Pan Size Conversions (2024)

Published: · Modified: by Helen S Fletcher · This post may contain affiliate links · 10 Comments

Pan Size Conversions (1)

Pan size conversion is one of the most confusing elements of baking whether it is substituting square pans for round pans or for the same shape pans in smaller or larger size.

The easiest way to convert the amount of batter is to use square inches so long as the depth of the pans are the same.

You will notice that square pans of the same size cannot be substituted for round ones if you wish the layers to be the same depth. When converting from round to square pans it takes approximately ⅓ more batter for the square ones.

Pan Size Conversions (2)

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If you are going from a 2” to a 3” pan of the same shape, increase the amount by ⅓.

When you are changing the size, the temperature of the oven remains the same but the time may need to be adjusted up or down depending upon the thickness of the layers.

In my recipes, I give the weights of the finished batter as well as how much should go in each pan. For instance, if a base layer weighs 750 grams or 26 ounces, it can easily be divided into different size layers. This allows you to use a base recipe with different fillings requiring a different number of layers without recalculating each time, making pan size conversions very easy. Using the 750 grams you could make:

2 - 9” layers at 375 grams or 13 ounces each
3 - 9” layers at 250 grams each or 9 ounces each
4 - 9” layers at 185 grams each or 6 ½ ounces each

CALCULATING SQUARE INCHES FOR SQUARE OR RECTANGULAR PANS: For the square pan, multiply two sides of the pan. For instance for an 8 inch square pan, multiply 8x8 = 64 square inches. For a rectangle, simply take the measurements of the long side and the short side of a rectangular one and multiply them, i.e. 9x13=117 square inches.

8” = 64 square inches
9” = 81 square inches
10” =100 square inches
12” =144 square inches
14” = 195 square inches
16” = 256 square inches
18” = 325 square inches
20” = 400 square inches
9”x13” pan – 9x13” = 117 square inches
Quarter sheet pan - 9x13" =117 square inches
Half sheet pan - 18x13" = 234 square inches
Full sheet pan - 18x26" = 468 square inches

From this you can see that you can substitute two 8” pans for the 9”x13” one as 2x64 = 128 square inches which is close enough.

CALCULATING SQUARE INCHES FOR ROUND PANS is a little more complicated.

The formula is: Divide the diameter of the pan in half to obtain the radius. The radius is simply ½ the size of the pan. Multiply that number by itself and then multiply that number by pi which is 3.14.

For instance, the radius of a 9” pan is 4.5 inches.

4.5x4.5 = 20.25 inches.
20.25x3.14 = 63.58 which would round off to 64 square inches.

8” = 50 square inches
9” = 64 square inches
10” = 79 square inches
12” = 114 square inches
14” = 154 square inches
16” = 201 square inches
18” = 254 square inches
20” = 314 square inches

You can see from these measurements, that the batter for a 9" square pan would make one 10" round one. The numbers will not be exact, but as long as they are close they will be fine.

A SECOND WAY to determine pan size is to measure the amount in a pan by cups. I have never used this method as weights are more exact and so much easier.

More Baking Information

  • Yeast as it Relates to Bread
  • Spooning the Crust
  • Three Easy Sugar Fixes
  • Sugar - The Sweetest Part of Baking

Reader Interactions

Comments

  1. Chip says

    Thanks so much for this work. Math is above my pay grade. You have a new follower!

    Reply

    • Helen S Fletcher says

      Hi Chip - Transparency demands that I let you know I had to ask my brother, an aeronautical engineer for a bit of help with the cubic inches. We had tons of engineers in the family and all I could ever do is add, subtract, multiply and divide. Sure I was a disappoint when it came to math! Welcome aboard.

      Reply

        • Helen S Fletcher says

          Thank you Debra. I am happy to have you join us.

          Reply

  2. Mary Soucy says

    As always you are a wealth of information. I always look forward to your posts in my email! :)

    At your suggestion, I would love any tutorials you can put together on baking breads -- maybe French or Italian -- but totally your choice. Breads are about my favorite things to bake. I am always looking for tips and recipes from a pro.

    Thank you for all your efforts!

    Reply

    • hfletcher says

      Hi Mary: How apropos you should suggest bread. I have always loved baking bread also, and I am working on a post regarding yeast. If I finish it for next Monday, then a bread will appear on Thursday. Thanks for the suggestion.

      Reply

      • Mary Soucy says

        Yeah! Thank you!!

        Reply

        • hfletcher says

          You are welcome. My pleasure.

          Reply

  3. vera parker says

    That was so helpful. Thank you.

    Reply

    • hfletcher says

      You're welcome.

