Planning buffet quantities for 50 people feels like a guessing game - order too little and guests leave hungry, order too much and you're throwing away expensive ingredients. Most caterers estimate portions, which leads to 20-30% waste or embarrassing shortages. Here's how to calculate precise quantities for each product.
The basic rule for buffet portioning
Buffets require different calculations than plated meals. Guests serve themselves, so you must factor in:
- Over-serving: guests often take more than they eat
- Variation in appetite: some eat a lot, others eat little
- Popularity per dish: not everything gets taken equally
- Waste from presentation: the last bit in the pan often doesn't get taken
? Example:
Buffet for 50 people - main courses:
- Chicken: 50 × 180g × 1.2 = 10.8 kg
- Fish: 50 × 150g × 1.2 = 9.0 kg
- Vegetarian: 50 × 160g × 1.2 = 9.6 kg
Total meat/fish: 29.4 kg for 50 people
Standard portion quantities per person
These quantities come from years of catering data:
Main courses (per person):
- Meat/poultry: 180-200 grams
- Fish: 150-180 grams
- Vegetarian main courses: 160-200 grams
Side dishes (per person):
- Rice/pasta: 80-100 grams (dry weight)
- Potatoes: 200-250 grams
- Vegetables: 150-200 grams
- Salad: 80-120 grams
Bread and appetizers:
- Bread: 2-3 slices per person
- Soup: 200-250 ml per person
- Snacks/nuts: 50-80 grams per person
Applying the buffet factor
For buffets, you use a buffet factor of 1.2 to 1.3. This adds 20-30% extra on top of standard portions.
⚠️ Note:
For business lunches use factor 1.2. For parties and weddings use factor 1.3 - people eat more and serve themselves more generously.
Formula:
Required quantity = Number of people × Standard portion × Buffet factor
? Example business lunch:
50 people, buffet factor 1.2:
- Rolls: 50 × 2.5 × 1.2 = 150 rolls
- Filling (ham): 50 × 40g × 1.2 = 2.4 kg
- Salad: 50 × 100g × 1.2 = 6.0 kg
- Soup: 50 × 225ml × 1.2 = 13.5 liters
Accounting for different dishes
Not every dish gets equal attention. Use this distribution:
- Popular dishes (chicken, pasta): 60-70% of guests take this
- Average dishes (fish, vegetarian): 40-50% of guests
- Specific dishes (spicy, exotic): 20-30% of guests
? Example main courses:
50 people, 3 main courses:
- Chicken (popular): 50 × 0.65 × 180g × 1.2 = 7.0 kg
- Salmon (average): 50 × 0.45 × 150g × 1.2 = 4.1 kg
- Curry (specific): 50 × 0.25 × 160g × 1.2 = 2.4 kg
Total: 13.5 kg for 50 people (instead of 29.4 kg if everyone took everything)
Calculating cost per person
After calculating quantities, work out total cost:
Formula:
Cost per person = Total purchasing costs ÷ Number of people
For catering, food cost should stay between 25-35% of your selling price excl. VAT. From tracking this across dozens of restaurants, venues that exceed 35% food cost struggle with profitability unless they're charging premium prices.
⚠️ Note:
Don't forget additional costs: packaging, transport, setup and on-site staff. These can add 20-40% on top of food cost.
Tracking digitally saves time and money
Many caterers track recipes and portions in Excel, but that gets messy fast. With a system you can:
- Save standard buffet recipes for different numbers of people
- Automatically calculate costs per person
- Generate shopping lists based on your planning
- Track what you actually used vs. what you bought
How do you calculate buffet quantities? (step by step)
Determine your standard portion quantities
Use the standard: main courses 150-200g, side dishes 80-200g per person. Adjust based on your target group - business lunch or festive dinner.
Choose your buffet factor
For business events: factor 1.2. For parties and weddings: factor 1.3. Multiply each standard portion by this factor.
Calculate popularity per dish
Popular dishes: 60-70% of guests take this. Average: 40-50%. Specific dishes: 20-30%. Multiply number of people by this percentage.
Calculate the total quantities
Formula: Number of people × Popularity % × Standard portion × Buffet factor. Add up all dishes for your total shopping list.
Check your cost per person
Divide your total purchasing costs by number of people. For catering, your food cost should be between 25-35% of your selling price excl. VAT.
✨ Pro tip
Test your portions with a 25-person practice buffet first, then scale up using the exact same ratios. Track waste percentages for 3 events to build your personal buffet database.
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Frequently asked questions
What if I haven't bought enough for my buffet?
How do I prevent a lot of leftovers after the buffet?
Should I calculate different quantities for children?
How do I calculate drinks for a buffet?
Should I adjust quantities for seasonal events?
How do dietary restrictions affect my calculations?
What's the difference between lunch and dinner buffet portions?
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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