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Please help- want to increase quantities but unsure how to adjust cake tin size?!

(4 Posts)
letsbehonest100 Wed 02-Apr-14 17:24:39

I have a recipe for an 8 inch square tin. I need to make a bigger cake, so I thought I'd increase the quantities by half.

I had assumed that this would mean I needed a 12 inch tin- but after a quick google I'm now confused as apparently its not that simple!

Can anyone advise me as to what size of tin I need.

Also, cooking time is an hour (choc cake), I'm not very sure how much to increase cooking time by and again would really appreciate advice.

Redirected Wed 02-Apr-14 18:18:01

It is easy to work out when you remember that the measurement is all about what is going into the tin - not around the edges of it smile

You get the answer by working out the square:
8" x 8" = 64 square inches
12" x 12" = 144 square inches. More than twice as big!

You want something approx 96 square inches (1.5 x the size of the 8" square) so a 10" square (100 square inches) would be just about right.

Redirected Wed 02-Apr-14 18:22:15

Time depends so much on the oven.
For non fan, add on about half the original cooking time.
For fan - personal experience says add a third and then keep checking, as they cook much faster

4merlyknownasSHD Thu 08-May-14 09:41:26

Increasing the cooking time is one thing, but getting the heat in to the middle of the cake takes longer, the larger you go. There is a risk that the outside of the cake may get a little crisp before the middle is completely cooked. Putting a cake cone (inverted aluminium cone) in the middle of the cake would draw the heat in and cut the cooking time. Instead of the middle of the cake being 5 inches from a heat source (on a 10" square cake), the furthest any part of the cake would be away from a heat source would be about half that. The cake would be more evenly baked.

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