      Reply

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Pan Size Conversions (2024)

FAQs

How do you adjust baking times for different pan sizes? ›

If, for example, your recipe calls for an 8-inch cake pan and you only have a 9-inch, relax, no problem. Just increase the oven temp by 25 degrees F and decrease the bake time by a quarter. In this particular example, since your pan is 1 inch larger, more surface area will be exposed.

What is a 9x13 pan equivalent to? ›

A recipe written for a 9” x 13” pan can also be made in two 9” round pans; one 9” round and one 8” round, or two 8” round pans. Baking times may vary due to slightly different depths of batter in the various pan combinations.

Will 2 8x8 pans equal a 9x13? ›

For a rectangle, simply take the measurements of the long side and the short side of a rectangular one and multiply them, i.e. 9x13=117 square inches. From this you can see that you can substitute two 8” pans for the 9”x13” one as 2x64 = 128 square inches which is close enough.

Can I use 2 9 inch cake pans instead of 3 8-inch pans? ›

Here's a standard conversion for many basic cake recipes: A recipe that makes three 8-inch layers will make two 9-inch layers, one 13-by-9 inch sheet, or three to four dozen cupcakes.

Can I use an 8x8 pan instead of a loaf pan? ›

Quick Conversions: The 8x8” Baking Dish can substitute as a 9” round cake pan, a 9x5 loaf pan, or a deep-dish Pie Dish. Halved recipes intended for 9x13 rectangular baking dishes are also compatible.

How long to bake cake in different size pans? ›

Cakes in larger pans will generally bake faster (about . 9 minutes per ounce of batter in a 10-inch pan), while cakes in smaller pans will often take longer (up to two minutes per ounce for a 6-inch pan). Meanwhile, cakes baked in a tube or Bundt pan may only need a minute per ounce of batter.

Can I use 8x8 instead of 9x9 for brownies? ›

A 9x9" metal (aluminized steel) pan yielded crisp-edged, somewhat dense brownies that were unremarkable. An 8x8" glass pan made brownies with cakey, crackly-on-top corners and a very thick, gooey texture within.

Is there a difference between a 9x13 pan and a 13x9 pan? ›

There is no significant difference between a 13- by 9-inch cake pan and a 9- by 13-inch cake pan. They are the same thing. Yes, you read that correctly. For example, pans made by different manufacturers may vary slightly by depth—two inches versus 2¼ inches.

What size is a 9x13 pan doubled? ›

It would seem like a no-brainer that doubling a 9" x 13" recipe would be perfect in a 13" x 18" half-sheet pan. After all, 117 x 2 = 234 exactly.

What is the most common baking pan size? ›

If a recipe calls for a standard-sized pan, it's important to know what that means.
  • Round pans: Usually 8 inches or 9 inches.
  • Square pans: Also typically 8 inches or 9 inches.
  • Rectangle pans: 9 by 13 inches or 11 by 15 inches [for] sheet or jelly roll pans.
  • Loaf pans: 9 by 5 inches.
Dec 22, 2023

How to make a box cake taste homemade? ›

8 Simple Tips and Tricks to Make Box Cake Better
  1. Use Room Temperature Ingredients. ...
  2. Replace Water with Milk or Buttermilk. ...
  3. Substitute Sour Cream in the Mix. ...
  4. Substitute Oil for Butter. ...
  5. Use More Eggs. ...
  6. Add Vanilla Extract. ...
  7. Make It a Chocolate Lovers' Cake. ...
  8. Decorate Your Cake Like A Pro.

Can I use a Bundt pan instead of 9x13? ›

Which Bundt pan is best for a 9" x 13" cake recipe? A. Joanne, bake your recipe calling for a 9″ x 13″ pan (or two 9″ round pans) in either a 10-cup or 12-cup Bundt pan. Increase the baking time by about 30% in the 10-cup pan, somewhat less in the 12-cup.

How do you adjust baking time for smaller portions? ›

A good rule of thumb is to set your timer for half the amount of time called for in the original recipe. So if a 9" x 13" cake takes 50 minutes to bake and you've halved the recipe to bake in a 9" cake pan, set your timer to start checking after 25 minutes.

How do you adjust cooking times for multiple items? ›

It's simple. Use the oven set point for the most delicate item or for the one with the lowest temp. And expect the other item to take longer than normal. Also put the more delicate / lower temp dish on the lower shelf as well.

What happens when you bake the cake in a wrong pan size and pan type? ›

The cake will either be thinner than you want if the pan was bigger than recommended for or will overflow the pan and you'll have to clean your oven if the pan was smaller than recommended.

How do you place pans in the oven if baking in several pans at one time? ›

If your oven is large enough so all three pans fit on the same shelf with none of them touching each other or the oven walls it should work fine. You do not want to be opening the oven and shuffling the layers about, turning the pans or moving them to other levels.

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