Baking Pan Converter
Convert recipes between different baking pan sizes. When you need to use a different pan than the recipe calls for, this calculator tells you how to adjust ingredient amounts and baking time based on pan area.
Reviewed by the SparkCalc editorial team
How We Calculate This
Round pan area = π × (diameter/2)². Square pan area = side². Rectangular area = width × length. Multiplier = target area / original area. Adjust baking time inversely with batter depth.
Sources: NIST Office of Weights and Measures — Metric Kitchen: Cooking Measurement Equivalencies · NIST Office of Weights and Measures — Metric Kitchen: Culinary Measurement Tips
Frequently Asked Questions
How do I adjust baking time for different pan sizes?
Smaller/deeper pans need longer baking time at lower temperatures. Larger/shallower pans need shorter time. Generally, adjust by 10-15% and check for doneness early.
Can I use two smaller pans instead of one large one?
Yes! Divide the batter between pans. Two 8" rounds have almost the same area as one 9×13" rectangular. Reduce baking time by about 25% for thinner layers.
What if my pan is a different depth?
Standard pans are 2" deep. If using deeper pans, the batter will be thicker and need longer baking at a slightly lower temperature. Shallower pans bake faster.
How do I know if a pan substitution will work?
Keep total pan area within 10% for best results. Fill pans 1/2 to 2/3 full. If a recipe calls for 9" and you use 8", expect a taller, moister cake that needs more time.
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