Chocolate Birthday Cake Calculator



For those times that you need chocolate cake but you can’t find a tin the right size in your cupboard.

Skip to the calculator

For those times that you need chocolate cake but you can't find a tin the right size in your cupboard.

It seems that there’s a lot of love around for my Chocolate Birthday Cake Recipe and I’ve started to get requests for the quantities to make it in various different shapes and sizes. So far each time I’ve been asked I’ve tapped away in excel to work out what’s needed, but I thought it was about time I sorted out a calculator (just like my vanilla birthday cake calculator) so you can do it yourselves without waiting for me.

All you need to do is to enter your tin dimensions and the number of layers you’d like the cake to have into the boxes and it’ll tell you what you need. I hope you all find it useful…

Round Tin

Square or Rectangular Tin


As with the vanilla version, I’ve not tested the cake in all possible sizes but as long as you don’t stray too far from the original quantities it should still work well.

Cooking times and temperature are the same as in the original recipe. However, if you decide to put a 2-layer cake into one deep tin rather than splitting it into two sandwich tins, you should wait to check it until it has been in the oven for at least 45 minutes (otherwise it’ll sink in the middle).

If you only know your tin measurements in inches, simply multiply them by 2.5 to get the dimensions in centimetres.

If you’d like to use the recipe to make cupcakes instead of one big cake, the quantities for a 20cm round cake with 2 layers will give you enough mixture for 12 cupcakes. They’ll take 25-30 minutes to cook.

4 Comments:

  1. Thank you so much for your chocolate cake calculator! I have the same approach to birthdays as you for my two boys. They choose the cake theme and I scour Pinterest for ideas. I need to make a Harry Potter cake next week for my 5 year old’s birthday. I have ordered a 22x32cm rectangular cake tin to make a spell book, but then just couldn’t find a choc cake recipe I trusted. Your calculator is so clever and much appreciated!! Can’t wait for the tin to arrive and have a go!

  2. silly question…..but the buttercream quantities….is that enough for the middle of the cake and around?

    • It should be enough to fill the middle of the cake, cover the top and have a thin layer around the sides.

Leave a Reply

Your email address will not be published. Required fields are marked *