Cake Pan Size Converter
Swap round, square & rectangular tins.
Swap round, square & rectangular tins.
How to use Cake Pan Size Converter
- Enter the pan your recipe calls for: round, square, or rectangular
- Enter the pan you actually own and its dimensions
- Read the base-area comparison and the exact ingredient scaling factor
About Cake Pan Size Converter
Swap one baking tin for another with confidence. Enter the pan a recipe calls for and the pan you actually own — round, square, or rectangular — and the tool compares their base area and tells you exactly how much to scale the ingredients up or down. It's the fast answer to questions like "can I bake a 9-inch round recipe in an 8-inch square?" or "what can I use instead of a 9x13?", where the real difference comes down to area math rather than the number printed on the pan.
The math is simple once you see it, but easy to get wrong by eye: a round pan uses π×radius², while a square or rectangular pan uses length×width, so an 8-inch square actually holds noticeably more batter than an 8-inch round. The converter runs those numbers for both pans, gives you the scaling ratio, and reminds you that a much deeper or shallower tin shifts the result — and that batter depth changes the bake time even when the oven temperature stays the same.
Use it to switch between round, square, and rectangular pans, to right-size a recipe for the tin in your cupboard, or to check whether two smaller pans add up to one large one. It's completely free, needs no sign-up, and runs entirely in your browser — nothing you type is uploaded anywhere.
Frequently asked questions
- Can I use a different size cake pan than the recipe says?
- Usually yes — you just scale the ingredients by the ratio of the two pans' base areas, which the tool calculates for you. A big difference in size also changes the bake time, so check for doneness earlier or later than the recipe states.
- How much should I scale the ingredients when I change pan size?
- By the ratio of the two base areas: if your pan has 80% of the original pan's area, use about 80% of each ingredient. The converter works out that percentage for you so you don't have to do the area math by hand.
- How do I convert a 9-inch round recipe to an 8-inch square pan?
- Enter the 9-inch round as the recipe pan and the 8-inch square as your pan. A 9-inch round is about 64 square inches and an 8-inch square is also about 64, so it's nearly a straight 1:1 swap — the tool confirms the exact ratio.
- Is an 8-inch square pan the same as an 8-inch round?
- No. A square pan has more area than a round one of the same width because of the corners, so an 8-inch square holds roughly 25% more than an 8-inch round — about the same as a 9-inch round instead.
- How do I swap a round pan for a rectangular one?
- Pick round for the recipe pan and rectangular for yours (or the other way around) and enter the dimensions of each. The tool compares π×radius² against length×width and gives you the scaling factor so the batter ends up a similar depth.
- What can I use instead of a 9x13 pan?
- A 9x13 pan is about 117 square inches, which is roughly two 9-inch round layers or a 12-inch square. Enter 9x13 as the recipe pan and whatever you have as your pan, and the converter tells you how to scale the recipe to fit.
- How does the pan converter work?
- It compares the base area of each pan — π×radius² for round, length×width for square and rectangular — since that area is what determines how thickly the batter spreads and therefore how it bakes.
- Do I need to change the oven temperature or bake time?
- Keep the temperature the same. Adjust the time instead: a deeper batter (smaller pan) needs a few extra minutes, and a shallower one (larger pan) bakes faster, so start checking earlier.
- Does pan depth matter?
- Yes. The tool compares base area assuming both pans are a similar depth. A much deeper or shallower tin changes the total volume, so treat the result as a close starting point rather than an exact figure.
- Is this cake pan converter free to use?
- Yes, it's completely free with no sign-up or limits. It runs entirely in your browser, so the pan sizes you enter stay on your device and nothing is uploaded anywhere.