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How to I 'up' the ingredients for a 8'' cake receipe using a 9.1/4'' tin

(9 Posts)
pelvicflawed Sat 19-Sep-09 06:43:33

I'm attempting to make an apple and rasin cake (receipe from the WI book of cakes and biscuits) the receipe is for a 8'' tin but I only have a 91/4'' tin - any ideas what proportion I have to up the ingredients by?? - thanks

Besom Sat 19-Sep-09 07:17:47

I'm not a cake maker but if your tin was 9 1/3 inches it would be 1/6 th bigger than an 8 inch tin, so if you divided the ingredients by six and then added on 1/6th you would have slightly more than you needed.

Divide it by seven and add on a seventh and you will have a bit less.

I think that's right. It's a bit early in the morning!

pelvicflawed Sat 19-Sep-09 09:33:50

That sounds good - thanks

CokeFan Sat 19-Sep-09 09:58:50

Er... Assuming these are circular cake tins and you want the same "depth" of cake in each then I'm not sure that'll work. Don't you need to work out the relative volumes of each tin?

e.g., 8" tin area of bottom of tin will be (pi x r2) or 16 x pi = approx 50.25 inches squared.

For the 9.25 inch tin (radius 4.625 inches) the area will be 67.20 inches squared.

Assuming you wanted, say a 1 inch depth of mixture in each you'd have 50.25 inches cubed and 67.20 inches cubed respectively.

So the 8 inch tin holds approximately 3/4 of the mixture that the 9.25 inch tin holds.

If the tins are square then the calculation will be different - 8 inch tin area will be 64 inches squared, 9.25 inch tin will be 85.56 inches squared so 8 inch tin still holds approx 3/4 of mixture that 9.25 inch tin holds.

SomeGuy Sat 19-Sep-09 17:01:24

The tins might be deeper, but it should be (9.25/8) squared, which is 33.69% more.

So add a third to all the quantities.

pelvicflawed Sat 19-Sep-09 19:44:39

Thanks all for you help - will have a go tomorrow and see what we get!!

Besom Sun 20-Sep-09 09:21:12

Ha, sorry I was talking crap. That's the same urge I have if someone asks for directions and I give them even though I don't really know!

pelvicflawed Sun 20-Sep-09 13:15:03

Just to let you know have made cake this morning and added 1/3 to each of the ingredients - it looks good (the test will be in the eating when I take it to work tomorrow). Thanks to all of you who offered help.

Grisette Mon 21-Sep-09 20:04:28

I'd just make 1 and a half of the mixture and make fairy cakes with the excess...

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