Pan Volume Comparison Chart
| Pan Size | Round (cups) | Square (cups) | Area (sq in) |
|---|---|---|---|
| 4 × 2" (10 cm) | 2 cups | 3 cups | 13 / 16 |
| 5 × 2" (13 cm) | 3 cups | 4 cups | 20 / 25 |
| 6 × 2" (15 cm) | 4 cups | 6 cups | 28 / 36 |
| 7 × 2" (18 cm) | 5.5 cups | 8 cups | 38 / 49 |
| 8 × 2" (20 cm) | 7 cups | 10 cups | 50 / 64 |
| 9 × 2" (23 cm) | 8.5 cups | 13 cups | 64 / 81 |
| 10 × 2" (25 cm) | 11 cups | 16 cups | 79 / 100 |
| 12 × 2" (30 cm) | 15 cups | 23 cups | 113 / 144 |
| 14 × 2" (36 cm) | 21 cups | 31 cups | 154 / 196 |
| 16 × 2" (41 cm) | 27 cups | 40 cups | 201 / 256 |
| 18 × 2" (46 cm) | 34 cups | 51 cups | 254 / 324 |
| 20 × 2" (51 cm) | 33 cups | 42 cups | 314 / 400 |
| 9 × 13" sheet | 14 cups | 117 | |
| 12 × 18" half-sheet | 30 cups | 216 | |
Volumes assume 2" tall pans. For 3" deep pans, multiply volume by 1.5.
How to Substitute Cake Pan Sizes
Recipes are written for a specific pan, but you don't always have that exact pan. The good news: you can swap almost any pan for another as long as you adjust the batter amount and baking time. The key principle is simple — match the volume of batter to the volume of the pan.
The Golden Rule: Fill Pans ½ to ⅔ Full
Cake batter rises as it bakes — some recipes nearly double in height. If you fill a pan more than two-thirds full, you risk overflow. Less than half full and you'll get a thin, dry layer. The sweet spot is between half and two-thirds for most cake batters.
Adjusting Bake Times
When you change pan sizes, bake time changes too. The rule of thumb: larger pans = longer bake times, smaller pans = shorter. Going from a 9" to an 8" round doesn't change time much, but going from a 9" to a 6" can add 10-15 minutes because the batter is deeper.
Always start checking 5-10 minutes before the expected time. Use the toothpick test: insert a toothpick in the center — if it comes out clean or with a few moist crumbs, it's done.
When to Use Multiple Pans
If your recipe makes more batter than your target pan holds, split it into two pans rather than overfilling. Two thinner layers are better than one overflowed mess. You can always stack them with frosting between for a taller cake.
Round vs Square Conversion
A round pan holds about 78.5% of the batter that a square pan of the same size holds (because π/4 ≈ 0.785). So if your recipe calls for a 9" square pan, you'll need a 10" round pan to hold approximately the same amount of batter.
