Adding new dishes without a plan can quickly spiral your food costs out of control. Smart chefs design dishes around shared ingredients to unlock better supplier prices and reduce waste. You can calculate exactly how much you'll save before making any menu changes.
Why shared ingredients save you money
Developing a new dish that shares ingredients with existing ones gives you three financial advantages:
- Higher purchase volumes: More kilos = better prices
- Less waste: Ingredients turn over faster
- More efficient inventory: Fewer different items in the cooler
💡 Example:
You already sell pasta carbonara and want to add pasta puttanesca. Both use pancetta:
- Carbonara: 50g pancetta per portion, 20 portions/week = 1 kg/week
- Puttanesca: 40g pancetta per portion, 15 portions/week = 0.6 kg/week
- Total: 1.6 kg/week instead of 1 kg/week
Result: You now buy 6.4 kg/month instead of 4 kg/month
Calculate your new purchase price
Suppliers typically offer discounts at higher volumes. Check your current price list for volume breaks:
- 1-5 kg: €18.00/kg
- 5-10 kg: €16.50/kg (8% discount)
- 10+ kg: €15.00/kg (17% discount)
Add up all dishes that use this ingredient to find your new monthly volume.
⚠️ Note:
Always calculate with your actual consumption, not your sales forecast. New dishes often move slower than expected - the kind of thing you only learn after closing your first month at a loss.
Formula for purchasing savings
Use this simple formula to calculate your exact savings:
Savings per kg = Old price - New price
Total monthly savings = Savings per kg × Total monthly consumption
💡 Calculation example:
Pancetta example from above:
- Old price: €18.00/kg (4 kg/month)
- New price: €16.50/kg (6.4 kg/month)
- Savings per kg: €18.00 - €16.50 = €1.50
Monthly savings: €1.50 × 6.4 kg = €9.60/month = €115/year
Calculate the impact on your food cost
The lower purchase price automatically improves your food cost for all dishes using this ingredient:
New food cost = (Total ingredient costs with new price / Selling price excl. VAT) × 100
💡 Impact on carbonara:
Carbonara for €18.50 (€16.97 excl. VAT):
- Old pancetta costs: 0.05 kg × €18.00 = €0.90
- New pancetta costs: 0.05 kg × €16.50 = €0.83
- Savings per portion: €0.07
At 20 portions/week: €0.07 × 20 × 52 = €72.80 extra profit per year
Account for additional costs
Shared ingredients sometimes bring extra costs you need to factor in:
- Higher minimum order: You may need to hold more inventory
- Shorter shelf life: If the ingredient spoils quickly, you risk waste
- Seasonal fluctuations: Prices can fluctuate at higher volumes
Subtract these costs from your calculated savings for the net benefit.
How do you calculate purchasing savings? (step by step)
Inventory current consumption
Add up how much you currently use per month of this ingredient for all existing dishes. Check your purchase invoices from the last 3 months for a realistic average.
Calculate new total consumption
Add the expected consumption of your new dish to your current monthly consumption. Be conservative in your estimate - new dishes often sell slower than expected.
Check volume discounts
Ask your supplier for prices at your new purchase volume. Many suppliers have tiered discounts that automatically apply at higher volumes.
Calculate the savings
Subtract your new price per kilo from your old price. Multiply this by your total monthly consumption for your monthly savings. Don't forget to multiply by 12 for your annual savings.
✨ Pro tip
Focus on ingredients you already use 3+ times per week that have shelf lives longer than 14 days. This combination gives you the biggest volume discounts with minimal waste risk.
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 new dish sells less than expected?
Always calculate with conservative sales figures. It's better to be pleasantly surprised than to end up with too much inventory that spoils.
Do I always get a discount at higher volumes?
Not always. Small suppliers sometimes have fixed prices. But at volumes above 5-10 kg per month, you can usually negotiate a better price.
How do I prevent waste with shared ingredients?
Plan your purchases based on your total consumption of all dishes combined. Check your inventory weekly and adjust your order based on what you actually use.
Should I pass the savings on to my menu price?
That's your choice. You can use the savings to improve your margin, or price your new dish more competitively to attract more volume.
What happens if the shared ingredient price increases?
Then the costs of all dishes using this ingredient go up. The advantage is that you only need to track and adjust one price instead of multiple.
How do I handle seasonal price fluctuations with shared ingredients?
Track price changes over 6-month periods to identify patterns. Build a 10-15% buffer into your food cost calculations for volatile ingredients like fresh produce.
Can I negotiate better prices if I commit to higher volumes long-term?
Most suppliers offer contract pricing for guaranteed monthly volumes. You'll typically get 5-10% better rates but you're locked into minimum orders regardless of actual sales.
📚 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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