Cake Pan Size Conversion – Substitute Pan Guide

Convert between cake pan sizes and find the right substitute. Includes volume table, batter amounts, and baking time adjustments.

Round Cake Pan Size Chart

Diameter Area (sq in) Typical Volume Typical Batter
6 inch 28 4 cups 2–2.5 cups
8 inch 50 6 cups 4–5 cups
9 inch 64 8 cups 5–6 cups
10 inch 79 10–11 cups 7–8 cups
12 inch 113 14–15 cups 10–12 cups

Square & Rectangle Pan Chart

Pan Size Area (sq in) Round Equivalent Typical Batter
8×8 inch 64 9-inch round 5–6 cups
9×9 inch 81 10-inch round 7–8 cups
9×13 inch 117 Two 9-inch rounds 10–12 cups
10×15 inch (jelly roll) 150 — 12–14 cups

Common Pan Substitutions

Recipe calls for Substitute with
Two 9-inch rounds One 9×13 inch pan
One 9×13 inch Two 9-inch round pans
One 8-inch round One 8-inch square pan
One 9-inch round One 8-inch square pan
24 cupcakes One 9×13 inch pan

How to Adjust Baking Time When Substituting Pans

Pan size directly affects how your batter bakes. The key variable is batter depth: shallower batter sets faster at the edges and bottom, reducing total bake time.

  • When switching to a larger pan (shallower batter): start checking 10–15 minutes earlier than the recipe states.
  • When switching to a smaller pan (deeper batter): add 10–20 minutes and tent with foil if the top browns before the center is set.
  • Always use the toothpick test: a toothpick inserted into the center should come out with a few moist crumbs but no wet batter.

Volume vs. Area: Why Both Matter

Area tells you how much of the oven floor your pan covers; volume tells you how much batter fits. A 9×13 inch pan (117 sq in) has nearly twice the area of a 9-inch round (64 sq in), which is why it can replace two 9-inch rounds for a single-layer cake. When calculating substitutions, focus on volume — batter depth ultimately determines bake time and texture.

Frequently Asked Questions

Can I use a 9-inch round pan instead of an 8-inch? +
Yes, but with adjustments. A 9-inch round pan holds 27% more volume than an 8-inch (63.6 sq in vs. 50.3 sq in). If you use the same amount of batter, the cake will be shorter and bake faster. Reduce baking time by about 10 minutes and check earlier. Alternatively, increase batter by 25–27% if you want the same height.
How do I find out if my pan holds the right amount of batter? +
Fill your pan with water up to 1 inch below the rim (to allow for rising). Measure the water volume. Compare this to the batter amount in your recipe. As a rule: cake batter should fill the pan 1/2 to 2/3 full. If you're unsure, err on the side of underfilling and bake remaining batter as cupcakes.
How does pan size affect baking time? +
Shallower pans bake faster because the batter is thinner. For every 1/4 inch reduction in batter depth, reduce baking time by approximately 5–7 minutes. Always check for doneness 10 minutes before the recipe's stated time when substituting pans.