Think of yield percentage like a magician's disappearing act - you buy a whole chicken, but only 60% of it actually makes it to the plate. Many restaurant owners ignore this vanishing act and end up bleeding money without realizing why. Understanding yield percentage transforms how you calculate true food costs.
What is yield percentage?
Yield percentage shows how much of your purchased product remains usable after processing. Buy a 2 kg chicken for €12, fillet it down to 1.2 kg of meat, and you've got a 60% yield.
💡 Example:
Whole salmon purchase:
- Weight: 3 kg for €54 (€18/kg)
- After filleting: 1.6 kg fillet
- Yield: 1.6 / 3.0 × 100 = 53%
Actual fillet price: €18 / 0.53 = €33.96/kg
The formula for actual cost price
Here's the math that'll save your margins:
Actual cost price = Purchase price / (Yield percentage / 100)
You divide by yield percentage - never multiply. Less usable product means higher cost per kilo.
⚠️ Watch out:
Many entrepreneurs calculate €18 × 0.53 = €9.54. That's completely backwards! Less product means higher costs, not lower.
Different types of loss
Your yield drops for several reasons:
- Cutting loss: bones, skin, fat that gets tossed
- Peeling loss: vegetable and fruit peels
- Trim loss: damaged portions you can't serve
- Cooking loss: moisture that evaporates during prep
💡 Example cooking loss:
Raw 250g steak shrinks to 200g when cooked:
- Cooking yield: 200/250 × 100 = 80%
- Raw steak at €32/kg
- Cooked steak costs: €32 / 0.80 = €40/kg
Measuring yield in practice
Track yield by processing identical products multiple times and averaging results. From years of working in professional kitchens, I've learned that consistency in measurement prevents costly surprises later.
- Purchase weight (invoice amount)
- Usable weight post-processing
- Date and supplier (yields fluctuate)
Measure at least 3 times for reliable averages. Seasonal changes and different suppliers affect yields significantly.
💡 Example yield tracking:
3 whole chicken measurements:
- Test 1: 2.1 kg → 1.3 kg fillet (62%)
- Test 2: 1.9 kg → 1.1 kg fillet (58%)
- Test 3: 2.0 kg → 1.2 kg fillet (60%)
Average yield: 60%
Incorporating yield into your recipes
Building a recipe requiring 200g salmon fillet? Calculate backwards to determine purchase quantity:
Required purchase = Recipe quantity / (Yield / 100)
For 200g salmon fillet at 53% yield, you'll need 200 / 0.53 = 377g whole salmon.
Typical yield percentages
These numbers provide starting points, but always verify with your own measurements:
- Fish (whole → fillet): 45-55%
- Chicken (whole → fillet): 55-65%
- Beef (whole → portions): 70-80%
- Potatoes (peeled): 80-85%
- Onions (peeled): 88-92%
- Carrots (peeled): 85-90%
⚠️ Watch out:
These are rough guidelines only. Actual yields vary by supplier, season, and processing methods. Always test your critical ingredients personally.
Impact on your food cost
Yield miscalculations devastate profit margins. Calculate salmon at €18/kg instead of the true €34/kg, and you're off by 89%.
Consider 50 weekly salmon dishes at 180g fillet each:
- Incorrect calculation: 50 × 0.18 × €18 = €162/week
- Accurate calculation: 50 × 0.18 × €34 = €306/week
- Gap: €144 weekly = €7,488 annually
Tools like KitchenNmbrs can automate these calculations and prevent such costly errors.
How do you calculate yield percentage? (step by step)
Measure the purchase weight
Weigh your product as you purchase it. Record the exact weight that's on the invoice. This is your starting point for the calculation.
Process the product completely
Process the product as you normally do: fillet, peel, cut. Weigh the usable end product that you actually use in your dish.
Calculate the yield percentage
Divide the usable weight by the purchase weight and multiply by 100. Formula: (Usable weight / Purchase weight) × 100 = Yield%.
Calculate the actual cost price
Divide your purchase price by the yield percentage (as decimal). Formula: Purchase price / (Yield% / 100) = Actual cost price per kg usable product.
Update your recipes
Use the actual cost price in your recipes and cost price calculations. Check this regularly because yield can change per supplier or season.
✨ Pro tip
Test your yield calculations on your 3 highest-cost proteins every 6 weeks. Small yield changes on expensive ingredients can swing monthly food costs by hundreds of euros.
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
Do I need to measure yield for every ingredient?
Focus on expensive ingredients with significant loss potential. Meat, fish, and premium vegetables create the biggest cost impact when yield calculations go wrong.
How often should I update my yield percentages?
Review key ingredients quarterly. Seasonal products or new suppliers require immediate re-measurement since yields can shift dramatically.
What if my yield is lower than expected?
Investigate supplier changes or processing variations first. Lower yields mean higher costs, so menu pricing adjustments might be necessary.
Can I use yield percentages from the internet?
Online figures work as rough estimates, but measure personally for accuracy. Your supplier, season, and processing methods create unique yield patterns that generic numbers can't capture.
How do I factor cooking loss into my yield?
Weigh ingredients before and after cooking separately. Steaks typically lose 20-25% weight during cooking, which compounds on top of initial cutting losses.
Should I account for yield differently during busy service periods?
Yes, rushed prep work often reduces yield efficiency. Track yields during peak times separately and factor in the 5-10% additional loss that typically occurs during high-pressure service.
📚 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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