Baking Pan Size Conversion Chart: Oven Temperatures and Cook Times for Every Recipe
How to Convert Baking Pan Sizes (Without Ruining the Bake)
Converting a pan recipe isn't about guessing — it's about comparing the volume of the pans, not just the width and length. A 9×13 pan holds roughly 15 cups of liquid, while an 9×9-inch square holds about 10 cups, so switching between them means scaling the batter by roughly 1.44, not 1.0. Here's the math that actually matters, and how to adjust temperature and time when you do switch.
The Standard Pan Conversion Chart
The chart below uses the pan's full capacity and the typical fill level of two-thirds — the rule of thumb that keeps batter from rising over the rim. "Multiplier" tells you how much to increase or decrease a recipe when you move from the base pan to the destination pan.
| Pan | Dimensions | Total capacity | Typical batter fill | Multiplier (from 9×9) |
|---|---|---|---|---|
| 8×8-inch square | 8×8×2 in | 8 cups | 5 cups | 0.79 |
| 9×9-inch square | 9×9×2 in | 10 cups | 6–7 cups | 1.00 |
| 9×13-inch rectangle | 9×13×2 in | 15 cups | 10 cups | 1.44 |
| 8-inch round | 8×2 in | 6 cups | 4 cups | 0.79 |
| 9-inch round | 9×2 in | 8 cups | 5–6 cups | 1.00 |
| 9×5-inch loaf | 9×5×2.5 in | 8 cups | 5–6 cups | 1.00 |
| 12-inch quarter sheet | 12×8×1 in | 13 cups | 8 cups | 1.75 |
| Half sheet | 18×13×1 in | 26 cups | 17 cups | 3.50 |
| 12-cup muffin tin | 12 wells, 2/3 oz each | 4 cups | ¼–⅓ cup per well | — |
| 9-inch tart pan | 9×1 in | 3 cups | 3 cups | 0.50 |
Volume Multipliers to Memorize
These ratios come from dividing the pan areas, and they're the ones you'll use most often:
- 9×9 square → 9×13 rectangle: multiply by 1.44 (round to 1.5). This is the single most common conversion in home baking — it's how you turn a brownie recipe into a full tray of brownies.
- 8×8 square → 9×9 square: multiply by 1.27 (about 1.25). Two 8×8 pans roughly equal one 9×13 pan.
- 9-inch round → 9×13 rectangle: multiply by 1.84 (about 2). Two 9-inch round layers will fill a 9×13 pan nicely.
- 8-inch round → 9-inch round: multiply by 1.27. Going up one round size means about 25% more batter.
- Loaf pan ↔ 9×13: a standard 9×5 loaf holds about 8 cups; a 9×13 holds 15 cups, so a loaf recipe is roughly half a 9×13 recipe — or use two loaf pans for the full 9×13 quantity.
Oven Temperatures and Cook Times
Once you've converted the volume, the biggest risk is that a shallower, wider pan bakes faster than a deeper one. Use these starting points, then rely on visual and internal cues:
- 9×13 sheet cake at 350°F (175°C): 25–35 minutes for a yellow or white cake; 35–45 minutes for a denser butter cake. A toothpick should come out with just a few moist crumbs.
- Round layer cake, 8 or 9 inch, at 350°F: 25–35 minutes. Deep 2-inch layers take closer to 35; shallow layers may be done at 25.
- Loaf cakes and quick breads at 350°F: 50–65 minutes. A 9×5 banana bread usually needs 55–65 minutes, while a 9×6 pan finishes 8–12 minutes sooner. Tent with foil after 40 minutes if the top browns too fast.
- Brownies and blondies at 350°F: 25–35 minutes in an 8×8, 35–40 minutes in a 9×13. Pull them when the edges are set and the center still has a slight jiggle.
- Muffins at 375–400°F (190–200°C): 18–25 minutes. Starting at 400°F helps the muffins dome; drop to 350°F for the second half if they brown too quickly.
- Bars and cookie sheets at 350°F: 12–25 minutes depending on thickness — fudgy blondies take longer than thin shortbread bars.
- Pound cake at 325°F (165°C): 60–75 minutes in a loaf pan, 55–65 minutes in a 9×13 because the batter spreads and bakes faster.
- Deep-dish pies at 425°F (220°C): 40–55 minutes for fruit pies; cream pies bake the crust only, usually 12–18 minutes at 425°F.
Pan Material Changes Everything
Dark nonstick and glass pans absorb and radiate heat differently than light, shiny aluminum. Dark pans brown edges faster, so drop the oven temperature by 25°F and start checking doneness 5–10 minutes earlier. Glass (like Pyrex) holds heat longer, so bake at 25°F lower and expect roughly 10 extra minutes — glass is prone to over-browning on the sides even when the center is still raw. Heavy-golden anodized pans fall between the two and usually need no adjustment.
When You Can't Scale Cleanly
Liquid volume scales perfectly, but eggs, baking powder, and vanilla don't always scale in tidy fractions. For most recipes, round egg counts to the nearest whole egg and adjust with a tablespoon of extra liquid or milk if the batter looks stiff. For baking powder, most bakers round to the nearest ½ teaspoon — using too much in a halved recipe causes a soapy aftertaste and a collapsed texture. When in doubt, weigh your ingredients instead of measuring by volume, since 1 cup of flour can range from 4¼ to 5¾ ounces depending on how it's scooped.
Altitude Adjustments
Above 3,000 feet, leavening expands more and moisture evaporates faster. For every 1,000 feet above 3,000, reduce sugar by 1–2 tablespoons per cup and liquid by 2–4 tablespoons per cup, and add 1–2 tablespoons of flour per cup of flour called for. Raise the oven temperature by 15–25°F to set the structure before the cake over-rises, then reduce it for the final 10 minutes so the top doesn't crack.
Frequently Asked Questions
Q: How do I convert a 9×13 recipe to a 9×9 pan? A: Reduce the batter by about 30% — multiply every ingredient by 0.71 (or roughly two-thirds for most things). The 9×9 pan will take 5–8 minutes longer than the 9×13 version because the batter is deeper, so check it at 30 minutes and keep testing until a toothpick comes out clean.
Q: Do I change the oven temperature when I change pans? A: Only if the pan material changes. Switching from shiny aluminum to dark nonstick or glass means dropping the temperature 25°F; switching between two aluminum pans of different sizes needs no temperature change, just a 5–10 minute time check. Always use an oven thermometer to confirm the actual temperature — most ovens run 15–25°F off their dial setting.
Q: Why did my cake sink in the middle after I switched to a larger pan? A: The batter was too thin for the pan, so the sides set before the center finished rising. Fix it by increasing the leavening by no more than ¼ teaspoon per cup of batter, adding an extra egg white for structure, and filling the pan to two-thirds capacity rather than a quarter full. A thinner batter also bakes at a higher temperature to set the edges faster — try 375°F for the first 10 minutes, then reduce to 350°F.