Every baker watches their perfectly portioned dough shrink in the oven, but most don't realize how this quietly destroys their profit margins. Bread loses weight through evaporating moisture, pastry through waste and failed pieces. You need to calculate this loss and factor it into your selling price.
What is baking and preparation loss?
Baking and preparation loss represents the gap between ingredients you purchase and what actually reaches customers. This occurs at multiple stages:
- Weight loss during baking: bread loses 10-20% weight through evaporation
- Waste during processing: misshapen croissants, broken cakes
- Failed products: burnt bottoms, collapsed soufflés
- Cutting loss: cake edges, unsellable pieces
💡 Example of bread weight loss:
You put 10 kg of bread dough in the oven. After baking you have 8.2 kg of bread.
- Weight loss: 1.8 kg
- Loss percentage: (1.8 / 10) × 100 = 18%
- Yield: 82%
So your ingredients become 18% more expensive per kg of finished product.
How do you calculate the actual cost price?
Loss inflates your ingredient costs. You're left with less finished product, so each unit sold must absorb more overhead.
Formula for actual cost price:
Actual cost price = Ingredient costs / (Yield % / 100)
💡 Example of bread cost price:
Ingredients for 10 kg dough cost €12.00. After baking you have 8.2 kg of bread.
- Ingredient costs: €12.00
- Yield: 82%
- Actual cost price: €12.00 / 0.82 = €14.63 per 8.2 kg
- Per kg of bread: €14.63 / 8.2 = €1.78/kg
Without loss it would be €1.20/kg. Due to loss you pay €0.58 extra per kg.
Typical loss per product
Different products create different loss patterns. Here's what most kitchen managers discover too late - the variation is massive:
- White bread: 15-20% weight loss
- Whole wheat bread: 12-18% weight loss
- Croissants: 20-25% (weight + waste)
- Cake/pastries: 10-15% (cutting loss + failed)
- Soufflés/mousses: 15-25% (failed + shaping)
- Cakes: 8-12% (edge cutting loss)
⚠️ Note:
These percentages are guidelines. Measure your own loss for several weeks to get accurate figures.
Impact on your selling price
Ignoring loss means losing money on every single product. The financial impact can be staggering:
💡 Example of impact on croissants:
You sell croissants for €2.50 and calculate with €0.80 ingredient costs.
- Without loss: food cost 32% (€0.80 / €2.29 excl. VAT)
- With 22% loss: actual costs €1.03
- Actual food cost: 45% (€1.03 / €2.29)
- Loss per croissant: €0.23
At 100 croissants per day: €23 less profit per day = €8,395 per year.
Minimizing loss
You can't eliminate all loss, but you can control it:
- Maintain consistent oven temperature: prevents over- or under-baked products
- Monitor timing precisely: every extra minute increases weight loss
- Use consistent portioning: uniform dough weight creates predictable loss
- Repurpose leftover products: breadcrumbs for coating, cake edges for crumble
Track it digitally
Getting control over your loss requires consistent measurement and tracking. Most bakers rely on Excel, but it's incredibly time-consuming.
Tools like KitchenNmbrs let you record actual yields per product. The system then automatically calculates your true cost price including all losses.
How do you calculate the impact of preparation loss? (step by step)
Measure your actual loss
Weigh your ingredients before processing and your finished product after cooling. Do this for a week for each product to get an average.
Calculate your yield percentage
Yield % = (Finished weight / Starting weight) × 100. If you get 8.2 kg of bread from 10 kg of dough, your yield is 82%.
Calculate actual cost price
Divide your ingredient costs by your yield percentage. With €12 ingredients and 82% yield: €12 / 0.82 = €14.63 actual costs.
Adjust your selling price
Use the actual cost price for your food cost calculation. At 30% desired food cost: minimum selling price = actual costs / 0.30.
✨ Pro tip
Track your actual yields for 6 weeks during different weather conditions - humidity changes can shift your loss percentages by 3-4%. Most bakers only measure during one season and miss these crucial variations.
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
How much weight loss is normal for artisan breads versus commercial loaves?
Artisan breads with higher hydration typically lose 18-22% weight during baking. Commercial breads with additives and lower hydration lose around 12-16%. The longer fermentation in artisan breads also contributes to higher moisture loss.
Should I calculate loss differently for seasonal products?
Absolutely. Humidity affects baking loss significantly - summer months often see 2-3% higher loss rates. Holiday items like stollen or fruitcakes have different loss patterns due to alcohol content and fruit moisture.
What's the most accurate way to measure preparation loss for laminated dough?
Weigh your butter block and dough separately before laminating, then weigh finished croissants after baking and cooling. Don't forget to include scraps from cutting - they're often 15-20% of your total loss.
📚 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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