Managing restaurant margins is like steering a ship - small course corrections weekly prevent you from drifting miles off course by month's end. Your food costs shift constantly due to supplier changes, portion adjustments, and staff decisions. Dedicating just 30 minutes each week to review what worked and what didn't keeps your profitability on track.
Why weekly reviews are crucial
Your margin gets hit by countless micro-decisions each week. A different supplier here, a recipe tweak there, extra waste during rush periods, or kitchen staff getting heavy-handed with portions. Wait until month-end to spot these issues? You've already bled money for weeks.
? Example:
Restaurant De Smulhoek does €8.000 per week. Their food cost quietly rises from 30% to 35%:
- Week 1: 30% food cost = €2.400 in ingredients
- Week 4: 35% food cost = €2.800 in ingredients
- Difference: €400 per week
Monthly loss: €1.600
Which actions you should track
Focus on moves that directly impact your bottom line. Don't analyze everything, but definitely monitor these:
- Recipe modifications: New supplier, portion adjustments, ingredient substitutions
- Menu pricing: Price increases or promotional discounts
- Vendor changes: Switching to cheaper or premium suppliers
- Kitchen staff shifts: New cooks, different portioning habits
- Seasonal swaps: Moving to costlier or budget-friendly seasonal alternatives
⚠️ Note:
Track only deliberate changes you've made. External forces like inflation or supplier price hikes matter, but aren't actionable 'moves' you can review and improve.
Setting up the weekly review
An effective review takes 30 minutes max and delivers instant clarity. You're comparing one thing: how did your actions affect your margin?
Step 1: Gather your basic data
You need three numbers:
- This week's revenue (excl. VAT)
- Total purchasing costs this week
- This week's food cost percentage: (Purchasing / Revenue excl. VAT) × 100
Step 2: Compare with last week
Calculate the food cost percentage difference and figure out what this costs or saves you.
? Example calculation:
Revenue this week: €7.500 excl. VAT
- Last week: 32% food cost
- This week: 29% food cost
- Difference: -3 percentage points (improvement!)
Impact: 3% of €7.500 = €225 extra margin this week
Step 3: Link to concrete actions
Here's where the magic happens: which specific action caused this shift?
- Positive impact: Cheaper supplier, tighter portions, smarter prep techniques
- Negative impact: Premium ingredients, excessive waste, generous portions
- No obvious cause: Dig deeper - you might've missed something
From years of working in professional kitchens, I've seen how small portion creep - just an extra ounce of protein per plate - can silently destroy margins over weeks.
Creating a concrete action plan
Reviews without follow-up are worthless. Make specific commitments immediately:
? Example action plan:
Problem: Food cost jumped from 30% to 33% because new chef portions generously.
- Action: Install portion scales and standardized spoons in kitchen
- Who: Sous chef trains new chef
- When: Tomorrow before service starts
- Check: Food cost returns to 30% next week
Expanding successful actions
If something worked brilliantly, scale it up:
- Cheaper meat supplier delivered quality: Test their fish and vegetables too
- Better planning reduced waste: Apply same planning method to other shifts
- Menu price increase went unnoticed: Test on additional dishes
Digital tools for your review
Manual tracking works, but systems like KitchenNmbrs automatically calculate weekly food costs. You'll spot which dishes are off-track and identify causes faster.
⚠️ Note:
Tools provide numbers, but you do the detective work. Always identify what changed from last week before jumping to conclusions.
Common mistakes in weekly reviews
Mistake 1: Only examining total food cost
Your overall food cost might look stable while individual dishes swing wildly. Check your 5 highest-volume dishes separately too.
Mistake 2: Ignoring seasonal factors
Asparagus costs triple in March compared to May. Factor seasonality into your analysis, or you'll blame failed actions on natural price fluctuations.
Mistake 3: Testing too many changes simultaneously
Switch three suppliers at once and your food cost drops? You can't tell which change delivered the biggest bang. Test one variable at a time whenever possible.
Related articles
How do you do a weekly margin review? (step by step)
Gather your weekly figures
Note your revenue excl. VAT, total purchasing costs and calculate your food cost percentage for this week. Compare this with last week to see the difference.
Identify all actions from this week
Make a list of deliberate changes: new suppliers, recipe adjustments, price changes, or other kitchen changes that could impact your margin.
Link figures to actions
Match each significant change in food cost to a concrete action. Calculate the financial impact per action and determine which actions you want to repeat, expand or stop.
✨ Pro tip
Every Monday at 9 AM, spend exactly 15 minutes calculating last week's food cost percentage and comparing it to your 4-week average. Write one sentence about what changed - after 8 weeks, you'll spot profit-killing patterns before they devastate your bottom line.
Calculate this yourself?
In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.
Calculate it yourself?
Our free food cost calculator does it in seconds.
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Frequently asked questions
How often should I review my margin?
What if my food cost varies weekly without obvious reasons?
What food cost deviation triggers immediate action?
Can I do this review without a POS system?
What if I changed multiple things simultaneously?
How long should I wait before judging an action's success?
Should I factor in labor costs during these margin reviews?
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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