A restaurant making fresh tomato sauce daily spends 45 minutes each morning on prep, setup, and cleanup. Batch that same sauce for three days? You're looking at just 90 minutes total. The math seems obvious, but calculating real time savings means factoring in inventory costs and spoilage risks.
What is batch production in the kitchen?
Batch production means making larger quantities of basic preparations than you need that day. Think of:
- Chopping vegetables for 3-4 days
- Making stock for a whole week
- Preparing base sauces in large portions
- Preparing marinades for multiple services
The goal: less daily prep time, more consistency, and smoother services.
Calculating time savings per preparation
For each basic preparation, you calculate the time savings by dividing the setup time across more portions.
💡 Example: Chopping onions
Chopping 2 kg onions daily:
- Setup, chopping, cleanup: 25 minutes
- Per day: 25 minutes × 6 days = 150 minutes
Batch of 12 kg (for 6 days):
- Setup, chopping, cleanup: 80 minutes
- Savings: 150 - 80 = 70 minutes per week
The formula: Time savings = (Daily time × Number of days) - Batch time
Distinguishing setup time from production time
Not all time scales proportionally. You need to distinguish between setup time (preparing equipment, cleanup) and production time (actual chopping/cooking).
- Setup time: Remains the same, regardless of quantity
- Production time: Scales linearly with quantity
- Cleanup time: Stays mostly the same
💡 Example: Chicken stock
Making 2 liters of stock daily:
- Setup (ingredients, pan): 10 minutes
- Cooking: 15 minutes active time
- Cleanup: 10 minutes
- Total: 35 minutes per day
Batch of 10 liters (5 days):
- Setup: 10 minutes (same)
- Cooking: 35 minutes active time
- Cleanup: 15 minutes (slightly more)
- Total: 60 minutes
Savings: (35 × 5) - 60 = 115 minutes per week
Accounting for extra inventory costs
Batch production means holding more inventory. This costs money in the form of:
- Capital costs (money tied up in inventory)
- Cooling space
- Risk of spoilage
- Energy costs for cooling
⚠️ Note:
Factor in the risk of spoilage. If 10% of your batch gets thrown away, that costs extra. Include this in your time savings calculation.
ROI calculation: time vs. inventory costs
To determine if batch production is worthwhile, compare the value of time savings with the extra inventory costs. From tracking this across dozens of restaurants, the sweet spot usually falls between 3-5 day batches for most preparations.
💡 Example: Complete calculation
Tomato soup batch for 4 days:
- Time savings: 90 minutes per week
- Value of time (€20/hour): €30 per week
- Extra inventory: €40 (3 days extra)
- Capital costs (5% per year): €0.10 per week
- Spoilage risk (5%): €2 per week
Net savings: €30 - €0.10 - €2 = €27.90 per week
Which preparations are most worthwhile?
Focus on preparations with high setup time and low spoilage risk:
- High potential: Stocks, base sauces, chopped vegetables
- Moderate potential: Marinades, dressings
- Low potential: Fresh salads, delicate preparations
Start with the preparations that cost you the most time and keep well.
Digitally tracking batch planning
Keep track of when you made which batch and when it runs out. This helps optimize your planning.
With a system like KitchenNmbrs you can create batch recipes and track when you've prepped large quantities, so your team knows what's available.
How do you calculate time savings from batch production?
Measure current daily prep time
Note for each basic preparation how much time you spend on it daily. Break it down into setup time, production time, and cleanup time.
Calculate batch time for desired period
Determine how much time a batch for 3-5 days takes. Setup and cleanup stay the same, production time scales up with quantity.
Subtract batch time from total daily time
Formula: (Daily time × Number of days) - Batch time = Time savings. Multiply by your hourly rate to calculate the value.
✨ Pro tip
Track your actual prep times for mirepoix over 2 weeks - daily chopping versus one 14-day batch. Most kitchens save 3.5 hours weekly once they nail the timing.
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 time can I save at most with batch production?
This depends on your current prep routine, but 2-4 hours per week is realistic for an average restaurant. Focus first on preparations with lots of setup time.
Which preparations are least suitable for batches?
Fresh salads, delicate fish preparations, and anything that spoils within 24 hours. The time savings won't outweigh the risk of food waste.
How do I prevent batches from spoiling before they're used?
Plan your batches based on your sales data from previous weeks. Start with smaller batches and scale up as you better understand demand.
Should I account for quality loss with longer storage?
Yes, some preparations lose flavor or texture after a few days. Test small batches first to determine what the maximum shelf life is without quality 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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