Cake Pan Converter
A 9 inch round holds 8 cups. A 9x13 holds about 14½. Pick the pan the recipe wants and the pan you own, and see whether the batter fits before you pour it.
Holds 8 cups of batter
Holds 14.5 cups of batter
How this is calculated
Only one number matters when you swap pans, and it is not the diameter. It is volume: how many cups of batter the pan holds. Two pans that sound completely different can be interchangeable, and two that sound similar often are not.
The classic example is at the top of the chart below. An 8 inch square and a 9 inch round both hold about 8 cups, so they swap one for one with no changes at all. An 8 inch round holds 6 cups, so it is a quarter smaller than the 9 inch round it sits next to in the cupboard. Nothing about the names tells you that.
The percentage at the top is simply your pan's capacity divided by the recipe's pan capacity. If your pan holds 75% as much, use three quarters of the batter. If it holds 180% as much, you can make roughly 1¾ times the recipe, or use the full recipe and accept a shallower cake that bakes faster.
Where the capacities come from. They are the volume of water each pan holds when filled to just below the rim, as published in the standard pan charts that manufacturers and test kitchens use. They come out a little under the raw geometric volume of the dimensions because real pans have sloped sides and a rolled rim. Sources vary by roughly half a cup on the larger pans, so treat these as good working figures rather than laboratory constants, and measure your own pan with water if a swap looks marginal.
Rule Never fill a cake pan more than two thirds
Batter expands as the leavening works and the air bubbles heat. A pan filled to three quarters will crown, crack across the top, or run down the outside and burn onto the oven floor. Two thirds is the ceiling for anything with baking powder or soda in it, and about half is where a normal layer cake actually sits.
That single rule is why a smaller pan is more dangerous than a bigger one. A pan that is too big gives you a thin, quick baking, slightly dry cake. A pan that is too small gives you a mess in the bottom of the oven and a raw center.
Cake pan sizes and how much they hold
Every pan in the converter, in cups of batter, sorted by size. This is the chart to screenshot.
| Pan | Holds | Floor area | Swaps with |
|---|
Cupcake and muffin pans are listed by the total the whole tray holds. Bundt and tube pans are sold by their stated cup capacity, which is why theirs is the most reliable figure on the chart.
What a pan swap does to the bake time
Bake time follows the depth of the batter, not the size of the pan and not the quantity of batter. Spread the same batter over a wider floor and it gets shallower, so heat reaches the middle sooner and it is done earlier. Pour it into a narrower pan and it gets deeper, so the outside sets long before the middle does.
| The batter ends up | Time | Oven |
|---|---|---|
| Much shallower (half the depth or less) | Considerably shorter, sometimes 30 to 40% less | Keep the same. The risk is overbaking, not underbaking |
| A little shallower | Start checking 5 to 10 minutes early | Keep the same |
| About the same | Roughly as written | Keep the same |
| A little deeper | Longer, often 10 to 20% more | Drop 25 °F so the outside does not set first |
| Much deeper (half again or more) | Much longer, and hard to judge | Drop 25 °F and consider splitting between two pans instead |
Put both pans into the baking time adjuster for an actual revised time window in minutes. Whatever it says, the skewer beats the clock: a cake is done when a skewer comes out with a few moist crumbs and the middle springs back, and no timer knows that.
Turning a cake recipe into cupcakes
A standard cupcake well holds a shade under half a cup to the brim, and you fill it about two thirds, which works out at 1/4 cup of batter per cupcake, or 4 tablespoons. That single figure converts any cake recipe.
| Recipe made for | Batter | Standard | Jumbo | Mini |
|---|
Bake times for cupcakes are much shorter than for the cake they came from, because the batter is shallow and the pan is metal on every side. At the recipe's own temperature, expect roughly 18 to 22 minutes for standard cupcakes, 22 to 28 for jumbo, and 10 to 13 for mini. Start checking at the low end of the range the first time.
Cupcakes also change the frosting math, because a cupcake carries far more frosting per unit of cake than a layer does. Work out the batch size with the frosting calculator once you know your count, and check what the cake would otherwise have served with the cake serving chart.
The swaps people ask about most
| Recipe wants | You have | Verdict |
|---|---|---|
| 9 inch round (8 cups) | 8 inch square (8 cups) | Straight swap. No changes at all |
| 8 inch square (8 cups) | 9 inch round (8 cups) | Straight swap, the classic one |
| 9 inch round (8 cups) | 8 inch round (6 cups) | Only 75% of the volume. Use three quarters of the batter or make a few cupcakes with the rest |
| 8 inch round (6 cups) | 9 inch round (8 cups) | Fits easily, but shallower. Start checking 5 to 10 minutes early |
| 9 x 13 (14.5 cups) | Two 9 inch rounds (16 cups) | Works well. This is how a sheet recipe becomes a layer cake |
| 9 x 13 (14.5 cups) | One 9 inch round (8 cups) | Only 55%. Do not try it, you will lose the batter over the side |
| Two 9 inch rounds (16 cups) | 9 x 13 (14.5 cups) | Close, at 91%. Hold back about a cup of batter and bake it as cupcakes |
| 10 cup bundt (10 cups) | 9 x 5 loaf (8 cups) | 80%. Use four fifths of the batter, and expect a longer bake with no hole in the middle to help |
| 9 x 5 loaf (8 cups) | 8.5 x 4.5 loaf (6 cups) | 75%. The smaller loaf pan is genuinely smaller. Hold back a quarter or it will dome and split |
| 9 inch springform (12 cups) | 9 inch round (8 cups) | Only 67%, and a cheesecake cannot be unmolded from a solid pan anyway. Line it and lift it out, or use less batter |
Where volume alone is not the whole answer
1 Ring pans cheat
A bundt or angel food pan has a hole up the middle, so heat reaches the batter from the inside as well as the outside. It bakes faster than its volume or its depth would suggest, and it can carry a deeper batter than a solid pan of the same capacity. Going the other way, moving a bundt recipe into a solid loaf or round pan, is the risky direction: the same batter now has no inner wall and the center takes noticeably longer.
