Picture this: you're running a restaurant seven days a week, but Tuesday nights barely cover your costs. Some service days drain more money than they bring in, yet many operators keep their doors open out of habit. The math behind closing these loss-makers reveals exactly how much you could save.
What is a loss-making service day?
Any day where operational costs exceed your gross profit. Monday or Tuesday evenings are common culprits — you're paying full staff wages and utilities while serving maybe a dozen customers.
💡 Example:
Monday evening in your restaurant:
- Revenue: €450
- Food cost (30%): €135
- Staff (2 FTE × €120): €240
- Energy and other costs: €90
Gross profit: €450 - €135 = €315
Operational costs: €330 → Loss: €15
Step 1: Calculate your current costs per service day
List every expense that vanishes if you close that day:
- Staff costs: All scheduled hours × hourly rate (plus payroll taxes)
- Food cost: Usually 30-35% of that day's revenue
- Utilities: Gas, electricity, water usage for service
- Variable expenses: Cleaning supplies, dishwashing, consumables
Step 2: Calculate your gross profit for that day
Take your daily revenue and subtract only the food costs. That's your gross profit before covering everything else.
Gross profit = Revenue - Food cost
⚠️ Note:
Skip rent and equipment depreciation — you'll pay those regardless of being open or closed. Focus purely on avoidable costs.
Step 3: Calculate the net effect
One of the most common blind spots in kitchen management is forgetting that closing means losing revenue too. The real impact equals your cost savings minus the gross profit you're giving up.
💡 Calculation:
Closing Monday evening saves per week:
- Staff: €240
- Energy: €90
- Other costs: €25
- Foregone gross profit: -€315
Net savings per week: €40
Per year: €40 × 52 = €2,080
Factors to consider
Your calculation needs to account for these ripple effects:
- Customer retention: Will regulars switch to competitors if you're unavailable one day?
- Staff flexibility: Can you actually reduce hours, or are contracts fixed?
- Supplier relationships: Might reduced ordering volume hurt your purchasing terms?
- Fixed expenses: Rent, insurance, and loan payments continue regardless
Alternative calculation: break-even point
Rather than closing, you could determine the minimum revenue needed to stop losing money on that day.
Break-even revenue = Operational costs / (1 - Food cost %)
💡 Break-even example:
Operational costs Monday evening: €330
Food cost: 30%
Break-even: €330 / 0.70 = €471
You need at least €471 in revenue to break even.
How do you calculate the margin impact? (step by step)
Analyze your weakest day
Look at your cash register data from the last 3 months. Which day consistently has the lowest revenue and worst result? Add up all operational costs for that day.
Calculate gross profit vs costs
Subtract only the food cost from revenue to get your gross profit. Compare this with your total operational costs (staff, energy, other). Is the gross profit lower than the costs?
Calculate annual savings
Multiply the weekly difference by 52 weeks. Subtract any negative effects like customer loss on other days or fixed staff costs that continue.
✨ Pro tip
Track your slowest service day for exactly 6 weeks before making the closure call. Document both the direct losses and any spillover effects on your busier days' performance.
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
Should I include my rent in the calculation?
No, rent and other fixed costs continue regardless of being open or closed. Only count expenses that truly disappear: staff wages, utilities, food costs, and variable supplies.
What if I have staff on fixed contracts?
Then those labor costs won't vanish by closing, making your savings much smaller. You'd need to reassign those employees to other tasks or days to capture any benefit.
How do I know if customers will leave due to fewer opening hours?
Run a one-month test closure and track if revenue drops on your remaining open days. Real customer behavior data beats guesswork every time.
What's a typical loss per bad service day?
Most struggling service days lose €50-200 per shift, though this varies wildly by location and concept. Annually, that can mean €2,500-10,000 in preventable losses.
📚 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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