Baking pan capacity calculator
Estimate full water capacity from inside dimensions for a straight-sided round or rectangular pan.
How to use the result
Rectangular volume = inside length × inside width × vertical depth. Round volume = π × (inside diameter ÷ 2)² × vertical depth. With dimensions in inches: one US liquid quart = 57.75 cubic inches; four US cups = one quart. Convert inch dimensions to centimeters using 2.54 cm per inch; a cubic centimeter is a milliliter. Results round only for display.
Worked example
An ideal straight-sided 8 × 8 × 2 inch rectangular pan holds 128 cubic inches ≈ 8.87 US cups ≈ 2.22 US liquid quarts ≈ 2.10 L to the brim.
Before changing the recipe
This estimates ideal shapes with vertical walls. Rounded corners, tapered sides, fluting, a central tube, and the difference between nominal and measured dimensions change actual capacity. Verify those pans with measured water or the manufacturer. Full capacity is not a batter fill line. The tool does not recommend how much batter to use, certify overflow clearance, or predict baking time. US liquid cups and quarts are used, not Imperial units or a recipe’s rounded 240 mL cup.
US gallon definition: NIST: 231 cubic inches per US liquid gallon. A quart is one quarter of that volume.
Reference: NIST: household capacity relationships · Accessed October 6, 2026.
Calculation tool · Editorial review pending