The 10x15" pan has a base of 150 sq in (968 cm²).
The 10x15" pan in centimeters, and pans of about the same size
Measured across the top, the 10x15" pan is 25.4 × 38.1 cm, with a base of 968 cm².
Pans within 10 % of its area: two 7x11" pans (154 sq in), two 10" round pans (157.1 sq in) or two 9x9" square pans (162 sq in). A recipe for the 10x15" pan fits these without scaling; if the batter ends up deeper or shallower, adjust the baking time.
Measure a pan across the top, from inside edge to inside edge, not across the bottom or the outside: that is the size recipes and labels give. Pans with sloped sides are smaller at the bottom than the size on the label.
Factors keep the batter as deep as in the 10x15" pan. Below 1 means make less; above 1, more.
Frequently asked questions
How big is the 10x15" pan?
Its base is 150 sq in (968 cm²).
How do I convert a recipe from the 10x15" pan to the 9x13" pan?
Multiply the recipe by 0.78 (about 3/4 ×) so the batter stays as deep. The 9x13" pan is 117 sq in.
Does the baking time change?
If the batter is deeper or shallower than the recipe’s, yes: shallower bakes faster, deeper slower. Start checking early and use the recipe’s doneness test.