
Baking pan sizes are often a source of confusion for home bakers. While there are standard pan sizes, such as Bundt pans, loaf pans, and round cake pans, the measurements can vary slightly between manufacturers. For example, a 13x9-inch cake pan and a 9x13-inch cake pan are the same thing, but the depth may differ. To determine if your pan is 13x9 inches, measure from one inside corner of the pan to the opposite corner on the same side. This will give you the correct dimensions. If you need to substitute a different-sized pan in a recipe, you can use a conversion chart or calculate the volume of your pan by filling it with water one cup at a time. However, keep in mind that scaling a recipe up or down requires precision in baking, as it relies on chemical reactions and exact measurements.
| Characteristics | Values |
|---|---|
| Pan size | 13x9 inches |
| Pan type | Rectangular |
| Square inches | 117 |
| Capacity | 14 cups or 3.3 litres |
| Depth | 2.5 inches |
| Pan substitution | Two 8" pans or one 9x13" pan |
| Recipe adjustment | Multiply each ingredient by 1.44 or 1.5 |
| Baking time | Same as the original, increase as needed |
| Pan volume calculation | Fill the pan with water in cups, measure |
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What You'll Learn

Measure the pan yourself using a ruler or tape measure
If you want to know whether your pan is 13x9 inches, you can measure it yourself using a ruler or a tape measure. First, make sure you are measuring the top of the pan from the inner rim to the inner rim. Then, place the ruler or tape measure on the inner rim of one of the longer sides of the pan and measure across to the inner rim on the opposite side. This will give you the length of the pan. Repeat this process with the inner rims of the shorter sides of the pan to get the width.
You can also find out the capacity of your pan by measuring its volume. To do this, pour water from a measuring cup into the pan until it is full. This will tell you how much liquid the pan can hold, which is its volume.
If you don't have access to a ruler or tape measure, you can also look at the bottom of the pan, as sometimes the capacity or dimensions are engraved or embossed there. You can also try searching for the manufacturer's website or looking up the product specifications on Amazon if it is a common pan.
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Look for the pan's measurements engraved on its bottom
If you're unsure about the size of your pan, the easiest way to check is to look at the bottom of the pan. Sometimes, the capacity or dimensions are engraved or embossed there. If you can't find any measurements at the bottom of the pan, you can try measuring the pan yourself. Use a ruler or tape measure to measure the inner rim of the pan. You can also measure the volume by pouring water from a measuring cup into the pan and counting until it's full.
- Round pans: 6×2 inches (15 x 5cm) = 4 cups (960ml)
- Round pans: 8×2 inches (20 x 5cm) = 6 cups (1.4 liters)
- Round pans: 9×2 inches (23 x 5cm) = 8 cups (1.9 liters)
- Square pans: 8×2 inch square (20 x 5 cm) = 8 cups (1.9 liters)
- Square pans: 9×2 inch square (23 x 5 cm) = 10 cups (2.4 liters)
- Rectangular pans: 11×7 inches (28 x 18 cm) = 10 cups (2.4 liters)
- Rectangular pans: 13×9 inches (33 x 23 cm) = 14 cups (3.3 liters)
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Calculate the pan's volume by filling it with water
To calculate the volume of a pan, you can use the formula V = l x w x h, where l is the length, w is the width, and h is the height of the pan. This formula assumes that the pan has a simple shape, like a square or rectangle.
However, if your pan has a more complicated shape, such as a Bundt pan or an oval pan, you can use the fluid displacement method to calculate its volume. Here's how you can do it:
Calculate Pan Volume by Filling it with Water:
- Fill the pan with water, using 1 cup of water at a time.
- Count the number of cups it takes to fill the pan completely.
- The total number of cups of water used is the volume of your pan.
This method is especially useful for pans with irregular shapes, such as Bundt pans or shaped cake pans. It provides a hands-on approach to determining the volume capacity of your pan without the need for complex mathematical calculations.
