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Baking pan size converter

Convert a recipe between round, square, rectangular, loaf and bundt pans.

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Baking pan size converter
A recipe written for one pan rarely fits another without adjustment, and eyeballing it usually means a scorched edge or a raw middle. This tool compares your original and target pans by area — round, square, rectangular, loaf or bundt — and tells you two things: the percentage to scale every ingredient by, and roughly how much to change the baking time if you decide not to rescale.
Pick a shape and enter its dimensions for both pans. Round and bundt pans use a diameter; square, rectangular and loaf pans use a side or a length and width; a bundt pan also takes its centre tube diameter, since that hole reduces the usable area. Batter height is the depth you want the batter to reach — it is shared between both pans, since keeping that depth constant is exactly what the recipe-scale percentage achieves. Choose centimeters or inches to match how your recipe is written.
Paste your ingredient list into the input box and each line's leading quantity is scaled by the same percentage — "2 cups flour" becomes "3.37 cups flour" for a pan that's 68% bigger. Step numbers and bullet points are left alone, and lines with no leading number (an instruction, a heading) pass through unchanged. The result updates as you type or change any option.
Everything runs locally in your browser — your recipe is never uploaded or stored anywhere. When you're done, copy the result, download it as a .txt file, or send it straight into another tool such as the recipe scaler for a different kind of adjustment.
FAQ
How is the recipe-scale percentage calculated?
It compares the area of the two pans (or, for a bundt pan, the outer circle minus the centre hole) and expresses the target pan's area as a percentage of the original. Scaling every ingredient by that percentage keeps the batter at the same depth in both pans.
What does the baking time adjustment mean?
It estimates what happens if you pour the same, un-scaled amount of batter into the new pan instead: a bigger pan spreads it thinner and needs less time, a smaller one makes it deeper and needs more. If you do rescale the recipe by the percentage shown, the depth — and so the time — stays close to the original.
Why does a bundt pan need two measurements?
A bundt or tube pan has a hole through the middle, so its usable area is the outer circle's area minus the centre tube's. Enter the outer diameter and the tube diameter, and the tube diameter must be smaller.
Does it convert ingredient units too?
No — it scales the quantity in front of each ingredient and leaves the unit as written. To convert between units such as cups and grams, send the output to the cooking converter or the unit converter.
Is my recipe uploaded anywhere?
No. The pan-size math and the recipe scaling both run entirely in your browser — nothing you type or paste is sent to a server.