Cake Pan Size Converter (by Area)
Convert between round, square, rectangular pans by surface area. Same depth implied.
Result
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How to use this calculator
- Set "from" pan dimensions.
- Set "to" pan dimensions.
- Multiply recipe ingredients by the ratio.
- Adjust bake time slightly: shallower pan = faster bake.
About this calculator
Pan substitution works on surface area when depths match. A round 9" pan has area π × 4.5² ≈ 63.6 in²; a square 8" pan is 64 in² — close enough that the swap is 1:1. But a 9×13 rectangle (117 in²) and a round 9" (63.6 in²) differ ~1.84×, so scale recipe by that factor. Always match pan depth too — same area but deeper pan needs longer baking time. For volumetric (loaf, bundt) shapes, use cake-pan-volume instead.
Frequently asked
When is area swap fine?+
When pan depth matches and the bake is mostly area-dependent (cakes, brownies, sheet bakes).
When does it fail?+
For loaf pans, bundt pans, deep-dish pies — depth and shape change baking dynamics. Use volume-based conversion instead.
Bake time adjustment?+
Same area, same depth: same bake time. Smaller area or shallower: 10-20% less time. Bigger or deeper: more time, same temp.
Why π × (d/2)² ?+
Standard area formula for circles. For a 9" round: π × 4.5² ≈ 63.6 in².
9×13 vs. two 9" rounds?+
Two 9" rounds = 127 in²; 9×13 = 117 in². Recipes designed for 9×13 ≈ scale 92% for two-9"-round.
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