Prime cost ratio caught me completely off guard during my first restaurant venture. I thought tracking food costs alone would keep me profitable, but I was bleeding money through labor inefficiencies. Prime cost — combining both food and labor expenses — shows you the real health of your operation, and anything above 65% typically leaves you scrambling to cover rent and utilities.
What exactly is prime cost ratio?
Prime cost ratio merges your two largest expenses: ingredient costs and labor expenses. It reveals if you've got sufficient margin remaining for overhead like rent, utilities, equipment depreciation, and profit.
? Example:
Restaurant with €50,000 monthly revenue:
- Food cost: €16,000 (32%)
- Labor costs: €15,000 (30%)
- Prime cost: €31,000
Prime cost ratio: 62%
The formula for prime cost ratio
The math's straightforward but reveals everything:
Prime cost ratio = ((Food cost + Labor cost) / Revenue) × 100
Calculate all figures excluding VAT. Food cost includes every ingredient purchase. Labor cost encompasses wages, employer contributions, holiday pay — the complete personnel expense.
⚠️ Note:
Always calculate with revenue excluding VAT. Otherwise your prime cost will look lower than it actually is.
What are healthy prime cost percentages?
Your target depends on your restaurant type:
- Fine dining: 55-65% (premium ingredients, extensive staff)
- Casual dining: 60-65% (quality-efficiency balance)
- Fast casual: 50-60% (streamlined ingredients, minimal staff)
- Delivery/takeaway: 45-55% (no table service, packaging costs)
Exceeding 65% makes profitability nearly impossible. Under 50% suggests exceptional efficiency, but verify you're not compromising quality or service.
? Example calculation:
Bistro with €80,000 monthly revenue excl. VAT:
- Ingredients: €24,000
- Labor costs: €26,000
- Prime cost total: €50,000
Prime cost ratio: (€50,000 / €80,000) × 100 = 62.5%
Why prime cost beats food cost tracking alone
Most operators obsess over food costs but ignore the bigger picture. Low ingredient costs mean nothing if you're overstaffed. Conversely, premium ingredients can work if your labor runs efficiently.
Prime cost reveals the true relationship between both expenses. It guides critical decisions:
- Add staff for improved service quality?
- Upgrade ingredients to justify higher menu prices?
- Implement technology to reduce labor dependency?
Managing with prime cost data
Prime cost functions as your profitability throttle. Running too high? You've got three options:
- Boost revenue: Increase covers, raise prices strategically
- Cut food costs: Negotiate better purchasing, eliminate waste
- Streamline labor: Optimize scheduling, improve workflows
This is the kind of thing you only learn after closing your first month at a loss — small prime cost improvements compound into massive profit differences.
? Practical example:
Lowering prime cost from 68% to 62%:
- At €60,000 monthly revenue = €3,600/month savings
- Annually: €43,200 extra profit
That's the difference between loss and healthy profit.
Tracking prime cost operationally
Monitor your prime cost monthly minimum, weekly ideally. Ask yourself:
- Does my ratio fall within industry benchmarks?
- What trends am I seeing over time?
- Which component — food or labor — drives variations?
- Can I optimize either without sacrificing standards?
Food cost calculators automatically track ingredient expenses per dish. Pair that data with labor costs and you'll spot prime cost shifts immediately.
How do you calculate prime cost ratio? (step by step)
Gather your food cost data
Add up all ingredient costs from the past month. These are your supplier invoices, excluding VAT. Don't forget small expenses like spices, oil, and garnishes.
Calculate your total labor costs
Add up all labor costs: gross wages, employer contributions, holiday pay, sick pay, and any temporary staff. This is your labor cost for that month.
Divide by your revenue and multiply by 100
Prime cost ratio = ((Food cost + Labor cost) / Revenue excl. VAT) × 100. The result is your prime cost percentage for that period.
✨ Pro tip
Calculate your prime cost every Tuesday using the previous week's data. A 2% variance sustained over 3 weeks signals you need immediate action — that small drift separates profitable months from devastating losses.
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's a realistic prime cost target for casual dining restaurants?
Should I include management salaries in labor cost calculations?
How do seasonal menu changes affect prime cost ratios?
Can prime cost vary significantly between lunch and dinner services?
What if my prime cost is too high?
How quickly should I react to prime cost spikes?
Do delivery commission fees count toward prime cost?
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
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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