Where the 13×18" half sheet sits among sheet pans
| Pan | Holds (brim) | Batter (⅔) | Bake area | Depth |
|---|---|---|---|---|
| 10×15" jelly roll (1" deep) | 10 cups | 6¾ cups | 150 sq in | 1″ |
| 13×18" half sheet (1" deep) | 14 cups | 9¼ cups | 234 sq in | 1″ |
Swapping a recipe into or out of this pan
By capacity, the honest substitutes are 9×13" rectangle (14 cups) — each within 10% of the 13×18" half sheet's 14 cups, close enough that a recipe usually moves over without rescaling. Check the batter comes no more than about two-thirds up the new pan, and remember what still changes is batter depth: depth sets bake time — shallower runs faster, deeper runs slower. The cake pan converter works out the exact time and temperature shift for any pair.
Filling guidance: two-thirds is the working rule for butter and oil cakes. Batters with big oven spring — angel food, chiffon, some sponges — want more headroom, and dense batters (brownies, blondies) tolerate fuller pans because they barely rise.