What Size is a Jelly Roll Pan?

A jelly roll pan comes in a variety of sizes. If you’re baking something, it should have the instructions based on size that you’re using. They come in 10 1/2 x 15 1/2 x 1, 12 1/2 x 17 1/2 x 1, and they also have sizes, such as, 27 x 39 x 2 1/2, and 32 x 44 x 2 1/2. Just depends on how large you want it to be.