Baking Pan Size Converter

Adapt a recipe to a different cake tin or baking pan — round, square or rectangular.

Result

Enter your values and select Calculate to see the result.

Runs in your browser — nothing you enter is sent to a server.

How the Baking Pan Size Converter works

Enter the pan from the recipe and the pan you have — round (diameter), square (side) or rectangular (length and width), in the same unit. The converter compares their areas and tells you how much to multiply the recipe by so the batter stays the same depth.

Formulas

Areas

round = π × (diameter ÷ 2)², square = side², rectangle = length × width

Scale

multiply by = your pan area ÷ recipe pan area

Examples

20 cm round to 20 cm square

The square holds about 1.27× as much — scale the recipe by 1.27.

9-inch round to 8-inch square

Almost the same (×1.01), so use the recipe as it is. A 9 × 13 in pan holds nearly twice a 9-inch round (use 0.54 of it for one round).

Frequently asked questions

What about pan depth?

The converter assumes the same depth of batter. A deeper pan needs a longer, lower bake.

Does baking time change?

Yes — shallower cakes bake faster, deeper ones slower. Start checking early.

How do I scale the ingredients?

Use the Recipe Scaler with the multiplier shown here.

Recipe Scaler

Double, halve or rescale a recipe for any number of servings — fractions included.

Cooking Tools

Oven Temperature Converter

Convert oven temperatures between °C, °F and gas marks, and adjust for fan (convection) ovens.