Thanksgiving pie calculator
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2 pies
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12 slices needed · 2 pies × 8 slices — 4 spare
Assumes one slice per guest, rounded up to whole pies. 8 slices is the yield Pillsbury prints for its 9-inch pies; 6 is our planning choice for bigger slices, not a published figure. Serving a cake too? Put its servings in the last box (the cake serving calculator has Wilton's counts).
How many pies? Chart for 4–30 guests
Pillsbury's 9-inch pumpkin and apple pie recipes each list 8 servings, so that's the standard column. Cutting six bigger wedges is a choice for a generous table, not a standard. Both columns are one slice per guest, rounded up to whole pies:
| Guests | Pies at 8 slices (Pillsbury yield) | Pies at 6 generous slices |
|---|---|---|
| 4 | 1 | 1 |
| 6 | 1 | 1 |
| 8 | 1 | 2 |
| 10 | 2 | 2 |
| 12 | 2 | 2 |
| 15 | 2 | 3 |
| 16 | 2 | 3 |
| 20 | 3 | 4 |
| 24 | 3 | 4 |
| 25 | 4 | 5 |
| 30 | 4 | 5 |
How many pies for 20 people?
3 pies at 8 slices each, with 4 slices to spare — or 4 if you cut 6 generous wedges per pie. Serving several desserts? Count total servings, not servings per dessert: with a cake that serves 12 alongside, 20 guests need just 1 pie.
Sources: Pillsbury, Perfect Pumpkin Pie (9-inch, “Servings: 8”); Pillsbury, Perfect Apple Pie (9-inch, “Servings: 8”). Pie counts are arithmetic on those yields.
Scaling one dough recipe to the whole holiday
Pie dough scales cleanly by weight, so make all of it in one or two batches instead of repeating a single-crust recipe four times. If your single-crust dough starts from 1⅓ cups all-purpose flour, three crusts means 3× everything — 4 cups all-purpose flour, and so on down the ingredient list. Paste your own recipe below and set the factor to your crust count (each 9-inch crust ≈ one single-crust recipe; a double-crust pie counts as two):
Two honest caveats at holiday scale: add the ice water gradually and judge by feel — flour dryness varies more than any recipe admits — and chill the dough in per-crust discs, not one giant block, so it rolls straight from the fridge.
Standard vs deep-dish: the filling math
"9-inch pie plate" describes two different vessels, and both have sloped sides — so we model them as truncated cones, not cylinders. Assuming a 9″ rim and a 7″ base (our modelling assumption, not a measured brand — check yours), a 1¼″-deep standard plate holds about 4.4 cups brim-full, and a 2″-deep dish about 7.0 — roughly 1.6× the capacity. These are estimates for the plate itself; brands vary, so filling yours with water is the only exact answer, and fillings mound or sit below the rim depending on the pie. The practical rules:
- Deep-dish recipe → standard plate: you'll have filling left over. Bake the surplus in ramekins as crustless custards rather than overfilling — pumpkin pie that rises over the rim cracks as it settles.
- Standard recipe → deep-dish plate: it fits easily but bakes shallower than the recipe expects, so start checking early. For a custard pie like pumpkin, Pillsbury's doneness test is a knife inserted near the center coming out clean.
- Own an odd-sized plate? The pan volume calculator gives a straight-sided pan's capacity from its dimensions — for a sloped pie plate, treat it as an upper bound, or measure with water.
One oven, one day: the schedule that works
The turkey owns the oven for most of Thursday, and pies want their own heat: Pillsbury's apple pie bakes at 425°F, and its pumpkin pie starts at 425°F before dropping to 350°F. The schedule that removes all conflict:
- Well ahead: make and freeze dough discs. Thaw overnight in the fridge before rolling.
- Wednesday: bake every pie. Overnight storage differs by pie type — follow FoodSafety.gov's storage guidance for which pies need the fridge; that call is theirs, not ours. Wednesday's oven is empty and yours.
- Thursday: the turkey bakes; you don't. While it rests, the oven is free for rolls and crisping sides.
- Serving: if you want pumpkin pie warm, a short spell in a low oven while dinner is cleared beats the microwave.
Baking from a UK/EU recipe, or in a fan oven? The oven temperature converter maps °F ↔ °C ↔ gas marks, including the fan-oven reduction. And once Thanksgiving is done, the whole December lineup — cookie swaps, gift batches, the New Year's cake — lives on the Christmas baking hub.