2 The pan's material changes the result more than its shape
Dark, nonstick and glass pans all run hotter at the edges than shiny aluminum. If you are swapping a light metal pan for glass or dark metal, drop the oven 25 °F on top of anything the volume math tells you, and start checking early. This is a real effect and it is bigger than most pan swaps.
3 Some recipes are about the shape, not the volume
Angel food and chiffon cakes climb the ungreased sides of a tube pan, so they will not work in anything else. Cheesecakes need a springform because they cannot be turned out. Anything baked in a water bath needs a pan that fits inside a larger one. When the pan is doing structural work, the capacity chart cannot help you, and the honest answer is to use the pan the recipe asks for.
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Questions bakers actually ask
How many cups does a 9 inch round pan hold?
A standard 9 inch round pan that is 2 inches deep holds about 8 cups of batter filled to just under the rim. In practice you would put 4 to 5 cups in it for a normal layer, because a cake pan should not go past two thirds full.
For comparison, an 8 inch round holds about 6 cups and a 10 inch round holds about 10 and a half. That means going up one nominal inch adds roughly a third more volume, which is far more than the name suggests.
Can I use a 9x13 pan instead of two 9 inch rounds?
Almost. Two 9 inch rounds hold 16 cups between them and a 9x13 holds about 14 and a half, so the 9x13 is at about 91% of the pair. Hold back roughly a cup of batter, bake it as four or five cupcakes alongside, and the sheet will be fine.
Going the other way is straightforward: a 9x13 recipe divides comfortably between two 9 inch rounds with room to spare, which is the usual way a sheet cake recipe gets turned into a layer cake.
What can I use instead of an 8 inch square pan?
A 9 inch round. Both hold about 8 cups, so it is a straight one for one swap with no change to the quantity, the temperature or the time. This is the single most useful pan equivalence in baking and it is worth remembering.
A 9 inch square is not an equivalent: it holds about 10 cups, a quarter more, and the same batter will come out noticeably thinner and bake faster.
My pan is smaller than the recipe wants. What do I do?
Use less batter, in the proportion the converter gives you, and bake the rest as cupcakes. Do not try to squeeze it all in. A pan filled past two thirds will rise over the edge, and what makes it onto the oven floor is the least of it: the cake that stays behind bakes unevenly with a sunken, undercooked middle.
If the shortfall is small, under about 10%, you can usually just accept a slightly taller cake and add five minutes. Beyond that, hold batter back.
Do I need to change the oven temperature when I change pans?
Only when the batter gets deeper. Deeper batter needs longer in the oven, and if you leave the temperature alone the outside dries out and the edges darken while the middle is still liquid. Dropping the oven by 25 °F and baking longer solves it.
Shallower batter needs no temperature change, just less time. The separate rule that does need attention is the pan material: dark, nonstick and glass pans all run hotter, so those get the 25 degree drop regardless of the volume math.
How many cupcakes does a cake recipe make?
Count on 1/4 cup of batter per standard cupcake. A recipe written for one 9 inch round makes about 16, a recipe for two 9 inch rounds makes about 32, and a 9x13 recipe makes about 28 to 30. Jumbo cupcakes take twice the batter and minis take about a tablespoon each.
The converter works this out from your chosen pan and fill level. Bake standard cupcakes for 18 to 22 minutes at the recipe's own temperature, and check with a skewer rather than trusting the number.
Is a springform pan the same size as a regular cake pan?
The diameter matches but the volume does not, because springform pans are taller. A 9 inch springform is usually about 2¾ inches deep and holds around 12 cups, against 8 cups for a 9 inch cake pan that is 2 inches deep. That is 50% more.
So a cheesecake recipe written for a 9 inch springform will not fit a 9 inch cake pan, and a layer cake baked in a springform will look strangely shallow. Check the depth of your pan, not just the number stamped on the bottom.
How do I measure my own pan's capacity?
Put the empty pan on the counter and fill it with water from a measuring cup, counting the cups, until the water is about a quarter inch below the rim. That is your capacity, and it beats every chart because it is your actual pan.
Measure the dimensions across the top inside edge, not the base and not the outside. Pans are named by their top interior measurement, and a pan measured across the bottom will read half an inch small on a pan with sloped sides.
Capacities are published pan chart figures for pans filled to just under the rim. Sources differ by up to half a cup on larger pans. Last reviewed August 2026.