8×8 to 9×13 Pan Conversion: Scale Up by 1.828125
To move an 8×8-inch recipe into a 9×13-inch pan at the same batter depth, multiply every ingredient by 1.828125. The new pan has 117 square inches of area versus 64.
- 2 min read
- Updated 2026-10-22
Printable reference chart
Use your browser’s Print command to print this chart and your scaled ingredient list.
| Original amount | ×1.828125 amount |
|---|---|
| 100 g | 182.8125 g |
| 200 g | 365.625 g |
| 1 cup | 1.828125 cups |
| 2 tsp | 3.65625 tsp |
| 4 cups batter | 7.3125 cups batter |
This assumes comparable pan depth and measured inside dimensions.
Scale your ingredients
Paste your recipe into the scaler below, with one ingredient per line. The starting multiplier is 1.828125; change it if your recipe or pan ratio differs. This scales amounts in their original units, not baking times or ingredient densities.
Calculate the larger batch
Use 9 × 13 ÷ (8 × 8) = 117 ÷ 64 = 1.828125. Enter the original ingredients in the scaler above and review every result, including frosting or topping. Weights are easier to measure than awkward spoon fractions.
Why doubling is different
A double batch is 2 ÷ 1.828125, or about 9.4% more batter than this same-depth conversion needs. In one 9×13 pan it makes a deeper layer and may overflow a shallow pan. If doubling is easier, portion the surplus into another suitable baking pan rather than forcing it all into one dish.
Keep the depth familiar
A single unscaled batch spreads to about 54.7% of its original depth in the larger pan. Thin bars can finish sooner and dry out. With the 1.828125 batch, keep the original temperature as a starting point and check the center using the recipe’s doneness cues. Bake time does not increase by 82.8% automatically.
Frequently asked questions
Is an 8×8 recipe doubled for a 9×13 pan?
The same-depth factor is 1.828125, not 2.
What if I use the original batch?
It will be thinner, approximately 54.7% of the original depth for straight-sided pans.
Should I increase the temperature?
Do not increase it just because the batch is larger; start with the recipe’s setting.
Can I use 1.5 instead?
It gives about 17.9% less batter than the area-based target, so expect a slightly thinner result.