Pan size converter

Baking in a different pan? Pick the pan the recipe uses and the one you have. You get how much to make, how deep it bakes, what that does to the time, and what done looks like.

Rescaling Greek-Style Lemon Oregano Roasted Potatoes, written for 9x13-inch rectangle. Pick your pan and the amounts below change.

9-inch round → 8x8-inch square

Make the recipe as written: the pans hold about the same (×1.01).

Pan	Area	Holds to the rim	Depth
Recipe: 9-inch round	64 sq in	about 9 cups	2 in rim
Yours: 8x8-inch square	64 sq in	about 9 cups	2 in rim, batter as deep as the recipe

Worked out by area, so the batter stays about as deep as in the recipe's pan.

Bake time

The batter stays about as deep as in the recipe, so the time stays close. Start checking about 5 minutes early, since a different shape bakes a little differently.
In a light metal pan, keep the oven temperature the recipe gives. Glass and ceramic heat up more slowly than metal, then hold the heat, so batter in them often takes longer to bake and the edges can overbake before the middle is done. For glass, King Arthur Baking's advice is to lower the oven 25°F and allow up to 10 minutes more. Dark metal browns the most, so watch the edges.

How you know it's done

Bubbling at the edges and hot in the center: 165°F on a thermometer for dishes with eggs, meat or leftovers (USDA).

The recipe's own cue in its steps comes first; the clock is only a guide.

Greek-Style Lemon Oregano Roasted Potatoes, for 8x8-inch square

The amounts as written, about 6 servings.

2 ½ lb Yukon Gold potatoes, scrubbed
⅓ cup olive oil
⅓ cup lemon juice, about 2 lemons
½ cup chicken broth, or vegetable broth
4 cloves garlic, minced
2 tsp dried oregano
1 ¼ tsp kosher salt
½ tsp black pepper
1 tsp lemon zest
2 tbsp parsley, chopped (optional)
¼ cup feta, crumbled (optional)

Rounded to kitchen measures. Pinches, salt and leavening can go to the nearest easy amount.

Back to the recipe

Common swaps

Recipe pan	Your pan	Make
9x13-inch rectangle	8x8-inch square	×0.55
8x8-inch square	9x13-inch rectangle	×1.83
9x13-inch rectangle	2 × 9-inch round	×1.09
9-inch round	8x8-inch square	the same amount
9x5-inch loaf	8x8-inch square	the same amount
8x8-inch square	9x5-inch loaf	×0.7
9x13-inch rectangle	18x13-inch half sheet	the same amount
9x13-inch rectangle	13x9-inch quarter sheet	×0.5
10-inch Bundt (12 cups)	9x13-inch rectangle	×1.35
9x5-inch loaf	8½x4½-inch loaf	×0.78

An 8x8 square and a 9-inch round hold about the same, so they swap without changes. Two 9-inch rounds come close to one 9x13.

How the converter works

A pan's area is width × length, or 3.14 × radius × radius for a round. Flat pans compare by area, so the batter stays as deep as the recipe meant.
If your pan is shallower than that depth needs (a sheet pan for a 9x13 recipe), the amount is scaled to what your pan holds instead, and it bakes thinner and faster.
Bundt and tube pans compare by how much they hold; fill any pan about half to two-thirds full so the batter has room to rise.
It's better to go a little bigger than smaller: a too-full pan can overflow and bakes slowly in the middle.
Capacities are filled to the rim with straight sides; sloped sides and rounded corners hold a little less. Pie plates vary the most.

Our baked recipes, by pan (57)

Each one has a "Different pan?" link next to its ingredients.

8x8-inch square 8 recipes: Apple Cinnamon Baked Oatmeal, Blueberry Baked Oatmeal, Classic Lemon Bars with Shortbread Crust, Cream Cheese Swirl Brownies, Fudgy One-Bowl Cocoa Brownies, Hot Baked Spinach Artichoke Dip, Raspberry Oat Crumble Bars, Sweet Honey Cornbread with Honey Butter
9x13-inch rectangle 28 recipes: Baked Mac and Cheese with Crispy Topping, Baked Muffuletta-Style Party Sliders, Brown Butter Chocolate Chip Blondies, Cheddar-Topped Beef Cottage Pie, Cheesy Beef and Rice Stuffed Peppers, Chicken Enchiladas with Red Chile Sauce, Classic Cinnamon Rolls with Cream Cheese Frosting, Classic Creamy Scalloped Potatoes, Classic Herb Bread Stuffing, Classic Lamb Shepherd's Pie, Classic Meat Sauce Lasagna, Creamy Salsa Verde Chicken Enchiladas, Easy Oven-Baked Chicken Breasts, From-Scratch Green Bean Casserole, Greek-Style Lemon Oregano Roasted Potatoes, Jack-o'-Lantern Stuffed Peppers, Mediterranean Quinoa Stuffed Peppers with Feta, One-Bowl Chocolate Sheet Cake with Fudgy Frosting, Oven-Baked Eggplant Parmesan, Overnight Cherry Tomato and Olive Focaccia, Overnight Sausage and Hash Brown Breakfast Casserole, Overnight Veggie Breakfast Casserole, Rosemary Sea Salt Focaccia, Soft Buttery Pull-Apart Dinner Rolls, Spinach and Ricotta Lasagna, Sweet Potato Casserole with Pecan Streusel, Three-Cheese Baked Ziti, Vegan Black Bean and Rice Stuffed Peppers
9-inch round 3 recipes: Classic Butter Shortbread Wedges, Two-Layer Carrot Cake with Cream Cheese Frosting, Yellow Birthday Layer Cake with Chocolate Frosting
9-inch springform 1 recipe: New York-Style Cheesecake
9-inch pie plate 7 recipes: Classic Chicken Pot Pie, Classic Double-Crust Apple Pie, Classic Pecan Pie, Crumb-Topped Apple Pie, Lattice-Top Tart Cherry Pie, Quiche Lorraine with Bacon and Gruyère, Silky Classic Pumpkin Pie
9x5-inch loaf 7 recipes: Chocolate Chip Walnut Banana Bread, Classic One-Bowl Banana Bread, Classic Vanilla Butter Pound Cake, Honey Whole Wheat Sandwich Bread, Moist Cinnamon Walnut Zucchini Bread, Soft Classic White Sandwich Bread, Spiced Pumpkin Bread
18x13-inch half sheet 2 recipes: Crispy Oven-Baked French Fries, Crispy Sweet Potato Oven Fries
10-inch Bundt (12 cups) 1 recipe: Lemon Cream Cheese Bundt Pound Cake

More conversions

Pan size tables All kitchen conversions Oven temperatures Baking recipes

Sources

King Arthur Baking: Why the size of your baking pan matters so much: bigger pans bake faster, smaller ones slower; fill pans half to two-thirds full; glass, ceramic and dark metal.
King Arthur Baking: Glass or metal or stoneware: glass heats slowly, then holds heat, so it often bakes longer; lower the oven 25°F and allow up to 10 minutes more.
King Arthur Baking: The essential alternative baking pan sizes: working out a pan's area; 8-inch square equals 9-inch round; the 2-inch depth the math assumes.
USDA FSIS: Safe minimum internal temperature chart: 165°F for casseroles.

Pan areas and capacities are our own math from the pans' sizes; the bake-time and fill advice follows the sources. Read October 2026.