Cake tin size conversions

How often have we searched for a tape measure that shows inches and centimetres to correctly gauge the size of an inherited cake tin which we know is 8 inches but need to know how many centimetres it is.  Hopefully this guide will make things a bit easier.



Cake tin size conversions 


47 thoughts on “Cake tin size conversions

    • Hi Kath,

      As a general rule of thumb, a square tin holds approximately 25% more than a round tin of the same size, therefore reduce the round cake tin size between 2cm and 2.5cm (±1 inch) to arrive at the equivalent size of a square tin.

      Approximate conversions

      Round Tin 15cm or 150mm (6 inch) to Square Tin 13cm or 130mm (5 inch)
      Round Tin 18cm or 180mm (7 inch) to Square Tin 12.5cm or 125mm (5 inch)
      Round Tin 20cm or 200mm (8 inch) to Square Tin 18cm or 180mm (7 inch)
      Round Tin 23cm or 230mm (9 inch) to Square Tin 20cm or 200mm (8 inch)
      Round Tin 25cm or 250mm (11 inch) to Square Tin 23cm or 230mm (9 inch)
      Round Tin 28cm or 280mm (11 inch) to Square Tin 25.5cm or 255mm (10 inch)
      Round Tin 30cm or 300mm (12 inch) to Square Tin 28cm or 280mm (11 inch)

      Also, If you’re using a square tin for a round tin recipe, keep the oven temperature the same, and turn the cake halfway through baking, as the corners tend to cook faster than the middle.

      I think this comment is going to look a bit untidy so I will publish it as a post next week too.

      Hope this helps 🙂

  1. Pingback: Square cake tin to round cake tin conversions « The Complete Cook Book Blog

  2. i have a recipe for a 8″ all in one birthday cake mix can you tell me how much mix i would need for 10″ 12″ 14″ please for a sponge wedding cake
    i need this urgently please … also would the same conversions be for a victoria sandwich…

    • Hi Mary, welcome and thanks for stopping by. Baking measurements are quite precise and I would hate to ill advice you and have your cakes turn out flops so the best I would suggest is to proportionately use more mix per every 2′. Alternatively depending on how many cakes you are going to bake, mix up 2 to 3 batches of the cake mix and divide it between the pans and remember that your baking times may vary too. Hope this helps. Best of luck. 🙂

    • Hi Rosemary. I would suggest on filling the 21cm tin ¾ full and possibly use the balance of your mixture in muffin pans. It all depends on the recipe you are using. Hope this helps. 🙂

    • Hi Sal, I can only assume you are over baking your cakes causing them to be dry. Baking requires exact measurements so take note when measuring your ingredients and don’t over mix your ingredients. I hope this helps. Have a super day. 🙂

    • Hi Becky, thanks for stopping by and my apologies for only replying now. You can use a standard sponge recipe or try anyone of the cake recipes here on my blog. Have a super day. 🙂

  3. Hi, I have been asked to make a character cake (minnie mouse) I will be doing it as a carved cake head only. But with wastage from carving I have no idea what size pan to use I am looking at feeding 30 (a mix of children and adults) any help would be great. Thanks Sandra

    • Hi Sandra, would it not be easier to rent a shaped pan which would eliminate your wastage concern as well as being big enough not to worry about pan sizes. If you want to go the route of round or square tins, it would depend on the quantity of your mixture to what size tins you would use. Most recipes give an indication of what size tin to use. Good luck with your cake. Have a super day. 🙂

    • Hi Christel, thanks for stopping by. The best I can suggest to you is to leave a quarter of the mixture out and possibly bake it in something separate so as not to waste it. Hope you have a good result. Have a happy day. 🙂

  4. Making a cheesecake that requires a 23cm cake tin, and mine is 28cm. How much more mixture do you think I’ll need? Thanks

    • Hi Hannah, I would suggest just having a “flatter” cheesecake, alternatively not knowing what recipe you are using, would suggest making up another 1/4 recipe. Have a super day. 🙂

  5. Pingback: 6 Inch Round Cake Baking Tin

  6. Hi I have a middle eastern cake / slice to be made in a 20 x 50 cm tin, then you pour over a syrup hence I can not buy a tin that big. Can you tell me a size, possible in two tins that would work.

  7. Trying to make a rich birthday cake in a 30cms pan, I’m on the second try now but it’s very stoggy at bottom so hence it’s sinks in middle ..think is it because it’s such a big cake could I just make half dozen skinny ones in same pan instead and how do I work out temp and cooking time

    • Hi Jane. All recipes for baking differ so best option is to either follow and use pans as indicated or try the smaller or more pans and keep the temperature the same but shorten the baking time dependent on how many pans you are using. It is also suggested not to open the oven door too often through the baking process so it is going to be a lot of trial and error I’m afraid. Hope that helps a little.

  8. I am baking my daughter’s wedding cake the first layer is a rich fruitcake ,tin size25cm square Can I bake it in a 30cm round tin instead?

  9. Hi, I have a recipe for a 20 cm sponge, but I want to make it bigger and use a 23 cm baking tin. Shall I just make up an extra 25% of the mixture? Will this take longer to cook and should I use a lower temperature?

    • Hi Juliet, baking isn’t always as easy as just increasing – it is more an exact science so can’t say. I would rather suggest making 2 mixtures and bake then in the 20cm pans.

  10. Hi,
    I have a recipe that calls for a cake slice tin. I live in Canada and have never seen a recipe call for “slice tin”. Can you please tell me what it is?
    Thank you!

    • Hi Tina, I can only think a cake slice tin, is just that, a tin in the shape of a slice – like a pizza slice shape but a deeper pan? I can’t say I have heard of one before either. I wonder if your recipe gives dimensions of the tin so you could substitute another pan?

  11. Hi’ I want to bake a chocolate cake for my parents anniversary but i dont understand than which quantity i used to make a spongy cake and i have a 21 inch of flower shape of cake tin plzz help me…

  12. Hi, please i want to bake 5cm cake in 20 places for xmas hamper, what measurement of ingredients do i need and what degree can i set my oven and for how many minutes of hours will the cake baked? thank you

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