Baking Pan Size Converter
Switching pan sizes changes the batter depth and baking time. This calculator finds the equivalent area of any pan so you can adjust quantities and timing correctly.
Pan Substitution Guide
Area is What Matters
When substituting pan sizes, match the base area as closely as possible. A 20cm round tin = 314 cm². A 18cm square tin = 324 cm² — very close, and a good substitute. An 8-inch (20cm) round = 314 cm² vs a 9-inch (23cm) = 415 cm² — these are not equivalent.
Batter Depth Affects Baking Time
More batter in a smaller pan = deeper cake = longer baking time. Less batter in a larger pan = shallower cake = shorter time. As a rule, reduce temperature by 10°C and check for doneness earlier when going up in pan size.
Tin Volume Guide (UK common)
20cm round: 314 cm² base. 23cm round: 415 cm². 18cm square: 324 cm². 20cm square: 400 cm². 900g loaf tin: approximately 900ml volume. For loaf tins, calculate volume (L×W×H) rather than base area.
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