9×13 Pan to 13×18 Half-Sheet Pan: Multiply Recipe by 2×
Multiply every recipe ingredient by 2× when converting 9×13-inch Quarter-Sheet / Baking Pan to 13×18-inch Half-Sheet Pan (1" rim) (14 cups vs. 15 cups capacity). Increase or keep 350°F–375°F for thin sheet sponge/bars. Reduce bake time by 30%–45% (typically 12–20 minutes total).
Pan note (2×): Multiply all recipe ingredients by 2.00× (surface-area ratio). Double the surface area of a 9×13 pan; check slab bars and sheet cakes 8–12 minutes early.
Supports fractions (2 1/2 cups, ¾ cup), metric weights (200g), US butter sticks, and packing notes (packed, sifted, scooped).
Converted Mixing-Bowl Checklist (2×)
Estimated matched ingredient weight: 1809.1 g (3.99 lb)
| ✓ | Ingredient | Scale Weight | Cup / Spoon Measure |
|---|---|---|---|
All-Purpose FlourInput: 2 1/4 cups all-purpose flour • spooned & leveled | 540 g (19.05 oz) | 4 ½ cups | |
Unsalted ButterInput: 1 stick unsalted butter • packed into cup / 2 sticks | 227 g (8.01 oz) | 1 cup | |
Light Brown SugarInput: 3/4 cup light brown sugar, packed • firmly packed | 300 g (10.58 oz) | 1 ½ cups | |
Granulated White SugarInput: 1/2 cup granulated sugar • poured or spooned & leveled | 200 g (7.05 oz) | 1 cup | |
2 large eggs | 4 × | 4 large eggs | |
Pure Vanilla ExtractInput: 2 tsp vanilla extract • Poured liquid | 17.3 g (0.61 oz) | 1 tbsp + 1 tsp | |
Baking Soda / Sodium BicarbonateInput: 1 tsp baking soda • Dip and sweep | 9.2 g (0.32 oz) | 2 tsp | |
Diamond Crystal Kosher SaltInput: 1 tsp diamond crystal kosher salt • Pour and level | 5.6 g (0.2 oz) | 2 tsp | |
Semisweet Chocolate ChipsInput: 1 1/2 cups semisweet chocolate chips • Dip and sweep | 510 g (17.99 oz) | 3 cups |
Original vs. Target Pan Dimensions
| Pan | Dimensions | Surface Area | Rim-Full Capacity |
|---|---|---|---|
| 9×13-inch Quarter-Sheet / Baking Pan | 9" × 13" × 2" H | 117 sq in | 14 cups |
| 13×18-inch Half-Sheet Pan (1" rim) | 13" × 18" × 1" H | 234 sq in | 15 cups |
Batter depth rule: Fill cake, brownie, and quick-bread pans between ½ and ⅔ full so batter rises evenly without doming. For dark nonstick or glass bakeware, reduce oven temperature by 25°F (15°C).
Frequently Asked Questions
What is the exact multiplier to convert 9×13-inch Quarter-Sheet / Baking Pan to 13×18-inch Half-Sheet Pan (1" rim)? ▾
Multiply every recipe ingredient by 2× (computed via pan surface area: 234 sq in ÷ 117 sq in).
Do I need to change oven temperature or bake time for 9×13 Pan to 13×18 Half-Sheet Pan? ▾
Increase or keep 350°F–375°F for thin sheet sponge/bars. Reduce bake time by 30%–45% (typically 12–20 minutes total). Always fill cake and quick-bread pans between ½ and ⅔ full so batter rises evenly without overflowing.