Baking pan size converter
Find how many of one pan hold a recipe made for another, by matching the area at the same depth.
1.8399″ round
That's about the same as a 9×13 pan.
What it means
How much pan is that?
By base area at equal depth. Deeper or shallower batter changes baking time: check doneness early in smaller pans.
Every unit
That much batter in every pan
Learn
Three things worth knowing
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9×13 ≈ two rounds
One 9×13 ≈ two 9″ rounds ≈ two 8″ squares. A half sheet (13×18) is two 9×13s.
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Standard pans
Pan sizes settled in the 1950s US boxed-cake era, when mixes were written for 9×13 and two 8- or 9-inch rounds.
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Round is smaller
An 8-inch round holds about 21 % less than an 8-inch square.
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Background
About swapping pans
A recipe fills a pan to a certain depth. To use a different pan, match its area: a 9×13 in pan (117 in²) holds about the batter of two 8-inch rounds (101 in²) or two 9-inch rounds slightly thinner (127 in²).