Pan Size Converter
Pick your original pan and your new pan — the tool converts by area, not diameter, and gives you one number to multiply every ingredient by.
Pan Size Converter
From
Pan area: —
To
Pan area: —
Multiply every ingredient by
×1.00
Why area — not diameter — is the correct way
A cake tin's capacity is its cross-section area × depth. When you move from a 6" round to a 9" round, the diameter only grows 1.5×, but the batter needed grows 2.25×. The converter uses this area ratio, so your batter and bake time stay in proportion. For a deeper pan, add 5–10 minutes of bake time and test with a skewer.
Pan Size Converter — FAQ
How do I convert a cake pan size?
Scale by the area ratio of the two pans, not the diameter. Round pans scale as (new diameter ÷ old diameter)² — going from a 6" to a 9" round is (9/6)² = ×2.25, so a 9" round holds about 78% more batter than an 8" and 2.25× a 6".
How much batter is a 9-inch round vs 8-inch round?
An 8" round holds about 50 sq in and a 9" round about 64 sq in — the 9" holds roughly 28% more batter. Multiply every ingredient by 1.27 when going 8" → 9".
Does a square pan hold more than a round pan of the same size?
Yes. An 8" square is 64 sq in versus 50 sq in for an 8" round, about 27% more. That is why the converter asks for the shape — a square pan of the same width carries noticeably more batter.
What is a bundt pan size equivalent?
A bundt pan of the same diameter as a round pan holds roughly 28% less volume because of the centre tube, so its usable capacity is about 0.72× the round pan. Use the bundt option in the converter for the correct factor.
Should I adjust baking time when changing pan size?
Often yes. A larger, shallower pan bakes faster, and a deeper pan needs more time. Start checking 5–10 minutes early when the new pan area is more than ~25% larger than the original.
Why use area instead of diameter to scale recipes?
Batter fills volume, and volume scales with area (for the same pan height). Diameter grows in only one dimension, so it always understates how much more batter the bigger pan holds.