67% of restaurant failures stem from poor cost control, with prime cost being the biggest culprit. Most owners obsess over food costs but ignore labor expenses, which can be equally devastating. Weekly prime cost tracking reveals overstaffing patterns before they kill your margins.
What is prime cost and why measure weekly?
Prime cost combines your two largest expenses: ingredient costs and labor expenses (wages plus benefits). Most successful restaurants keep this between 55-65% of total revenue.
💡 Example:
Restaurant with €15,000 weekly revenue:
- Food cost: €4,500 (30%)
- Labor costs: €3,750 (25%)
- Prime cost: €8,250 (55%)
This is a healthy ratio.
Weekly tracking lets you course-correct quickly. Monthly reviews? You've already burned cash for four weeks straight.
Adjusting staffing levels based on prime cost
Prime costs above 65% usually signal overstaffing, not ingredient problems. Food costs stay relatively consistent, but labor can swing wildly week to week.
⚠️ Note:
Always calculate labor costs including social contributions. That's roughly 25-30% on top of gross wages.
Actions you can take immediately:
- Scale staff with revenue drops: Revenue down 20%? Cut one person from the floor
- Implement flexible scheduling: Send staff home early during slow periods
- Cross-train for efficiency: One person handles both register and service during quiet shifts
- Optimize prep timing: Do prep during downtime, not with dedicated staff
Signals in your prime cost overview
From analyzing actual purchasing data across different restaurant types, certain patterns emerge consistently:
💡 Example signals:
- Monday always high prime cost → overstaffed for slow day
- Prime cost creeps up weekly → wages outpacing revenue growth
- Wild week-to-week swings → chaotic scheduling
Warning signs that demand action:
- Prime cost exceeds 70% → emergency mode activated
- Labor costs hit 35% of revenue → major overstaffing
- Food costs rising, labor flat → supplier price increases
Practical tools for weekly tracking
You need three data points: revenue, food costs, and labor expenses. Here's where to find them:
- Revenue: Daily POS reports (track religiously)
- Food costs: Purchase receipts plus inventory shifts
- Labor costs: Scheduled hours × wages × 1.3 (covers benefits)
💡 Quick calculation:
Estimate weekly labor costs:
- Add up all hours worked
- Multiply by average hourly rate
- Multiply by 1.3 for social contributions
40 hours × €15 × 1.3 = €780 labor costs
Automated systems can crunch these numbers and show prime cost trends over time.
How do you create a weekly prime cost overview?
Gather your weekly figures
Note your revenue from Monday through Sunday from your POS system. Add up all purchases from that week. Calculate how many hours staff worked and what that cost including social contributions.
Calculate your percentages
Divide food cost by revenue for food cost %. Divide labor costs by revenue for labor %. Add both together for prime cost %. Always use revenue excluding VAT for accurate percentages.
Compare with previous weeks
Put your figures next to the previous 4 weeks. Look for trends: is prime cost rising? Which part (food or labor) is causing the increase? If prime cost is above 65%, you need to take action.
✨ Pro tip
Run your prime cost analysis every Tuesday morning for the previous 7 days. This gives you 48 hours to adjust next week's schedule before finalizing rosters.
Calculate this yourself?
In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.
Was this article helpful?
Frequently asked questions
What is a healthy prime cost for restaurants?
Between 55-65% of revenue works for most operations. Food costs typically run 28-35%, labor 25-30%. Anything above 70% usually means you're bleeding money.
How often should I adjust staffing levels?
Plan weekly schedules, but adjust daily based on actual traffic. If it's dead by 8 PM, send someone home early. Don't wait until week's end to react.
Can I calculate prime cost without fancy accounting?
Absolutely. You just need revenue from your register, purchase receipts, and hours worked. Multiply labor by 1.3 for benefits and you're set.
What if food cost is fine but prime cost is high?
Your staffing is the problem. You've got too many people for your revenue level. Review your daily schedules and cut where possible.
📚 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.
All your financial KPIs in one dashboard
Food cost percentage, gross margin, revenue per cover — KitchenNmbrs calculates it all automatically based on your recipes and purchases. Start your free trial.
Start free trial →