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All toolsKitchenBaking pan size converter
Different pan. Clear proportions.

Baking pan size converter

Switch between round, square and rectangular pans. Find how much to scale your recipe to keep the same batter depth, or compare the depth if you keep the same amount of batter.

Compare your pans

Measure inside the pan. Enter decimal points or decimal commas, without thousands separators. All pans within each group must have the same dimensions.

Original pans
Replacement pans

Changing units converts the dimensions. Use dimensions from 0.000001 to 1,000,000 and whole pan counts from 1 to 1,000.

Your recipe multiplier

—
Multiply each ingredient by this factor for equal batter depth.
Total original area—
Total replacement area—
Depth with unchanged batter (% of original)—

This compares area, not pan capacity. Check pan height and room for rising. Equal area does not guarantee identical baking.

Scale your ingredient quantities

How to convert baking pan sizes

  1. Choose the original pan shape, inside dimensions and number of pans required by the recipe.
  2. Enter the replacement pans. For a square, use the same length and width. Each group can use inches or centimeters.
  3. Multiply every ingredient by the displayed factor to preserve the original batter depth. Divide the scaled batter evenly between identical replacement pans.
  4. If you keep the original batter quantity, the depth percentage describes the new depth relative to the old depth. It is not a fill percentage or a safety limit.

The area-ratio method

Round area = π × (diameter ÷ 2)². Rectangular area = length × width. Multiply each area by its pan count, then divide replacement area by original area. One inch is exactly 2.54 centimeters.

The unchanged-batter depth ratio is the inverse of the area ratio. Results assume straight sides and equal batter distribution. Display rounding does not change the calculation.

Worked examples

One 8-inch round pan to one 9-inch round pan: 9² ÷ 8² = 81 ÷ 64 = 1.265625. Use 1.265625 times each ingredient for equal depth. Keeping the original batter gives about 79.01% of the original depth.

One 9 × 13-inch rectangle to two 9-inch round pans: (2 × π × 4.5²) ÷ (9 × 13) ≈ 1.087474. That is about 1.0875 times the recipe for equal depth, not an exact one-for-one match.

Before you bake

Does this tell me the new baking time or temperature?

No. Shape, batter depth, pan material and the recipe affect baking. Follow recipe-specific guidance and check doneness; do not multiply baking time by the recipe factor.

Can I compare Bundt, tapered or shaped pans?

Not reliably with this area method. Measure usable capacity and consult guidance for the actual pan and recipe. Rim dimensions alone do not describe tapered sides, center tubes or decorative shapes.

How do I scale part of an egg?

Beat the egg and weigh the portion needed for your multiplier. Keep ingredient ratios consistent, but remember that large recipe changes can need testing, especially for leavening, mixing and baking.

Sources and assumptions

King Arthur Baking: alternative pan sizes

King Arthur Baking: why pan size matters

This tool uses geometric areas without rounding common pans into equivalent sizes. It does not check whether your batter fits safely or predict baking results. Inputs stay in your browser.