How Much Thanksgiving Food for 20 People? Quantities for Turkey, Sides and Pie
You are hosting twenty, the recipes all say “serves 6 to 8”, and the store does not sell turkeys in the quantity “a bit more than last year”.
Here is the plain answer, then the method behind it so you can adjust it for your own crowd.
First, Count Adult-Equivalents, Not Heads
Kids eat less than adults, so 20 guests is not 20 portions. Set a kid weighting (half an adult is a common choice, and you set your own), then calculate:
Adult-equivalents = adults + (kids × weighting)
For 20 guests made up of 15 adults and 5 kids: 15 + (5 × 0.5) = 17.5 adult-equivalents.
All the food quantities below are based on 17.5. Use your own number.
The Quantity Table for 20 Guests
These are common planning ranges and rules of thumb, not laws. Appetites, menus and how many dishes you serve all shift them. If you serve many sides, individual portions shrink.
| Item | Rule of thumb (per adult-equivalent) | For 17.5 | Buy |
|---|---|---|---|
| Whole turkey, bone-in | 1 to 1.5 lb (1.25 mid) | 17.5 to 26 lb (22 mid) | one 22 lb bird (or two smaller) |
| Mashed potatoes (raw) | about 0.4 lb | 7 lb | 8 lb bag |
| Sweet potatoes | about 1/3 lb | 5.8 lb | 6 lb |
| Green beans (fresh) | about 1/4 lb | 4.4 lb | 4.5 to 5 lb |
| Stuffing, cooked | about 3/4 cup | 13 cups | two 9×13 pans |
| Gravy | about 1/3 cup | 5.8 cups | 6 cups (1.5 quarts) |
| Cranberry sauce | 2 to 3 tbsp | 2.2 to 3.3 cups | about 3 cups |
| Dinner rolls | 2 per adult, 1 per child | 35 | 3 dozen |
| Pie | about 1.25 slices per guest | 25 slices (20 guests) | 4 pies (8 slices each) |
Two notes on the rounding. First, always round up to something you can buy: an 8 lb bag, not 7 lb. Second, a spread of sides means less of each. If you serve six sides, people take a small spoonful of each; if you serve three, they take more.
Turkey: The Number Everyone Gets Anxious About
For a bone-in whole bird, 1 to 1.5 lb per person is the range most guides use. The low end assumes lots of sides and no interest in leftovers; the high end assumes leftovers are part of the plan. The midpoint is 1.25 lb, so 17.5 adult-equivalents × 1.25 = 21.9 lb, so a 22 lb turkey.
Three adjustments:
- Serving a ham too? Buy less turkey. Two proteins let you drop to about 1 lb per person, so about 17.5 lb.
- Want big leftovers? Move to 1.5 lb: about 26 lb, which is very large for a home oven, so consider two birds.
- Two birds versus one. Two smaller turkeys (say 12 and 10 lb) cook faster and more evenly, but they take up most of a standard oven. Only do it if you can spare the rack space, or use a roaster oven for one.
Thaw time. For a frozen bird, plan roughly 24 hours in the refrigerator per 4 to 5 lb, which is USDA food-safety guidance. A 22 lb turkey needs 22 ÷ 5 = 4.4 to 22 ÷ 4 = 5.5 days. Start five to six days before the dinner, and put a tray under it.
The Scaling Formula for Recipes Written for 6 to 8
Recipes state servings; you need twenty. The formula:
Scaled quantity = recipe quantity × (guests ÷ recipe serves), rounded up to a purchasable size.
Worked example. A mashed potato recipe serves 8 and uses 3 lb of potatoes.
- For 20 guests: 3 × (20 ÷ 8) = 7.5 lb, so buy an 8 lb bag.
- Using adult-equivalents: 3 × (17.5 ÷ 8) = 6.56 lb, so buy a 7 lb bag.
Both work. The second is more precise; the first is safer if you like leftovers. Run every line of your shopping list through the same formula, keep the recipe serves and the quantity in separate columns, and let the sheet do the arithmetic.
What Does Not Scale in a Straight Line
Multiplying quantities by 2.5 works for the bulk of the recipe and fails on some details:
- Salt, spices and herbs. Start at about 75 percent of the scaled amount, taste, and add. It is easier to add than to fix.
- Leavening (baking powder, yeast). Do not simply multiply, especially for large batches.
- Pan size and cook time. A double batch in one deep pan cooks slower than two shallow pans. Use two pans and keep the recipe’s time as your starting point.
- Liquids in a big pot. Evaporation does not scale, so you may need less liquid than the math suggests.
Leftovers and Food Safety
Perishable leftovers should go into the refrigerator within two hours of coming off the heat (USDA food-safety guidance). Have containers ready before dinner, and count them: a shopping list that scales dishes but forgets 20 takeaway containers is a classic miss.
The Shortcut: Let a Sheet Do It
Building the scaled shopping list yourself takes an evening. Each line needs recipe quantity, recipe serves, a scaled quantity and a unit price. If you would rather not:
The Shopping List tab in the Thanksgiving & Holiday Hosting Planner rescales your recipe quantities to the guests who actually said Yes, works out the size of bird you need, and groups items by store section so you shop once. Enter the quantity as written, and the Scaled Qty column handles every line.
For the rest of the plan, which covers budget, guest list, potluck and the oven timeline, start with the complete Thanksgiving dinner planner guide, and check what those quantities cost per person.
Featured on ReadySheetGo
Thanksgiving & Holiday Hosting Planner Spreadsheet — $14.99
A Shopping List that rescales every recipe quantity to your confirmed headcount, grouped by store section with unit prices, so the size of turkey and every bag of potatoes is calculated for you. Plus a Cost Per Head tab, Guest List with RSVP counting, Menu Builder, Cooking Timeline with oven-clash flags, Seating Plan and Post-Event Notes.
11 tabs, 1,531 live formulas, and a full sample Thanksgiving for 23 guests already loaded. Works in Excel and Google Sheets. No macros, no add-ons.
Get the Thanksgiving Hosting Planner →
Frequently Asked Questions
How much turkey do you need per person for Thanksgiving?
A common planning range for a whole bone-in turkey is 1 to 1.5 pounds per person, with about 1.25 pounds a good middle figure if you want some leftovers. For 20 guests made up of 15 adults and 5 kids (17.5 adult-equivalents), that is roughly 22 pounds. If you are also serving a ham, you can buy less. Treat it as a guide, not a rule.
How do you scale a recipe written for 8 up to 20 servings?
Multiply each ingredient by guests divided by recipe servings, then round up to a size you can actually buy. A recipe for 8 that uses 3 pounds of potatoes needs 3 × (20 ÷ 8) = 7.5 pounds for 20, so buy 8. Salt, spices and leavening do not always scale in a straight line, so start around three quarters of the scaled amount and taste.
How many rolls and pies do you need for 20 people?
For rolls, planning on two per adult and one per child gives 35 for 15 adults and 5 kids, so buy or bake three dozen. For pie, about 1.25 slices per guest is a reasonable plan when there are two or more kinds, which is 25 slices, or four 8-slice pies with a little to spare.
Is it better to cook one big turkey or two smaller ones?
Two smaller turkeys (say 12 and 10 pounds) usually cook faster and more evenly than one 22-pound bird, and they give you more dark meat. The cost is oven space: two roasting pans use most of a standard oven and leave little room for sides. If you have one oven, weigh the timing gain against the lost rack space.