*Sep 2020: I have updated the calculator to include the instructions on the fields to be filled in. Thanks Candice for the suggestion!*

**Recipe calls for a 9-inch cake pan and you've only got a 7-inch one? Want to bake brownies in a round pan instead of a square / rectangular one? Or want to bake a bigger cake for a party? **These are perhaps some of the common problems that we home bakers face because firstly, many of us cannot afford stocking up different shapes and sizes of baking tins and pans at home due to space and budget constraints. And secondly, there may be times when we want to bake a cake in a different size - a bigger cake for a party or just a mini cake for that someone special.

Scaling recipes **properly and accurately** is important because if you try to bake a 7-inch cake in a 9-inch cake pan and follow the baking times stipulated in the recipe, not only will you get a very thin and flat cake, you will also most likely end up with a burnt cake because the cake will be cooked for way too long. If you do it the other way round - baking a 9-inch cake in a 7-inch cake pan - there will too much batter and the baking times will be a lot longer than the one stipulated in the recipe and there is a risk that your cake batter will overflow, leaving a mess in the oven *horrors*.

For me, most of the times I need to scale down recipes because I'm baking only for 2 people these days - if I bake a full recipe, we will have trouble finishing all of the desserts (not to mention the disastrous effects on my waistline). But not to worry, this Cake Pan Conversions Calculator is here to help!

**The Formula**

The formula used is a very simple and straightforward one we all learned in school - volume. For round cake pans it's just *πr²h (π x square of radius x height)*, for square and rectangular cake pans it's *lbh (length x breadth x height)*. I only made it easier by combining everything in an Excel document so all we need to do is to 1) choose the type of pan you are converting from and converting to and 2) key in the cake pans' measurements.

The only key thing to note is to use the same type of measurements throughout - inches or centimetres. Do not mix them together otherwise the scale factor will not work.

**Scale Factor**

After entering the details, there will be a scale factor in the yellow box. This scale factor is the number to multiply your ingredients with. Take this scale factor for example (assuming I used inches for the cake pans dimensions):

So in order to convert a recipe for 9-inch cake pan to my 6-inch cake pan, I need to scale the ingredients down to 0.44. So the ingredients required for a 6-inch cake pan will be:

Ingredients |
Original Recipe |
Scaled Recipe(Multiply everything by 0.44) |

Plain flour Caster sugar Eggs |
200 grams 100 grams 4 eggs |
88 grams 44 grams 1.76 eggs |

**Approximation**

From the above, you will noted that the scaled recipe requires **1.76 eggs**, which is a very weird quantity of eggs. Unless all your ingredients are measured by weights, you will most likely end up with a weird quantity of eggs. So what I will do is to approximate - I will round up or down the ingredients so that I get something that is easier to work with - in this case I will most likely round up the quantities so that I use 2 eggs for this recipe:

Ingredients |
Original Recipe |
Scaled Recipe(Multiply everything by 0.44) |
Approximation Recipe |

Plain flour Caster sugar Eggs |
200 grams 100 grams 4 eggs |
88 grams 44 grams 1.76 eggs |
100 grams 50 grams 2 eggs |

**Special Cake Pans**

The formula will not work for chiffon pans, tube pans, bundt pans or springform pans. Chiffon pans, tube pans and bundt pans have a special design so the computation of its volume is not as straightforward as regular round, square or rectangular cake pans. For the conversion of these cake pans, it will perhaps be better to use the infographic from All Recipes.

For springform pans, the formula will work if you are scaling a recipe for springform pans with another springform pan (i.e. 9-inch springform pan recipe to a 7-inch springform pan). This is because springform pans usually hold more batter than regular cake pans (not sure why but apparently that's the case).

**And that's it!**

And that is how I scale most of the cake recipes I found on the internet! I've linked up to the calculator under the "Recipes" tab, so you can access it easily whenever you need to. If you would like to download this Excel file to keep it, you can grab it **here**. If you'd like to embed this on your site, you can find the script in the Excel file as well. And if you have further questions, drop them in the comments below and I hope I'll be able to answer them!

Have fun converting!

Louise Brady says

The calculation works well for ingredients but do you multiply the time for baking using the same calculation?

