Buffet Amount Calculator Formula

Understand the math behind the buffet amount calculator. Each variable explained with a worked example.

Use the Buffet Amount Calculator

Formulas Used

Total Entree (raw)

total_entree_lbs = round(guests * oz_per_entree * 1.3 / 16 * 1.15)

Per Entree Option

per_entree_lbs = round(guests * oz_per_entree * 1.3 / 16 * 1.15 / entree_options * 10) / 10

Total Sides (all)

total_sides_lbs = round(guests * side_options * oz_per_side / 16 * 1.15)

Per Side Dish

per_side_lbs = round(guests * oz_per_side / 16 * 1.15 * 10) / 10

Variables

VariableDescriptionDefault
guestsNumber of Guests40
entree_optionsEntree Options2
oz_per_entreeEntree Portion (cooked)(oz)6
side_optionsSide Dish Options4
oz_per_sideSide Portion(oz)3

How It Works

How to Calculate Buffet Quantities

Formula

Total Entree (raw) = Guests x Portion x 1.3 (shrinkage) x 1.15 (buffet buffer) / 16

Total Sides = Guests x Side Options x Portion per Side x 1.15 / 16

The Buffet Buffer

Buffets need 15-20% more food than plated service because:

  • Guests serve themselves and tend to take slightly larger portions
  • Trays must remain full-looking until the end of service
  • Not all dishes will be equally popular

    • Distribution Across Entrees

    With 2 entree options, expect a roughly 60/40 split. With 3 options, expect 40/30/30. Prepare each entree for at least 60% of the guest count to avoid running out of the popular option.

    Worked Example

    40 guests, 2 entrees at 6 oz, 4 sides at 3 oz each.

    guests = 40entree_options = 2oz_per_entree = 6side_options = 4oz_per_side = 3
    1. 01Total entree raw = 40 x 6 x 1.3 / 16 x 1.15 = 22.4 lbs, round to 22 lbs
    2. 02Per entree option = 22 / 2 = 11 lbs each
    3. 03Total sides = 40 x 4 x 3 / 16 x 1.15 = 34.5 lbs, round to 35 lbs
    4. 04Per side dish = 40 x 3 / 16 x 1.15 = 8.6 lbs each

    Ready to run the numbers?

    Open Buffet Amount Calculator