Quick answer: Yes — but adjust your baking time. An 8×8 pan has 64 sq in of area versus 81 sq in for a 9×9. The 8×8 is 79% the size, so batter sits deeper and needs about 15–20% less time. For a 35-minute recipe, start checking at 28–30 minutes.
The 8×8 and 9×9 are the two most commonly confused pans in home baking. They look similar, and many kitchens have one but not the other. The good news: this is one of the safer pan swaps you can make. The math is simple, and both pans work well for the same range of recipes.
Using the baking formula (adjusted time = original × scale_factor0.7, where scale_factor = 0.79):
Recipe time (9×9)
Adjusted time (8×8)
Difference
Best for
20 min
~17 min
−3 min
Shortbread, thin bars
25 min
~21 min
−4 min
Blondies, bar cookies
30 min
~25 min common
−5 min
Brownies, fudge bars
35 min
~29 min common
−6 min
Layer cake, coffee cake
40 min
~33 min
−7 min
Cakey brownies, dense bars
45 min
~37 min
−8 min
Fruit crumble, cobblers
55 min
~46 min
−9 min
Dense fruit cakes
Going the other way: 9×9 instead of 8×8
If your recipe calls for an 8×8 and you only have a 9×9, the batter spreads thinner. Increase baking time by about 15% and watch the edges, which will set faster in the wider pan.
Recipe time (8×8)
Adjusted time (9×9)
Notes
25 min
~28 min
Watch edges from 20 min
30 min
~35 min common
Check center at 30 min
35 min
~41 min
Tent with foil if edges brown first
40 min
~47 min
Reduce temp by 25°F if browning too fast
Does the swap work for every recipe?
It works best for these types:
🍫
Brownies — great swap
The 8×8 makes thicker, fudgier brownies. Many bakers consider this an improvement. Dense batters are the most forgiving of pan size changes.
🍰
Bar cookies — good swap
Lemon bars, magic bars, shortbread — all work well. The 8×8 version will just be taller and need a bit more time. Watch the center for set.
🎂
Layer cake — use caution
Delicate cakes are more sensitive. The extra depth can cause the center to stay underdone if you pull the pan at the original time. Use the toothpick test.
🥧
Cheesecake — not ideal
Cheesecakes are the most sensitive to pan dimension changes. Stick to the specified pan size, or use a springform of equivalent diameter.
Tips for a successful swap
⏱
Check early, don't just trust the timer
Oven temperatures vary. Start checking for doneness 5 minutes before the adjusted time using the toothpick test.
📏
Don't overfill the 8×8
If the original recipe just barely fits a 9×9, the 8×8 will be over-full. Fill no more than ⅔ full — bake any extra batter in a small ramekin.
🧈
Grease the corners well
Square corners concentrate heat. Grease them well and line with parchment if cutting clean squares is important for presentation.
🪟
Glass pan? Lower the temp
If swapping material (glass vs metal) in addition to size, lower the oven temperature by 25°F. Glass retains more heat and can over-brown the bottom.
Yes. The 8×8 has 64 square inches of area versus 81 for a 9×9 — it's 79% the size. Your batter will be deeper, and you'll need to reduce the baking time by about 15–20%. For most recipes, use the adjusted time from the chart above and start checking for doneness 5 minutes early.
Multiply the original time by approximately 0.83. For a 30-minute recipe, that's about 25 minutes. For 40 minutes, about 33 minutes. This formula (original time × scale_factor^0.7) is more accurate than a flat percentage reduction.
Yes, and many bakers prefer the 8×8 result. The deeper batter produces thicker, fudgier brownies with a chewier center. The 9×9 version bakes thinner — slightly crispier edges and a less dense center. Neither is wrong; it depends on your preference.
Yes. The 9×9 is 27% larger, so batter spreads thinner and bakes faster. Increase baking time by about 15% (so a 30-minute recipe becomes about 35 minutes) and watch the edges, which will set before the center.
Yes. Glass pans heat more slowly but retain heat longer, which can cause over-browning at the bottom and sides. If you're swapping from a metal 9×9 to a glass 8×8 (or any glass pan), reduce the oven temperature by 25°F and extend the baking time slightly. The time chart above assumes like-for-like material.
Try any pan swap in seconds
Enter any two pan sizes — rectangular, square, or round — and get an exact adjusted time, temperature guidance, and a visual size comparison.