Cake Pan Converter
Scale a recipe between round pan sizes.
Resize a cake recipe when you change pan size, keeping the same depth.
How the Math Works
The Cake Pan Converter uses a fundamental geometric principle based on the area of a circle. Since cake pans are circular, the volume of batter needed scales with the area of the base, which is calculated as πr². When changing pan sizes, the radius (half the diameter) changes, and because the radius is squared in the area formula, the scaling factor becomes (new diameter ÷ original diameter)². This means doubling the diameter requires four times the batter, while halving it needs only one-quarter.
Practical Applications
To use this calculator, first determine your original pan's diameter and the new pan's diameter. Divide the new diameter by the original, then square the result to find your scaling factor. If your recipe calls for 2 cups of batter and you're moving from an 8-inch to a 10-inch pan, the calculation is (10 ÷8)² = 1.56, meaning you'll need approximately 3.12 cups of batter. Simply multiply each ingredient amount by this factor for perfect proportions.
Day-to-Day Use
This calculator eliminates guesswork when scaling cake recipes for parties, family gatherings, or meal planning. Instead of trying to eyeball ingredient amounts and risking flat or overflowing cakes, you can confidently adapt your favorite recipes to fit any round pan size. Whether you need a single-layer birthday cake for 8 people or a towering celebration cake for 50, the math ensures consistent results every time, reducing food waste and saving valuable kitchen time.
Worked example
8 in → 10 in pan → ×1.56 the recipe.
FAQ
Bake time?
Larger/thicker cakes need longer; check with a skewer.