Ever wondered what that weekly batch of stock actually costs you per liter? You're simmering bones and vegetables for hours, but pinning down the exact cost gets complicated. Multiple ingredients, long cooking times, and volume reduction all factor into your final price.
Why the cost price of batch preparations matters
Quality stock demands time and premium ingredients. Without knowing your true costs, you can't price menu items accurately. And since stock serves as the foundation for multiple sauces and dishes, getting this calculation wrong affects your entire profit margin.
💡 Example:
You make 5 liters of beef stock for the whole week:
- 2 kg beef bones: €8.00
- Vegetables (onion, carrot, celery): €3.50
- Herbs and spices: €1.20
- Gas for 6 hours simmering: €2.80
Total: €15.50 for 5 liters = €3.10 per liter
Include all costs in the calculation
Batch preparations hide expenses that add up fast. Don't overlook:
- Primary ingredients: bones, meat, vegetables
- Aromatics: herbs, wine, bouquet garni
- Energy costs: gas or electricity for extended cooking
- Labor time: prep work, monitoring, straining
- Reduction losses: starting with 8 liters but finishing with 5
⚠️ Note:
Always calculate using final volume after reduction, not initial volume. Your concentrated stock carries higher value and cost per liter.
Calculate cost price per portion
Once you've determined your per-liter cost, portion calculations become straightforward. From analyzing actual purchasing data across different restaurant types, most establishments use 100-200ml of stock per dish depending on the preparation method.
💡 Example:
Your stock costs €3.10 per liter. For a braised dish you use 150ml stock per portion:
Stock cost per portion: €3.10 × 0.15 = €0.47
Estimate energy costs
Extended cooking times create significant energy expenses. Current estimates show:
- Gas burner on low heat: approximately €0.40-0.50 per hour
- Electric cooktop: approximately €0.60-0.80 per hour
- Oven at 160°C: approximately €0.80-1.20 per hour
A stock simmering for 6 hours will cost €2.40-3.00 in energy alone.
Include shelf life and waste
Batch preparations spoil before complete usage. Factor in 5-10% waste to reflect reality:
💡 Example:
Your stock costs €15.50 for 5 liters. With 10% waste:
Actual cost price: €15.50 ÷ 4.5 liters = €3.44 per liter
Track digitally to save time
Manual batch cost calculations eat up valuable kitchen time. Systems like KitchenNmbrs let you configure batch recipes once, then automatically calculate per-liter costs. You'll instantly see what each dish costs that incorporates your stock.
How do you calculate the cost price of batch preparations? (step by step)
Gather all ingredient costs
Write down the price of all ingredients: main products, vegetables, herbs, wine. Don't forget small amounts like peppercorns or bay leaves.
Calculate energy and labor time
Estimate energy costs (€0.40-0.50 per hour gas) and any labor time. For stock that simmers for 6 hours, budget approximately €2.50-3.00 in energy costs.
Divide by final volume
Add up all costs and divide by the volume you have left after reduction. Budget an extra 5-10% for possible waste during the week.
✨ Pro tip
Weigh your finished stock instead of measuring volume - 1 liter equals roughly 1 kg, and scales give more precise measurements than liquid measuring cups after a 6-8 hour cooking process.
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 include labor time in the cost price of stock?
For basic calculations, skip labor costs since stock often gets made during slower periods. But for precise cost analysis, definitely include labor expenses.
How long can I store and use stock?
Fresh stock lasts 3-4 days refrigerated, or up to 3 months frozen. Plan your weekly usage carefully to minimize waste.
What if I make different types of stock?
Calculate each variety separately. Beef stock costs significantly more than vegetable stock due to expensive bones. Chicken and fish stocks fall between these extremes.
How do I account for reduction losses?
Measure final volume after straining and complete cooling. Expect 30-40% volume loss through reduction and evaporation during proper stock preparation.
Can I ignore energy costs for small quantities?
Small batches under 2 liters make energy costs negligible. Large batches simmering 4-8 hours easily rack up €3-5 in energy expenses per batch.
What's the most accurate way to measure stock temperature impact on volume?
Always measure stock volume at room temperature, not while hot. Hot liquids expand significantly, giving false volume readings that skew your cost calculations.
📚 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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