# Welcome to the Cake Decorators Q&A

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I am converting Pauls choc cake recipe for various size tins.
The lesson says to start with 10″ square. In the question “choc recipe” you gave the ingredients for an 8″ square or 9″ round which I used and the cake came out lovely.
I am now dong different size tins and am converting using the ready reckoner. I thought I would convert the 10″ square to the 8″ square first to check I am doing it correctly but I am getting different answer to yours.
Example is Paul uses 330g butter for his and by using the reckoner I get 198g but your ingredients for 8″ square says 220g.
As the 9″ round cake I made using your ingredients was great I am a bit confused as to what I am doing wrong with the reckoner.
Im also slightly confused how it says the ingredients make either a 10″ and 6″ round or a 10″ square. That seems to be a lot of difference for the same ingredients.
Really think i have my confused hat on today lol x

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I am converting Pauls choc cake recipe for various size tins.
The lesson says to start with 10″ square. In the question “choc recipe” you gave the ingredients for an 8″ square or 9″ round which I used and the cake came out lovely.
I am now dong different size tins and am converting using the ready reckoner. I thought I would convert the 10″ square to the 8″ square first to check I am doing it correctly but I am getting different answer to yours.
Example is Paul uses 330g butter for his and by using the reckoner I get 198g but your ingredients for 8″ square says 220g.
As the 9″ round cake I made using your ingredients was great I am a bit confused as to what I am doing wrong with the reckoner.
Im also slightly confused how it says the ingredients make either a 10″ and 6″ round or a 10″ square. That seems to be a lot of difference for the same ingredients.
Really think i have my confused hat on today lol x

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Hi jb1958

Both your calculations and the 8″ square are correct, there is 10% difference to make the cake slightly deeper. So if you use the reckoner you have to reduce all the ingredients to 60% of the original. The ready reckoner is only correct to one decimal place, there is a built in error of up to 5% which is not significant from a baking point of view.
If you want your cake deeper you can add more ingredients providing the proportions remain the same. I hope this makes sense. x

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Sorry didn’t reply earlier was busy baking! Just wanted to say thank you your reply was a great help x

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You’re welcome jb x

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