Sourdough Hydration Calculator
Dough hydration percent.
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Kitchen
Cake Pan Conversion Calculator
Scale a recipe between pan sizes by area.
Recipe scale
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Multiply recipe by this.
| Original area | — |
|---|---|
| New area | — |
| — | |
| — |
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Enter your figures above to see the step-by-step working.
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How the Cake Pan Conversion Calculator Works
To move a recipe to a different pan, scale it by the ratio of the pan areas — batter depth stays about the same, so area is what matters. Multiply length by width for each pan and divide the new area by the original. A 9×13 recipe (117 sq in) baked in a 9×9 pan (81 sq in) needs about 0.69 of the recipe.
For round pans, area is π times the radius squared — a 9-inch round is about 64 sq in. Scaling up may need a longer bake; scaling down, a shorter one. Keep the batter depth similar and check for doneness rather than trusting the original time.
scale = new pan area ÷ original pan area
Frequently Asked Questions
How do I convert a recipe to a different pan?
Scale it by the ratio of the pan areas. Divide the new pan’s area by the original pan’s area and multiply the recipe by that.
What’s the area of a round pan?
π times the radius squared. A 9-inch round pan (4.5-inch radius) is about 64 square inches.
Do I need to change the bake time?
Often yes — a different pan changes the batter depth and shape. Start checking earlier or later and judge by doneness, not the original time.
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