Round pan to square pan converter
Want to bake a round-pan recipe in a square pan? This gives the equivalent square side.
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How to use it
- Enter round pan diameter and unit.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Square side = diameter × √π ÷ 2 ≈ diameter × 0.8862, since the circle area is π × (diameter ÷ 2)².
Example
Inputs: Round pan diameter = 9, Unit = Inches. Result: Equivalent square side: 7.98 in; Area: 63.6 sq in.
Limits and caveats
- You rarely find a pan of the exact size, so pick the nearest and adjust slightly, or use the pan size converter.
- The corners of a square pan bake faster than the middle.
Questions about this tool
What square pan equals a 20 cm round pan?
A square with a side of about 17.7 cm; an 18 cm square is very close.
What square equals a 9 inch round pan?
About an 8 inch square (7.98 in).
Why is the square side smaller than the diameter?
A square whose side equals the diameter wraps the whole circle and is about 27% larger.