Baking pan size converter

Compare pan areas and find the recipe multiplier for the same batter depth.

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Original width or diameter

Original length (rectangle)

New width or diameter

New length (rectangle)

Your result

More options and calculation details

Original shape

New shape

Use the same length unit for every dimension. Measure inside the pans. Length is ignored for a round pan. This comparison holds batter depth constant.

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Updated 2026-09-19

How this conversion works

A rectangular pan’s area is width × length. A round pan’s area is π × (diameter ÷ 2)². Divide the new area by the original area to get the ingredient multiplier.

Area scaling preserves batter depth only when the inside shape and usable depth match the assumption. Pan material and oven behavior still affect baking.

Next: Recipe scale conversion calculator

A worked example

A 20 × 20 pan has area 400. A 30 × 20 pan has area 600. Multiply ingredients by 600 ÷ 400 = 1.5 for the same batter depth.

Next: Cooking measurement converter

Before you use the result

Does not calculate bake time or safe fill depth. Sloped sides, tube pans, complex shapes and different batter depths require measured capacity instead. Nonzero numeric inputs for these compound calculations are limited to 1e-40 through 1e40.

Next: Volume converter

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ToolOctopus. “Baking pan size converter.” Updated 2026-09-19. https://tooloctopus.com/baking-pan-size-converter.

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