Round to Square Cake Tin Converter

Find an equal-area square side for cake-tin dimensions from a round tin diameter. Enter your own quantities and see the worked example.

How to use Round to Square Cake Tin Converter

1. Enter Round Tin Diameter in the matching stated or selected unit. 2. This matches base areas only. Compare suitable depth and pan shape before transferring a recipe; equal area does not set bake time. Measure the usable inside base of a straight-sided tin. Area ratios preserve batter depth only when comparable tins have suitable depth; decorative shapes and capacity are not inferred. 3. Select Convert or press Enter to see the result. 4. Select Select Copy result to copy the answer, or Reset to clear the form.

Why use this tool?

Use this tool to find an equal-area square side for cake-tin dimensions from a round tin diameter. Use internal base dimensions and check depth, batter rise and the recipe’s doneness guidance separately.

How the calculation works

Equal-area square side = internal round diameter × √π ÷ 2. This matches base areas only. Compare suitable depth and pan shape before transferring a recipe; equal area does not set bake time. Measure the usable inside base of a straight-sided tin. Area ratios preserve batter depth only when comparable tins have suitable depth; decorative shapes and capacity are not inferred. Decimal quantity arithmetic uses the entered values before display rounding. Quantities use up to six decimal places; smaller nonzero results use scientific notation. Currency uses the selected currency’s minor unit. Inputs and numeric results are bounded by magnitude 9,007,199,254,740,991. Pan-area reference: https://www.kingarthurbaking.com/blog/2019/04/23/the-essential-alternative-baking-pan-sizes

Example

Cake Tin Area example: A round 20 cm base has the same area as a square base with side approximately 17.724539 cm.

Practical tip

Use internal base dimensions and check depth, batter rise and the recipe’s doneness guidance separately.