π° Pan Size Converter
Find pan substitutions based on volume capacity.
Pan Volume Comparison
How to Use This Calculator
This calculator compares the volume of different baking pan sizes so you can find a safe substitution when you do not have the pan a recipe calls for. Select the original pan shape and size, then select your available pan to see how the volumes compare and whether you need to adjust the recipe.
Choose the pan shape your recipe specifies (round, square, rectangular, springform, tube, or bundt).
Enter the pan dimensions from the recipe. For round pans, this is the diameter. For rectangular, it is length x width.
Select the pan you have available and enter its dimensions. The calculator shows both volumes and a scale factor.
If the volumes are within 10% of each other, use the recipe as-is. If the difference is larger, scale the batter and adjust baking time.
Pan Volume Formula
Volume is the only number that matters when switching pans. A 9-inch round pan and an 8-inch square pan hold almost exactly the same volume (about 64 cubic inches), so they are interchangeable for most cakes without any adjustment. The depth of fill changes slightly, which affects baking time, but the recipe amounts stay the same.
Common Pan Volume Reference
Baking Time Adjustments When Substituting Pans
When you use a pan that is shallower than the original, the batter spreads out more and bakes faster. Check for doneness about 10 to 15 minutes earlier than the recipe states. When you use a deeper pan, the batter is thicker and needs more time. A good rule is to add 5 minutes per additional half-inch of depth and always test with a toothpick rather than relying solely on the stated time.
If the volume difference between your pan and the recipe pan is more than 25%, it is better to scale the recipe rather than just adjust time. Too little batter in a large pan produces a very thin cake that dries out easily. Too much batter in a small pan can overflow or leave the centre underbaked. Match the volume first, then handle the time.
Frequently Asked Questions
Why does pan size matter in baking?
Pan size affects batter depth. The same amount of batter in a larger pan bakes thinner and faster; in a smaller pan, it bakes thicker and may need more time.
Can I use a 9-inch pan instead of 8-inch?
Yes, but the batter will be shallower (~20% less volume). Baking time decreases by ~10β20%. Start checking for doneness earlier.
How do I scale a recipe for a different pan?
Calculate the volume ratio (new pan volume Γ· original pan volume), then multiply all ingredient amounts by this factor.
What is the most common cake pan size?
9Γ13 inch rectangular for sheet cakes. 9-inch round for layer cakes. 8-inch round is also very common.
How deep should I fill a pan?
Fill pans Β½ to β full to allow for rising. Angel food and chiffon cakes fill the pan more. Quick breads and pound cakes: about β full.