Cake Pan Converter — Scale Recipes Between Pan Sizes
Need to bake a 9-inch round cake recipe in an 8-inch square pan? Enter both pans' shapes and dimensions and get a precise scale factor — multiply every ingredient by that number and no guesswork, no overflowing batter.
Original pan shape
in
in
New pan shape
in
in
Multiply every ingredient quantity by this number
- 1
Original pan volume
π × (9 ÷ 2)² × 2 = 127.2 in³ - 2
New pan volume
8 × 8 × 2 = 128 in³ - 3
Scale factor
128 ÷ 127.2 = 1.01Multiply every ingredient in the original recipe by this number.
How does this calculator work?
Scale factor = new pan volume ÷ original pan volume. Round V = π(d/2)²h; rectangular V = l × w × h. Multiply every ingredient by the scale factor. A 9" round (2" deep) ≈ 127 in³; a 9×13" (2" deep) ≈ 234 in³ — so that substitution needs roughly twice the recipe.
Formula
How this is calculated
What matters when substituting cake pans is total volume, not just footprint area — batter fills a pan to a specific depth, and a thinner fill bakes faster while a deeper fill bakes slower. This calculator computes the volume of each pan: round pans use V = π × (d/2)² × h; square and rectangular pans use V = l × w × h. The scale factor is simply new volume ÷ original volume — multiply every ingredient by that number to keep the batter depth (and thus bake time) as similar as possible.
A scale factor of 1.0 means the pans are equivalent and no adjustment is needed. A factor above 1 means the new pan is larger: more batter, thinner layer, potentially a few minutes less baking. A factor below 1 means less batter goes into a smaller pan, which fills more deeply and may need extra time. Always test with a toothpick; the exact time depends on your oven and batter type.
The calculator works in inches, matching the most common US baking specifications. For metric pans in centimetres, enter centimetre values directly — the scale factor is dimensionless and remains correct as long as both pans use the same unit.
Frequently asked questions
A single 9-inch round (2" deep) has a volume of about 127 in³, while a 9×13-inch pan (2" deep) holds 234 in³ — nearly twice as large. You would need roughly double the recipe. A more common swap is two 9-inch rounds for one 9×13 sheet cake, which gives a similar total volume.
Generally, no — the same temperature applies. Only the bake time changes with fill depth. A shallower fill bakes faster (check 5–10 minutes early); a deeper fill bakes slower (add 5–10 minutes). Monitor doneness with a toothpick rather than relying on the original timer.
Standard round cake pans are 2 inches deep; springform pans are 2.5–3 inches. Sheet pans are typically 1 inch deep. Loaf pans are about 3 inches. Enter the actual measured depth of your pan for the most accurate conversion.
TG we-Calculate Editorial Team. (2026). Cake Pan Converter — Scale Recipes Between Pan Sizes [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/cake-pans-calculator
TG we-Calculate Editorial Team. "Cake Pan Converter — Scale Recipes Between Pan Sizes." TG we-Calculate. 2026. https://we-calculate.com/calculator/cake-pans-calculator.
TG we-Calculate Editorial Team, "Cake Pan Converter — Scale Recipes Between Pan Sizes," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/cake-pans-calculator
@misc{wecalculate_cake_pans_calculator, title = {Cake Pan Converter — Scale Recipes Between Pan Sizes}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/cake-pans-calculator}}, year = {2026}, note = {TG we-Calculate} }
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