With sandwiches, every ingredient counts toward your food cost. Many lunch shops forget the small things like lettuce, tomato and sauces, which eats into their margin. Here's exactly how to calculate every ingredient precisely in your sandwich calculation.
Inventory all ingredients
Start by making a complete list of every ingredient that goes on your sandwich. Don't forget the small things that many business owners overlook.
- Main toppings: cold cuts, cheese, fish
- Vegetables: lettuce, tomato, cucumber, onion
- Sauces: mayonnaise, mustard, pesto
- Garnish: pickles, olives, herbs
- Bread itself: roll, ciabatta, multigrain bread
⚠️ Note:
A teaspoon of mayonnaise might cost only €0.08, but with 200 sandwiches per day that's €16 per day or €4,160 per year. The small amounts add up.
Determine exact portions per serving
Measure or weigh everything you put on a standard sandwich. Use a kitchen scale for accuracy.
💡 Example: Healthy sandwich
Standard portion per sandwich:
- Whole wheat roll: 80 grams
- Young cheese: 40 grams
- Ham: 30 grams
- Lettuce: 15 grams
- Tomato: 25 grams
- Cucumber: 20 grams
- Mayonnaise: 8 grams (1 teaspoon)
Have your staff weigh what they normally put on a sandwich a few times. Often there's more variation in portions than you'd think.
Convert purchase prices to price per gram
Convert all purchase prices to price per gram or per milliliter. This way you can calculate exactly what each portion costs.
💡 Example: Calculate price per gram
Young cheese purchase: €8.40 per kilo
- Price per gram: €8.40 ÷ 1000 = €0.0084 per gram
- 40 grams cheese: 40 × €0.0084 = €0.34 per sandwich
Mayonnaise: €3.20 per jar of 650ml
- Price per ml: €3.20 ÷ 650 = €0.0049 per ml
- 8ml mayonnaise: 8 × €0.0049 = €0.04 per sandwich
Account for cutting loss and waste
With fresh vegetables you always have loss from peels, bad spots and leftovers. Factor this into your food cost. From analyzing actual purchasing data across different restaurant types, vegetable waste consistently impacts margins more than owners realize.
- Tomatoes: 10-15% loss (stem, bad spots)
- Lettuce: 15-20% loss (outer leaves, thick ribs)
- Cucumber: 5-10% loss (ends)
- Onion: 8-12% loss (skin, outer layer)
💡 Example: Calculate loss
Tomatoes: €2.80 per kilo, 15% loss
- Actual price: €2.80 ÷ 0.85 = €3.29 per kilo usable
- Price per gram: €3.29 ÷ 1000 = €0.00329
- 25 grams tomato: 25 × €0.00329 = €0.08 per sandwich
Add up complete food cost
Add all ingredient costs together for your total food cost per sandwich. Don't forget to include the bread itself.
💡 Example: Total food cost healthy sandwich
- Whole wheat roll: €0.28
- Young cheese (40g): €0.34
- Ham (30g): €0.42
- Lettuce (15g): €0.06
- Tomato (25g): €0.08
- Cucumber (20g): €0.04
- Mayonnaise (8g): €0.04
Total food cost: €1.26
At selling price €5.50 (excl. 9% VAT = €5.05): food cost = 25%
Calculate variations and options
Also calculate the costs of extras and variations that customers can order.
- Extra cheese: +20 grams = +€0.17
- Avocado: 1/4 avocado = approximately €0.35
- Bacon: 2 slices = approximately €0.28
- Pesto instead of mayo: difference of €0.06
This way you know exactly how much to charge for extras and your margin stays intact.
⚠️ Note:
Update your food costs every month. Vegetable prices fluctuate significantly and your supplier regularly adjusts their prices. What cost €1.26 last month might now be €1.45.
How do you calculate sandwich costs? (step by step)
Make an ingredients list
Write down all ingredients that go on your sandwich, including bread, toppings, vegetables, sauces and garnish. Don't forget anything, not even the smallest bits of herbs or sauces.
Weigh all portions
Measure or weigh exactly how much of each ingredient you use per sandwich. Use a kitchen scale for accuracy and have different staff members do this to get averages.
Convert purchase prices to price per gram
Divide all purchase prices by the number of grams or milliliters to get the price per unit. For vegetables, factor in cutting loss by dividing the purchase price by the yield percentage.
Calculate food cost per ingredient
Multiply the price per gram by the number of grams you use. Add all ingredient costs together for your total food cost per sandwich.
Check your food cost percentage
Divide your total ingredient costs by your selling price excluding VAT and multiply by 100. For sandwiches, 20-30% food cost is standard.
✨ Pro tip
Weigh your standard portions every 2 weeks and document any variations. Staff often add 15-20% more ingredients over time, which can push your food cost from 25% to 30% without you noticing.
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 do I factor in cutting loss for vegetables?
Divide your purchase price by the yield percentage. With 15% loss you have 85% yield, so divide €2.80 per kilo by 0.85 = €3.29 actual price per kilo. This ensures you're accounting for the full cost of unusable portions.
What is a normal food cost for sandwiches?
For lunch shops, 20-30% food cost is standard. Simple sandwiches can be under 25%, more luxurious sandwiches with expensive ingredients are around 30%.
Do I need to include packaging costs?
For takeout and delivery, yes. A sandwich wrapper costs approximately €0.15-0.25 and counts toward your food cost, just like napkins and bags.
How do I calculate the cost of sauces per portion?
Measure how much you use (for example 1 teaspoon = 8ml) and convert the jar price to price per ml. A jar of mayo for €3.20 for 650ml = €0.0049 per ml. Then multiply by your portion size to get the exact cost per sandwich.
📚 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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