Cake Pan Converter
Scale a cake recipe from the original pan to the pan you own with cake pan size conversion by area or usable volume.
Area mode assumes similar batter depth. Volume mode uses geometric or known capacity. Do not fill pans to the rim.
How Do I Convert a Cake Recipe to a Different Pan Size?
Compare the original and target pan sizes. For pans with similar depth, divide the target pan's top area by the original pan's area and multiply every ingredient by that factor. If pan depth or capacity changes significantly, compare usable volume instead.
9×13 to 8×8
×0.547
8" round to 9" round
×1.266
8×8 to 9" round
About 1× at similar depth
After changing pan size, use the Recipe Scaler Calculator if you also need a different number of servings.
How to Convert a Cake Recipe to a Different Pan
- Identify the original pan.
- Identify the target pan.
- Choose Area or Volume mode.
- Read the scale factor.
- Multiply every ingredient by that factor.
- Check batter fill — stay around ½ to ⅔ full for most cakes.
- Start checking bake time according to the new pan, not a scaled minute count.
Area vs Volume: Which Should I Use?
Cake pans are three-dimensional. Top area is enough when both pans bake at about the same depth. Capacity matters when one pan is much deeper, shallower, or a Bundt.
Use Area Mode when
- Original and target depths are similar
- You are making a normal cake or bar substitution
- You want a simple recipe scaling factor
Use Volume Mode when
- Depth changes significantly
- You are comparing loaf, Bundt, or specialty pans
- You know the actual cup capacities
Cake Pan Conversion Formula
| Shape | Formula |
|---|---|
| Rectangle | Area = Length × Width |
| Square | Area = Side² |
| Round | Area = π × (Diameter / 2)² |
| Area scale | Scale factor = Target area ÷ Original area |
| Volume | Volume = Area × Depth |
| Recipe scale | New amount = Original amount × Scale factor |
Example: 2 cups × 0.75 = 1.5 cups. Estimated geometric volume is not the same as usable batter capacity unless you entered a known capacity.
Cake Pan Size Chart
| Pan | Approx. area |
|---|---|
| 6" round | 28.3 in² |
| 8" round | 50.3 in² |
| 9" round | 63.6 in² |
| 10" round | 78.5 in² |
| 8×8 | 64 in² |
| 9×9 | 81 in² |
| 9×13 | 117 in² |
| 10×15 | 150 in² |
| 11×7 | 77 in² |
Cake Pan Substitutions
The best cake pan substitute usually has a similar baking area, similar depth, and a similar batter capacity for the recipe type. Cakes, brownies, loaf cakes, and Bundt cakes do not always swap the same way.
| From | To | Approx. area factor |
|---|---|---|
| 8" round | 9" round | ×1.266 |
| 9" round | 8" round | ×0.79 |
| 8" round | 8×8 | ×1.273 |
| 8×8 | 9" round | ×0.994 |
| 9×13 | 8×8 | ×0.547 |
| 9×13 | 9" round | ×0.544 |
9×13 Pan Substitutions
A 9×13 pan has 117 in² of top area. An 8×8 has 64 in², so the area factor is 64 ÷ 117 = 0.547. Two 9" rounds total about 127.2 in² — slightly larger than one 9×13 — so the layers are usually a bit thinner.
8-Inch Round vs 9-Inch Round
A 9" round is about 26.6% larger in area than an 8" round (63.6 ÷ 50.3 ≈ 1.266). The diameter only looks 12.5% bigger, which is why comparing diameter alone is misleading.
8×8 vs 9-Inch Round
An 8-inch square pan (64 in²) and a 9-inch round pan (about 63.6 in²) have nearly the same top area. For common similar-depth pans, they can often be substituted. That is not universal for every depth or pan design.
Cake Pan Capacity
Geometric volume is area × depth. Usable baking capacity is how much batter the pan should realistically hold. Do not fill any pan to the geometric top.
| Pan | Geometric volume | ~⅔ full estimate |
|---|---|---|
| 8" round × 2" | 7 cups | 4.6 cups |
| 9" round × 2" | 8.8 cups | 5.9 cups |
| 8×8 × 2" | 8.9 cups | 5.9 cups |
| 9×9 × 2" | 11.2 cups | 7.5 cups |
| 9×13 × 2" | 16.2 cups | 10.8 cups |
| 10-cup Bundt | Use the labeled 10-cup capacity, not a cylinder estimate | |
| 12-cup Bundt | Use the labeled 12-cup capacity | |
How Much Batter Does My Pan Hold?
The answer depends on footprint, depth, shape, safe fill level, and pan design. Geometric capacity is not safe batter capacity. Enter a known batter capacity in Volume mode when you have it.
How Does Pan Size Affect Baking Time?
- A larger surface area can produce a shallower batter layer.
- Shallower layers can bake faster.
- Smaller or deeper pans can bake slower.
- Light metal, dark metal, glass, and ceramic heat and brown differently.
- Ovens vary. This calculator does not output exact minutes or adjust for pan material.
Start checking for doneness before the original recipe's minimum bake time when using a larger or shallower pan.
Worked cake pan conversion examples
Example 1 — 9×13 → 8×8
64 ÷ 117 = 0.547. So 2 cups → 1.09 cups.
Example 2 — 8" round → 9" round
63.6 ÷ 50.3 ≈ 1.26. Increase the recipe by about 26%.
Example 3 — 8×8 → 9" round
64 in² vs 63.6 in². At a common 2" depth these pans are nearly interchangeable.
Example 4 — 9×13 → two 9" rounds
117 in² vs about 127.2 in² total. The two layers will usually be slightly thinner.
Example 5 — Different depths
If an 8×8 is 2" deep and the target is 3" deep, Volume mode multiplies the 0.547 area factor by 3/2.
Example 6 — 9×5 loaf
A 9×5 loaf is 45 in² vs 117 in² for a 9×13. Capacity also depends on wall slope and brand. Prefer Volume mode or a measured cup capacity.
Related Baking Calculators
- After changing pan size, use the Recipe Scaler Calculator to adjust the recipe for a different number of servings.
- Convert cups, grams, and ounces with the Baking Conversion Calculator.
- Convert Fahrenheit, Celsius, and gas mark with the Oven Temperature Converter.