How It Works
The converter compares the volume of two pans. Volume determines how much batter fits, so the ratio between the two volumes gives you the recipe multiplier.
Formulas used (assuming a standard 2-inch pan height):
- Round pan: Volume = π × r² × 2, where r = diameter ÷ 2
- Square pan: Volume = side × side × 2
- Rectangular pan: Volume = length × width × 2
Divide the “to” pan volume by the “from” pan volume. If your new pan is 1.5× the volume, multiply every ingredient by 1.5.
Cake Pan Size Chart
Reference table comparing common pan sizes. All volumes assume a 2-inch pan height. The multiplier column shows how much to scale a recipe designed for a standard 9″ round pan.
| Pan | Dimensions | Area (in²) | Volume (in³) | vs 9″ Round |
|---|---|---|---|---|
| 6″ Round | 6″ diameter | 28.3 | 56.5 | 0.44× |
| 8″ Round | 8″ diameter | 50.3 | 100.5 | 0.79× |
| 9″ Round | 9″ diameter | 63.6 | 127.2 | 1.00× |
| 10″ Round | 10″ diameter | 78.5 | 157.1 | 1.23× |
| 12″ Round | 12″ diameter | 113.1 | 226.2 | 1.78× |
| 8″ Square | 8″ × 8″ | 64.0 | 128.0 | 1.01× |
| 9″ Square | 9″ × 9″ | 81.0 | 162.0 | 1.27× |
| 9×13″ Rectangular | 9″ × 13″ | 117.0 | 234.0 | 1.84× |
| 9×5″ Loaf | 9″ × 5″ | 45.0 | 90.0 | 0.71× |
| 10″ Bundt | 10″ diameter | 78.5 | 157.1 | 1.23× |
Baking Time Adjustments
A different pan size means a different batter depth. Thicker batter takes longer to bake through. Use this table as a starting point, then check with a toothpick.
| Size Change | Time Adjustment | Why |
|---|---|---|
| Much larger pan (1.3×+) | Add 5-10 minutes | More batter, deeper center |
| Slightly larger (1.1-1.3×) | Add ~5 minutes | Marginally thicker layer |
| Same size (±10%) | No change | Batter depth is similar |
| Slightly smaller (0.7-0.9×) | Reduce ~5 minutes | Thinner layer bakes faster |
| Much smaller (<0.7×) | Reduce 5-10 minutes | Significantly thinner batter |
Always set a timer for 5 minutes before the adjusted time and test with a toothpick. Ovens vary, and darker pans absorb more heat.
FAQ
Can I use a square pan instead of a round pan?
Yes. An 8″ square pan (64 in²) is almost identical in area to a 9″ round pan (63.6 in²). They're interchangeable for most recipes without any scaling.
Does pan material affect baking time?
Dark or non-stick pans absorb more heat and can bake 5-10 minutes faster than light aluminum pans. Glass pans also retain more heat. Reduce oven temperature by 25°F when using dark or glass pans.
What if my pan is deeper than 2 inches?
This calculator assumes a standard 2-inch height. If your pan is 3 inches deep, the volume is 50% larger. You can fit more batter, but baking time increases significantly. Add 15-25 minutes and cover with foil if the top browns too fast.
Can I split batter across two smaller pans?
Absolutely. Calculate the total volume of both smaller pans combined. If two 6″ rounds (56.5 in³ each = 113 in³ total) are close to one 9″ round (127.2 in³), you'll use most of the batter. Reduce baking time by 5-10 minutes since the layers are thinner.
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