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Cake Pan Conversion

Free Cake Pan Conversion calculator with clear step-by-step results.

About Cake Pan Conversion

A round pan and a square pan hold the same batter when their base areas match, and the side of that equivalent square is simply the square root of the circle's area. If your square pan is a different size, the area ratio is the factor to scale the recipe by.

Formulas

Round pan area

Area = pi x (diameter / 2)^2

Equivalent square side

Side = square root of the round pan area

Worked example

With the default values below, Cake Pan Conversion returns Square pan that matches the round one of 17.72. Change any input above and every figure here is recalculated in your browser.

Inputs used

Round pan diameterminimum 5 cm
20 cm
Pan depthminimum 1 cm
7 cm
Square pan side you ownminimum 5 cm
18 cm

Results

Square pan that matches the round one
17.72 cm
Round pan base area
314.2 cm2
Round pan capacity
2,199 ml
Multiply the recipe by for your square pan
1.031 x

Step by step

  1. 1Values used
  2. 2Round pan area
  3. 3Equivalent square side
  4. 4Square pan that matches the round one= 17.72 cm
  5. 5Round pan base area= 314.2 cm2
  6. 6Round pan capacity= 2,199 ml
  7. 7Multiply the recipe by for your square pan= 1.031 x

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Is a 20 cm round the same as a 20 cm square?

No. The square holds about 27% more batter, because a 20 cm circle is 314 cm2 and a 20 cm square is 400 cm2. The matching square for a 20 cm round is about 17.7 cm.

Do corners change the bake?

Slightly - square corners receive heat from two sides and set sooner, so check for doneness a few minutes early and consider lining the corners.

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