, I've seen many kitchens buy products requiring more processing to appear 'fresh'. Whole fish, uncut meat, unpeeled vegetables. That increases trim waste, but nobody calculates the additional costs.
💡 Example: Impact on food cost
Salmon fillet on menu for €28 (incl. 9% VAT):
- Sale price excl. VAT: €25.69
- 200g fillet × €32.73/kg = €6.55
- Other ingredients: €2.50
Food cost: €9.05 ÷ €25.69 = 35.2%
If you calculate with €18/kg: food cost appears to be 28.0%
How to make trim waste visible
Start with your 5 most-used products that you process yourself. Weigh for a week what you buy versus what you actually use. Calculate the actual cost per kilo with this formula:
Actual kilo price = Purchase price ÷ (100% - Trim waste%)
Update your recipes with these real prices. Then you'll see what each dish truly costs.
A food cost calculator like KitchenNmbrs can record trim waste per ingredient, so the actual cost price gets calculated automatically without manual math.
How do you calculate the actual costs of trim waste?
Measure the trim waste
Weigh your product before and after processing for a week. Note the difference. For example: 10 kg carrots becomes 8 kg after peeling = 20% waste.
Calculate the actual kilo price
Divide your purchase price by the yield percentage. At €1.20/kg and 20% waste: €1.20 ÷ 0.80 = €1.50/kg actual price.
Update your cost calculation
Use the actual kilo price in your recipes instead of the purchase price. Recalculate your food cost with the correct figures to see what each dish really costs.
✨ Pro tip
Weigh your trim waste containers for 3 consecutive days during your busiest prep period. You'll be shocked to discover those 'scraps' often represent €200-400 weekly in ingredients you've purchased but can't sell.
Calculate this yourself?
In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.
Was this article helpful?
Frequently asked questions
How much trim waste is normal for vegetables?
For vegetables, 15-25% trim waste from peels and trimming is normal. Carrots, potatoes and onions usually run around 20%. Bell peppers and cucumbers have less waste, around 10-15%.
Should I include trim waste in my food cost?
Absolutely yes. Trim waste represents real money you've spent. If you don't include it, your food cost appears lower than reality. This leads to incorrect pricing and eroded margins.
Why don't suppliers calculate with actual usable prices?
Because it would make their products appear more expensive. A whole salmon at €18/kg sounds more attractive than salmon fillet at €33/kg, even though you get identical end results. They know most buyers won't do the math.
How often should I remeasure trim waste percentages?
Once per quarter is sufficient, unless you change suppliers. Trim waste remains fairly consistent per product type. However, different suppliers can have varying quality levels that affect waste percentages.
📚 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.
Stop losing money in your kitchen
Most restaurants lose 5-15% margin due to invisible mistakes. KitchenNmbrs makes every euro visible — from purchase to plate. Start your free trial and discover where your money is leaking.
Start free trial →