Baking · pan swap

9-inch round to 9x13 pan

Going from a single 9-inch round to a 9x13? Here's how much to scale the recipe.

In short

A 9-inch round is about 64 in²; a 9x13 is 117 in² — nearly double. Multiply the recipe by about 1.8× to fill the 9x13 to the same depth, and expect a somewhat longer bake.

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Conversion
Scale ingredients1.16×
From area
To area
Time

Geometry is exact area math; temperature and time are directional guidance from baking practice, not formulas. Always test for doneness.

About this conversion

The ingredient scale factor is exact area math. Bake time follows batter depth, not volume — so we give the direction to adjust and a doneness cue rather than a fabricated time. Switch to “keep same batter” if you're not scaling the recipe, just using a different pan.

Converting different pans? Use the full pan size converter.

How much bigger is a 9x13 than a 9-inch round?
About 1.8 times the area, so a recipe needs roughly 1.8× the ingredients to fill a 9x13 to the same depth as a 9-inch round.

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