Menu revisions hit your prime cost within 30 days of implementation. Prime cost combines your food expenses and labor costs - typically running 55-65% of total revenue. Smart menu adjustments can slash these costs and boost profit margins significantly.
What is prime cost and why is it important?
Prime cost combines two major expenses: ingredient costs and staff wages. Most restaurants see this figure land between 55-65% of revenue. Cross the 65% threshold? You're likely bleeding money.
💡 Example prime cost calculation:
Restaurant with €50,000 monthly revenue:
- Food cost: €16,000 (32%)
- Labor cost: €15,000 (30%)
- Prime cost: €31,000 (62%)
This is a healthy ratio.
Gather your current figures
Accurate impact analysis requires three key metrics for each dish under review:
- Current ingredient cost per serving - every component tallied
- Current menu price (excluding VAT)
- Monthly sales volume for this specific item
Don't forget prep time per dish. Complex preparations drain labor budgets faster.
Calculate the impact per dish
For each menu adjustment, measure the margin shift:
💡 Example impact calculation:
Steak adjusted from €32 to €28:
- Old margin: €32 - €12 ingredients = €20
- New margin: €28 - €10 ingredients = €18
- Difference per portion: -€2
- Sales: 80 per month
Impact: -€160 per month
Sum all positive and negative changes. This reveals your total margin impact. Most kitchen managers discover too late that small per-dish changes create massive monthly swings.
Estimate the impact on labor cost
Menu shifts ripple through labor expenses:
- Streamlined dishes = reduced prep time = trimmed labor costs
- Smaller menu selection = kitchen efficiency gains = labor savings
- Standardized recipes = fewer errors = waste reduction
⚠️ Note:
Labor costs resist precise measurement compared to ingredient tracking. Calculate conservatively and prioritize food cost analysis first.
Calculate what this means for your prime cost percentage
Now determine how your prime cost percentage shifts:
💡 Example prime cost impact:
Restaurant with €50,000 monthly revenue:
- Current prime cost: €31,000 (62%)
- Savings from menu: €2,000/month
- New prime cost: €29,000 (58%)
Improvement: 4 percentage points = €24,000 extra profit per year
Account for volume effects
Menu changes can shift revenue patterns. Higher prices might discourage customers. Lower prices could boost traffic.
- Model three scenarios: -10%, unchanged, +10% customer volume
- Verify your kitchen's capacity for increased orders
- Identify break-even points for pricing adjustments
Food cost calculators can automate these projections and test multiple scenarios simultaneously.
How do you calculate the impact of a menu revision? (step by step)
Gather your current data
Note for each dish: food cost per portion, selling price excl. VAT, and number of sales per month. Also check your total monthly revenue and current prime cost percentage.
Calculate the new margins
For each adjusted dish: calculate new food cost, new selling price, and the difference in margin per portion. Multiply this by number of sales for monthly impact.
Add up the total impact
Sum all positive and negative impacts per dish. Divide this by your monthly revenue for the effect on your prime cost percentage. Calculate what this means per year.
✨ Pro tip
Focus your 72-hour analysis window on the top 8 revenue-generating dishes. These items drive 75% of your prime cost impact and deliver the fastest ROI.
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
How often should I revise my menu for optimal prime cost?
Review your numbers quarterly at minimum. Major supplier price jumps exceeding 10% warrant immediate menu adjustments to protect margins.
What if my new menu becomes less popular with guests?
Always model volume scenarios ranging from -10% to +10%. Track revenue closely during the first month post-launch and pivot quickly to balance profitability with customer satisfaction.
Should I include labor cost in the impact calculation?
Absolutely, but tackle food costs first since they're simpler to track. Labor cost shifts mainly occur with significant prep time changes or menu complexity overhauls.
What is a realistic improvement in prime cost through menu revision?
Effective revisions typically yield 2-5 percentage point improvements. A restaurant generating €500,000 annually can expect roughly €15,000 in additional profit from a 3-point reduction.
⚠️ EU Regulation 1169/2011 — Allergen Information — https://eur-lex.europa.eu/eli/reg/2011/1169/oj
The allergen information on this page is based on EU Regulation 1169/2011. Recipes and ingredients may vary by supplier. Always verify current allergen information with your supplier and communicate this correctly to your guests. KitchenNmbrs is not liable for allergic reactions.
In the UK, the FSA enforces allergen regulations under the Food Information Regulations 2014.
📚 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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