Jasline N. says

No the time shouldn't be multiplied.

Generally you should be able to follow the timing stipulated in the recipe but it is always a good practice start checking the baked goods earlier if this is the first time multiplying the recipe. This actually applies to all recipes that you are making for the first time 🙂

Geeta Punjwani says

Hi..I want to convert 7 inch cake recipe to 8 inch recipe,how should I convert baking powder,please guide me…Thanks in advance

Jasline N. says

Hi Geeta, do follow the instructions stated in the post. For baking powder, as the quantity used is very little, you can use the same amount or just increase it by a pinch. Should not have significant differences as you are scaling only from 7 inch to 8 inch.

Either says

Hi Jasline, I love your conversion calculator here, I found it very useful. However, I recently bought a heart shape silicone mould, so just wonder how to calculate from a 7in square tin recipe to a heart shape one (23cm the widest point), I know it is less straight forward, but any advice for that, please? Thanks in advance. 😉

Jasline N. says

Hi Either, sorry for the late reply. I can think of 2 ways.

One is if you can find out the volume of the heart shape tin, then compare it against the volume of the 7 inch square tin, then scale the recipe accordingly.

Second is try baking the cake for the 7 inch square tin into the heart shape mould. If the batter fills up to 3/4 of the height of the heart shape mould, then you can stick to the recipe. If not, scale accordingly.

Amy says

So if I wanted to convert a 7 inch layer cake to a 9 inch I would have to multiply everything by 0.6?

Rebecca Dare says

This is such a huge help as I am TERRIBLE at math... I am following a recipe which is for x2 9x2 inch round pans and am wanting to put this into x4 6x2 inch round pans. Am I right to think I would scale this by 0.88? For a cake I baking on Thursday so will be super grateful for a reply 🙂

Jasline N. says

Hi Rebecca. Yes you are correct. Basically you will need to scale a recipe by 0.44 if you want to convert from two 9x2 inch to two 6x2 inch. So if you want four 6x2 inch, you can scale the recipe by 0.88.

Lorel says

Add me to the list of people who want to THANK YOU for creating this calculator!

Suruchi says

Very helpful. Thank you so much.

Mary Pat says

So if recipe for 9 in cake converts to 6 in cake with a factor of .44, in theory our full 9 inch recipe would make approximately two 6 inch cakes?

Jasline N. says

Hi Mary Pat, that is correct!

Jes says

This article was very helpful, thank you.

The recipe i’m trying to convert is for 2 cake tins (so from two 8 inch to two 6 inch). Is the calculation still the same? i.e., do I just adjust the recipe based on the formula of one tin – meaning i reduce my recipe by a factor of 0.56?

Jasline N. says

Hi Jes, yes you are right, just multiply the ingredient quantities by 0.56 and use that amounts for 2 6-inch cake tins. Glad the post us useful for you!

Romina says

Hi this is awesome thank you. I just want to confirm I’m trying to convert a 9 inch cake pan recipe to a 11 x 13 rectangular cake pan and my scale factor was 2.09 is this correct? so am I adding extra or less ingredients? Thanks

Jasline N. says

Hi Romina, you will need to multiply your recipe by 2.09 🙂

Administrador Gral. says

Your scale factor doesn't work as well as I thought. I couldn't even see the rest of the scale factor number when I enter the dimension for the original pan to the pan I want to use. Useless crap

Jasline N. says

Hi there! Can I know in detail what do you mean by you couldn't see the rest of the scale factor number? What are the cake pan sizes you inputted? Do you need more decimal places to work with?

Candice says

I had the same issue, until I read the instructions. If you can modify it to throw up an error if the dropdown has no value, that might help those of us who launch head-first and don’t think they ~need~ to read the instructions XD

Jasline N. says

Hi Candice, that sounds like a great idea, let me modify the formula when I have time 😉

Administrador Gral. says

I found this post very helpful. Thank

Nagi@RecipeTinEats says

This post is such a big help. Thanks for sharing it with us!

jeannietay says

Thank you so much, it's a great help indeed. Hope you will do a cups/grams conversion as well soon:P

Jasline N. says

You are welcome Jeannie! I'll try my best to do up one!