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Baking pan size converter: scale any recipe to the pan you have
A different pan, the same recipe. Compare base areas, scale your ingredients and keep a printable list.
Your recipe multiplier
For pans of different depths, baking time may vary; check doneness according to your recipe’s instructions.
How it’s calculated
Round area = π × (diameter ÷ 2)². Square area = side². Rectangle area = length × width. Pan multiplier = your pan’s area ÷ recipe pan’s area. Serving multiplier = target ÷ original servings. Total multiplier = selected multipliers multiplied together. Each ingredient quantity × total multiplier gives its new quantity.
Dimensions in cm are divided by 2.54 before areas are compared. Displayed numbers are rounded; calculations use the unrounded multiplier.
Pan conversion examples
9x13 pan to 8x8 conversion
64 ÷ 117 = 0.55×. 1 cup flour → 0.55 cup.
Convert 9 inch round to 8 inch round
(8 ÷ 9)² = 0.79×.
Common pan examples
| Pan (in) | Base area (in²) | Multiplier from 9 × 13 in |
|---|---|---|
| 8 Round | 50.27 | 0.43× |
| 9 Round | 63.62 | 0.54× |
| 8 × 8 Square | 64 | 0.55× |
| 9 × 9 Square | 81 | 0.69× |
| 9 × 13 Rectangle | 117 | 1× |
| 10 × 15 Rectangle | 150 | 1.28× |
Questions about recipe scaling
How do I scale a recipe for a different pan?
Divide the new pan’s base area by the original pan’s base area, then multiply each ingredient quantity by that ratio. This is an area comparison, not a pan-capacity calculation.
What is the 9x13 to 8x8 conversion factor?
An 8 × 8 inch square has 64 square inches of base area. A 9 × 13 inch rectangle has 117. The ratio is 64 ÷ 117 = 0.547008…: about 0.55 times each ingredient.
Can I adjust pan size and servings together?
Yes. The total multiplier is the pan-area ratio multiplied by target servings divided by original servings. This adds a serving adjustment on top of pan scaling and changes the amount per pan. Use only one option if both describe the same intended change.
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