Additionally, if you have a digital kitchen scale, you can use it to measure the volume of water required to fill the pan. Here's how:
- Place your empty pan on the digital kitchen scale and tare it to zero.
- Fill the pan with water until it reaches the rim.
- Note the weight of the water, which will also give you the volume capacity in milliliters, as 1 milliliter of water weighs 1 gram.
- If you want to convert the volume from milliliters to cups, divide the total weight in grams by 237, as 1 cup is equal to 237 milliliters.
Remember, the volume capacity of a pan is important in baking as it helps determine the right amount of ingredients to use, ensures even cooking, and prevents overflow. While the above methods provide a simple way to calculate volume, it's always a good practice to fill pans only halfway to three-quarters full to allow room for the batter to rise during baking.
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Compare the pan's capacity with other common baking pans
A 13x9-inch pan has a capacity of 117 cubic inches. This is a relatively large pan, commonly used for sheet cakes, brownies, or bars.
Comparing this to other common baking pans, a 9x9-inch square pan has a capacity of 81 cubic inches, which is significantly smaller. An 8x8-inch square pan has a capacity of 64 cubic inches, and a 9-inch round pan has a similar capacity of 63.6 cubic inches (or 64 cubic inches, rounded up). These smaller pans are often used for brownies or single-layer cakes.
A 9x13-inch pan, with a capacity of 117 cubic inches, is a common alternative to the 13x9-inch pan. This larger pan is often used for sheet cakes or bars, and its capacity is almost double that of the 9x9-inch pan.
For round cake pans, a 9x2-inch pan can hold 8 cups of batter, which is typically filled halfway for a cake. This is equivalent to about 4 cups of batter for a single pan, or 12 cups total for two pans.
It's important to note that the depth of pans can vary, and this will affect the capacity and the amount of batter needed. The above calculations assume a standard depth for each type of pan, but it's always a good idea to measure the volume of your specific pan to ensure accuracy.
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Adjust the recipe to fit the pan by multiplying the ingredients
Adjusting a recipe to fit a different pan size requires some basic mathematics. The first step is to calculate the volume of the pan you want to use. This can be done by filling the pan with water, one cup at a time, and counting until it is full. Alternatively, you can calculate the volume by multiplying the area of the pan by its height.
Once you have the volume of your pan, you can calculate what is known as the 'conversion factor' or 'multiplying factor'. This is done by taking the desired volume (the volume of the new pan) and dividing it by the original volume (the volume of the old pan).
For example, if you want to convert a recipe from an 8-inch round pan to a 9-inch round pan, you would first calculate the volume of each pan. The volume of an 8-inch round pan is approximately 100.5 cubic inches (3.14 x 4 x 4 x 2), while the volume of a 9-inch round pan is approximately 127.2 cubic inches (3.14 x 4.5 x 4.5 x 2). The multiplying factor is then calculated as 127.2/100.5, which is approximately 1.26.
Finally, to adjust the recipe, multiply each ingredient quantity by the multiplying factor. In this example, you would increase all the ingredient quantities by 25% to get a 9-inch cake.
It is important to note that the baking time may need to be adjusted when using a different pan size. Bigger pans might take longer to bake, while smaller pans might take less time. Additionally, deep pan shapes, such as loaf pans, require a longer bake time than shallow pans, such as tart pans or jelly-roll pans. Always keep an eye on the oven and begin checking for doneness earlier than the recipe states.
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Frequently asked questions
You can use a ruler or tape measure to measure your pan from the inner rim to the inner rim.
You can pour water from a measuring cup into the pan to find out its volume.
Measure the length of your pan and the width. If the length is 13 inches and the width is 9 inches, your pan is 13x9.
You can use a larger pan, or set your pan on a rimmed baking sheet to catch any overflow. You can also substitute a different pan of the same capacity, but be mindful that the baking time may be affected.
Multiply the length of one side by the other side. For example, an 8x8 square pan is 64 square inches.


















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