When to use this calculator
Scale a round-pan recipe to a rectangular pan by area. Assumes equal batter depth. Oven time, rise and heat transfer need separate judgement.
Explore the baking & dough calculators for other questions in this topic. For a related calculation, use the Salt Bakers Percentage Calculator: Calculate salt as a baker’s percentage of flour mass.
PUTTING IT INTO PRACTICE
Round to Rectangular Pan Recipe: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Original round pan diameter (cm) | 20 |
| New rectangular pan length (cm) | 20 |
| New rectangular pan width (cm) | 20 |
| Result | 1.27324 × |
- Check the input labels and enter the example values above.
- Apply the relationship: Ingredient multiplier = rectangular area/round-pan area.
- The result is 1.27324 ×, rounded for display.
How to interpret your result
Assumes equal batter depth. Oven time, rise and heat transfer need separate judgement.
Baker’s percentages use flour as their denominator. Include the flour and water already present in a starter when calculating a whole dough. Scaling a pan recipe by area assumes similar batter depth.
Frequently asked questions
Why can baker’s percentages total more than 100%?
Flour alone is defined as 100%. All other ingredient percentages are measured relative to that flour mass.
When is the round to rectangular pan recipe calculator useful?
Scale a round-pan recipe to a rectangular pan by area. Assumes equal batter depth. Oven time, rise and heat transfer need separate judgement.
How do I use the round to rectangular pan recipe calculator?
Enter original round pan diameter (cm), new rectangular pan length (cm), new rectangular pan width (cm). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Ingredient multiplier = rectangular area/round-pan area.
What should I check before using the result?
Assumes equal batter depth. Oven time, rise and heat transfer need separate judgement.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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