A downtown bistro discovered their weekend pasta generated 7% more margin than the identical weekday version - same ingredients, different pricing strategy. Most restaurants use one blanket margin calculation, missing crucial profit insights. Split calculations reveal which periods actually drive your bottom line.
Why calculate different margins?
Your weekend menu typically commands higher prices, but also sees increased covers and potentially pricier ingredients. Weekday menus stay competitively priced to draw guests during slower periods with reduced occupancy. Without separate calculations, you're flying blind on which timeframe actually generates superior returns.
? Example: Bistro with dual menu
Weekday lunch: Pasta €14.50, ingredients €4.20
Weekend dinner: Pasta €18.50, same ingredients €4.20
- Weekday food cost: 31.6% (€4.20 / €13.30 excl. VAT)
- Weekend food cost: 24.7% (€4.20 / €16.97 excl. VAT)
Weekend delivers 7 percentage points more margin on the same dish.
Step 1: Split your sales data
Extract revenue and dish quantities per timeframe from your POS system. Modern systems can automatically segment data by weekday/weekend or lunch/dinner periods.
- Weekday revenue per dish
- Weekend revenue per dish
- Number sold per period
- Average check per period
Step 2: Calculate food cost per period
Apply identical ingredient costs against different menu prices from each period. Always exclude VAT from your calculations to maintain accuracy.
? Example calculation:
Steak ingredients: €11.50
- Weekday menu: €28.00 incl. VAT → €25.69 excl. VAT
- Weekend menu: €34.00 incl. VAT → €31.19 excl. VAT
Weekday food cost: (€11.50 / €25.69) × 100 = 44.8%
Weekend food cost: (€11.50 / €31.19) × 100 = 36.9%
Step 3: Weight the total margin
Tally quantities sold per period for each dish. Multiply by individual margins. This reveals which timeframe contributes most substantially to overall profitability - a pattern we see repeatedly in restaurant financials where volume doesn't always equal profit.
⚠️ Note:
Focus on absolute amounts, not just percentages. A 30% food cost on €35 generates superior returns compared to 25% food cost on €20.
Mix of dishes per period
You'll typically sell different items weekdays versus weekends. Light midday fare during the week, elaborate dinner selections on weekends. This shift dramatically affects average margins.
- Weekday: more salads, soups, light pastas
- Weekend: more meat, fish, elaborate appetizers
- Different beverage mix (more wine on weekends)
Factor in seasonality
Ingredient costs fluctuate seasonally. Your asparagus costs less in May than March. Calculate margins quarterly rather than just weekly/weekend splits for accurate tracking.
? Practical example:
Restaurant with 120 covers/week:
- Weekdays (Mon-Thu): 40 covers, €22 average check
- Weekend (Fri-Sun): 80 covers, €31 average check
- Weekday revenue: €880, food cost 34% = €299 ingredient costs
- Weekend revenue: €2,480, food cost 28% = €694 ingredient costs
Weekend delivers 65% more margin with double occupancy.
Dynamic pricing strategy
Armed with these numbers, you can make strategic adjustments. Gradually raise weekday prices or create weekend specials with exceptional margins to maximize profitability.
How do you calculate margin per menu? (step by step)
Pull sales data from your POS system
Split your revenue and number of dishes sold per time period (weekday/weekend or lunch/dinner). Also note the number of covers per period for a complete picture.
Calculate food cost per menu
Use the same ingredient costs but the different selling prices. Formula: (ingredient costs / selling price excl. VAT) × 100. Always calculate excl. 9% VAT.
Weight the total impact per period
Multiply the number of dishes sold per period by the margin per item. Add up for all dishes to see which period generates the most absolute profit.
✨ Pro tip
Track your weekend versus weekday beverage margins within 72 hours of implementing split calculations. Weekend guests typically consume 40% more wine, which can boost total cover profitability by 12-15% even with identical food margins.
Calculate this yourself?
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Frequently asked questions
Do I need to do a separate calculation for each dish?
What if I use the same prices but different portions?
How often should I recalculate this?
What if my weekend is much busier but has lower margin?
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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