Quick answer: Yes. Two 8×8 pans have a combined area of 128 sq in — about 9% more than a single 9×13 pan (117 sq in). Divide the batter evenly by weight, bake both pans on the same rack, and reduce time by about 5%. For a 35-minute recipe, start checking at 31–32 minutes.
This is one of the most useful pan swaps for bakers who want to bring a dish to two households, or simply don't own a 9×13 pan. The math works out surprisingly well — two 8×8 pans aren't a perfect match, but they're close enough that the difference is minor.
The math
9×13 pan area117 sq in
One 8×8 pan area64 sq in
Two 8×8 pans (combined)128 sq in
Difference+9% more area
Batter depth per 8×8~91% of 9×13 depth
Time adjustment (per pan)Reduce by ~5%
Because both 8×8 pans together have slightly more area than the 9×13, each individual pan holds less batter than the 9×13 would. The batter in each pan is about 9% shallower — nearly the same, with only a small time reduction needed.
Prepare the recipe as normal — mix the batter completely in a large bowl or the recipe's specified vessel.
Weigh the total batter using a kitchen scale. Divide by 2 to get the target weight per pan.
Pour half the batter into each 8×8 pan. Use the scale to confirm each pan has an equal amount.
No kitchen scale? Use a large measuring cup and count equal scoops or pours alternating between the two pans.
Place both pans on the same oven rack, at least 1 inch apart and 1 inch from the oven walls.
Rotate both pans 180° front-to-back at the halfway point for even browning.
Check for doneness a few minutes before the adjusted time using the toothpick test in the center of each pan.
Baking time adjustments by recipe
Recipe (9×13 time)
Two 8×8 time
Difference
Notes
Brownies — 30 min
~28–29 min
−1–2 min
Toothpick should have moist crumbs
Sheet cake — 32 min common
~30 min
−2 min
Check with toothpick at 28 min
Lasagna / casserole — 45 min common
~43 min
−2 min
Check internal temp; must reach 165°F
Bar cookies — 25 min
~24 min
−1 min
Watch edges for color
Coffee cake — 40 min
~38 min
−2 min
Toothpick clean in thickest part
Fruit crisp / crumble — 50 min
~47 min
−3 min
Topping golden, fruit bubbling at edges
When this works well vs. when it doesn't
✓
Works great: bars & brownies
Dense batters are forgiving. Splitting brownies or lemon bars into two 8×8 pans works almost perfectly — and gives you two separate pans to share.
✓
Works great: casseroles
Lasagna, enchiladas, and other casseroles split beautifully. One pan for now, one for the freezer — layer each the same way.
△
Use caution: sheet cakes
Sheet cakes cut from a 9×13 give rectangular slices. Two 8×8 pans give you two separate cakes — fine for flavor, but different for presentation.
✗
Avoid: presentations that need one piece
Recipes with elaborate top decoration, layered visual presentations, or poke cakes work best in the single pan specified. The visual effect won't transfer well to two smaller pans.
Tips for a great result
⚖️
Weigh the batter — don't eyeball
Equal batter depth means equal baking time. Uneven splits mean one pan will be done before the other. A kitchen scale removes the guesswork.
🔄
Rotate halfway through
Hot spots in ovens are real. Rotating both pans 180° at the halfway mark prevents one side of each pan from browning faster than the other.
🧊
Freeze one pan before baking
For casseroles: assemble both pans, cover one tightly with foil and freeze it unbaked. When ready to bake, thaw overnight in the fridge and add 10–15 minutes to the bake time.
📏
Watch the fill level
Each 8×8 pan should be about 55% full when you split a 9×13 recipe. If the batter nearly fills a 9×13, each 8×8 may only be about 55% full — which is fine.
Yes. Two 8×8 pans give you 128 square inches of total baking area versus 117 for a 9×13. Divide the batter evenly by weight, bake both pans on the same rack, and reduce the baking time by about 5%. The result will be nearly identical in texture.
Weigh the batter on a kitchen scale and divide by 2. Without a scale, use a large measuring cup and alternate equal scoops between pans. Uneven splits will cause one pan to finish before the other.
Yes — place both pans on the same oven rack side by side with at least 1 inch of clearance between them and the oven walls. They should finish at the same time since they contain equal amounts of batter at the same depth. Rotate both pans front-to-back at the halfway point.
Reduce by about 5% — roughly 1–3 minutes depending on the original time. The batter depth per 8×8 pan is about 9% shallower than in a 9×13, so the difference is small. Start checking for doneness 3–4 minutes before the original recipe time.
Bake in two batches. Pour half the batter into the pan and bake. Cover and refrigerate the remaining batter. Let it sit at room temperature for 15 minutes before baking the second batch. The refrigerated batter may need an extra 1–2 minutes of bake time since it starts cooler.
Calculate any pan substitution
Enter any two pan sizes and get an exact adjusted time, temperature guidance, and a side-by-side visual comparison drawn to scale.