Baking Pan Converter
Quick answer: To swap baking pans, scale the batter by the ratio of their areas — an 8-inch square (64 in²) holds about the same as a 9-inch round.
Only have a square pan when the recipe wants round? Compare pan areas and scale your batter so it bakes up right.
Common pan areas
| Pan | Area | Holds like |
|---|
| 8" round | 50 in² | ~6 cups |
| 9" round | 64 in² | ~8 cups |
| 8" square | 64 in² | ~8 cups |
| 9×13" rect | 117 in² | ~14 cups |
How it works
Swapping pans comes down to surface area. A recipe fills a pan to a certain depth, so to keep that depth in a different pan you scale the batter by the ratio of the two areas. The tool computes each pan's area and hands you that multiplier — just remember a wider, shallower pan bakes faster and a deeper one slower, so adjust the time.
Frequently asked
How do I use the batter multiplier?
Multiply each ingredient by the number shown to fill the new pan to a similar depth. Under 1 means make less batter.
Will the bake time change?
Yes. A wider, shallower pan bakes faster; a deeper one takes longer. Start checking a few minutes before the original time.
Are round and square interchangeable?
An 8-inch square holds about the same as a 9-inch round, so they swap nicely — the converter shows the exact ratio.
Can I use a glass pan instead of metal?
Yes, but glass holds heat, so lower the temperature about 25 °F and expect slightly longer bake times.
How full should I fill a cake pan?
About two-thirds. Overfilling overflows; underfilling bakes flat and dry — the batter multiplier keeps the depth consistent.
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