Most chefs think trim waste is just part of cooking - but that's a costly myth. Those containers of peels, bones and trimmings walking out your back door carry hidden euros with them. Your food costs stay broken because you're not tracking what this waste actually costs you.
Why waste costs invisible money
Daily waste exits your kitchen. Fish bones, vegetable peels, meat trimmings. Feels natural, right? But each gram carries a price tag you're ignoring.
You purchase whole salmon at €18 per kilo. After filleting, you've got 1.1 kilos of fillet from a 2 kilo fish. Those 900 grams of bone, skin and head just cost you €16.20. It vanishes into the bin, but never appears in your cost calculations.
💡 Example:
You purchase 10 kilos of whole salmon for €180.
- Purchase price: €18/kg
- Waste (bone, skin, head): 45%
- Usable fillet: 5.5 kg
- Real fillet price: €180 / 5.5 kg = €32.73/kg
You're losing €14.73 per kilo if you calculate with €18 instead of €32.73.
The gap between purchase price and real cost price
What you pay your supplier isn't what you should use for cost calculations. Trim loss makes every usable gram pricier.
Formula for real cost price:
Actual price per kg = Purchase price / (Yield % / 100)
⚠️ Attention:
Many operators multiply by the yield. That's backwards. You divide by the yield, because you end up with less product.
Standard trim loss per product
Each ingredient has its own waste percentage. Here's what you'll typically see:
- Fish (whole to fillet): 40-55%
- Beef (whole to portions): 15-25%
- Shrimp (unpeeled to peeled): 35-50%
- Vegetables (peels): 15-25%
- Potatoes: 15-20%
- Onions: 8-12%
💡 Beef example:
You purchase a whole hare of 3 kg for €45/kg = €135 total.
- Trim loss (fat, sinews): 20%
- Usable meat: 2.4 kg
- Real price: €135 / 2.4 kg = €56.25/kg
If you calculate with €45/kg instead of €56.25/kg, you're losing €11.25 per kilo.
The damage to your food cost
Ignore trim loss and your food cost won't balance. You think a dish runs 28% food cost, but it's actually 35%. That difference comes straight from your profit.
With €400,000 annual revenue, every food cost percentage point costs you €4,000 yearly. If you're 5 points low because of trim loss, you're bleeding €20,000 annually.
💡 Impact example:
Restaurant with €500,000 annual revenue.
- Calculated food cost: 30%
- Real food cost (with trim loss): 36%
- Difference: 6 percentage points
- Annual loss: 6% × €500,000 = €30,000
That's €2,500 monthly leaking away unnoticed.
How to fix this
The solution's straightforward: calculate with real cost prices instead of purchase prices. From tracking this across dozens of restaurants, measuring trim loss 3-4 times gives you a reliable percentage for ongoing calculations.
Many operators use tools like KitchenNmbrs to track this. You enter the trim loss once per product, and the system automatically calculates real cost prices for all recipes.
Your first move
Pick your 3 priciest ingredients. Measure the trim loss. Calculate the real cost price. Update your recipes with these prices. You'll discover your food cost runs higher than expected.
That's not bad news. It's reality. And with reality, you can steer properly.
How do you calculate the actual cost price? (step by step)
Measure the trim loss
Weigh the product before and after processing. Calculate the difference: ((purchase weight - usable weight) / purchase weight) × 100. Do this at least 3 times for a reliable average.
Calculate the yield
Yield = 100% - trim loss%. For example: 45% trim loss = 55% yield. You'll use this percentage in the formula for the actual cost price.
Calculate the actual cost price
Divide the purchase price by the yield: actual price = purchase price / (yield% / 100). For example: €18/kg / 0.55 = €32.73/kg. This is the price you should use in your recipes.
✨ Pro tip
Track your heaviest waste bins for 3 consecutive days - the ingredients filling them fastest are costing you the most in hidden trim losses. Those products need immediate yield calculations.
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 measure trim loss every single prep?
No, measure it 3-4 times and average the results. You can use this percentage for months unless you switch suppliers or change quality grades.
What if my trim loss exceeds industry standards?
Check your prep techniques first - improper cutting inflates waste. Then verify supplier quality. Sometimes high waste is normal for budget ingredients, but often you can improve it through better training or sourcing.
Can I monetize trim waste instead of trashing it?
Sometimes you can - fish bones for stock, vegetable scraps for compost, bones for jus. But don't build your cost calculations around this. Treat any waste revenue as bonus income, not a cost offset.
📚 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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