Cake Pan Size Calculator
Convert cake batter volume between different pan sizes to adjust baking time and quantity.
Formula
Pans needed = original volume ÷ target pan volume
- Pan volumes are approximate at standard 2-inch batter depth.
- Adjust baking time: smaller pans bake faster; larger pans bake longer.
- Fill pans 2/3 full to allow for rise.
Two 9-inch rounds → 13×9 rectangle
Inputs
- Original Pan: round9
- Target Pan: rect13x9
- Number of Original Pans: 2
2 rounds × 8 cups = 16 cups. Rect = 14 cups. 16/14 ≈ 1.1 pans → use one 13×9 (slightly fuller).
Frequently asked questions
Can I substitute pan sizes?
Yes — just match the total volume. A 9-inch round and 8-inch square hold similar amounts.
How do I adjust bake time?
Larger, shallower pans bake faster; deeper pans need more time. Reduce temp by 25°F for deeper pans.
What if pans are different shapes?
Volume is what matters, not shape. As long as total volume matches, the batter will be the same amount.
Should I fill a pan all the way?
Fill 2/3 full max — cake batter rises and may overflow a full pan.