Wrong batch sizes cost restaurants 20-30% extra through waste or labor inefficiency. Too small batches eat up precious kitchen time, while oversized batches create costly spoilage if your new dish flops. Finding that sweet spot requires balancing three key factors.
Why batch size matters
With a new dish you don't yet know how popular it'll become. Make too much at once and it goes past its date. Make too little and you're constantly cooking again during service.
⚠️ Watch out:
A wrong batch size can cost you 20-30% extra through waste or extra labor time.
The 3 factors that determine batch size
Your optimal batch size depends on three things:
- Shelf life: How many days does the dish stay good?
- Expected sales: How many portions do you think you'll sell per day?
- Minimum efficient quantity: What's the smallest amount you can practically make?
💡 Example:
You're introducing a new pasta with truffle sauce:
- Shelf life: 3 days in the fridge
- Expected sales: 8 portions per day
- Minimum batch: 2 liters of sauce = 20 portions
Optimal batch: 20 portions (sold in 2.5 days)
Calculate your daily expectations
For new dishes you can estimate sales based on similar dishes. Look at:
- How popular are similar dishes on your menu?
- What price range is the new dish in?
- How many covers do you have on average per day?
After managing kitchen operations for nearly a decade, I've found that a new dish typically sells 5-15% of your total covers per day in the first weeks.
💡 Example calculation:
Restaurant with 80 covers per day:
- Conservative estimate: 5% = 4 portions/day
- Realistic estimate: 10% = 8 portions/day
- Optimistic estimate: 15% = 12 portions/day
Start with the realistic estimate: 8 portions per day.
Shelf life and food safety
The shelf life determines how many days you have to use up your batch. This depends on the ingredients:
- Fish and seafood: 1-2 days
- Meat (cooked): 2-3 days
- Vegetable dishes: 2-4 days
- Sauces (without dairy): 3-5 days
- Sauces (with cream/cheese): 2-3 days
⚠️ Watch out:
Always calculate with one day less than the maximum shelf life. Better safe than sorry.
The formula for optimal batch size
Use this formula:
Optimal batch = Expected sales per day × (Shelf life - 1 day)
The minimum is the smallest practical amount you can make without too much work.
💡 Example calculation:
New mushroom risotto:
- Expected sales: 6 portions per day
- Shelf life: 3 days (calculate with 2 days)
- Calculation: 6 × 2 = 12 portions
- Minimum batch: 8 portions (practical minimum)
Optimal batch: 12 portions
Adjust based on results
After the first week you know how the dish is performing. Adjust your batch size:
- Doing better than expected: Increase your batch by 25-50%
- Doing worse: Reduce your batch or make to order
- Lots of waste: Make smaller batches more often
Keep track of how much you throw away and how much you sell. That data helps with optimization.
Cost savings through the right batch size
Wrong batch sizing costs money in different ways:
- Too small batches: More labor time, higher cost per portion
- Too large batches: Waste, capital tied up in inventory
- No planning: Stress in the kitchen, mistakes, poor quality
💡 Cost example:
New curry with food cost €4.50 per portion:
- Batch of 20 portions: €90 ingredients
- Sell 12, throw away 8: loss €36
- Better batch of 15: loss €13.50
Savings per week: €22.50
How do you calculate the optimal batch size? (step by step)
Estimate your daily sales
Look at similar dishes on your menu. Calculate 5-15% of your total covers for a new dish. Start conservatively with 10%.
Determine the shelf life
Check how many days the dish stays good in the fridge. Subtract one day for safety. Fish 1-2 days, meat 2-3 days, vegetables 2-4 days.
Calculate your optimal batch
Multiply expected sales per day by shelf life minus 1. Check if this is practically feasible in terms of minimum quantities.
Test and adjust
After one week you look at actual sales and waste. Adjust your batch size: more if successful, less if it doesn't work out.
✨ Pro tip
Track waste percentages for your first 3 new dishes over 30 days - this creates your restaurant's baseline for future batch calculations. Most kitchens find their sweet spot reduces waste by 15-25%.
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
What if my minimum batch is larger than my expected sales?
Then you make the minimum batch and accept some waste, or you make the dish only to order. Factor the waste into your food cost calculation and menu pricing.
Should I use different batch sizes for weekdays and weekends?
Absolutely, if your sales vary significantly between days. Calculate separate batch sizes for quiet and busy periods. Many restaurants make 40% smaller batches on Mondays compared to Fridays.
Can I have batch sizes calculated automatically?
Yes, apps like KitchenNmbrs can suggest optimal batch sizes based on your sales data and shelf life. This saves calculation time and reduces human error in the planning process.
📚 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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