How Much Fondant Do I Need?

Decorating By handsomepants Updated 23 Feb 2011 , 12:50am by CiNoRi

handsomepants Posted 29 Apr 2010 , 7:45pm
post #1 of 7

Where can I go to find out how much fondant I will need to cover my cake? I ask this because I only have a bout 1.5 lbs of white fondant, and I need to know if it will cover the center tier of a topsy turvy cake I'm making so I don't have to go out and buy some more. I don't know how big the tier is going to be yet, so I'm just needing some conversion rates. Can anybody help?

6 replies
idgalpal Posted 29 Apr 2010 , 7:58pm
post #2 of 7

Globalsugar Art has a fondant calculator:

CiNoRi Posted 22 Feb 2011 , 3:35pm
post #3 of 7

Im getting into cakes that do not fall under the GSA scale... like for instance I have a cake that will be roughly a 9x13 cake that is 15 inches would you go figuring that one out? icon_wink.gif

Anyone have a calculator or trick to judging cakes that are not in your standard sizes?

janeoxo Posted 22 Feb 2011 , 4:01pm
post #4 of 7

The chart tells you that a 9x13 that is 2" high needs 40oz. Therefore your cake is just under 8 times bigger so just do the sum
8 x 40 which is 320oz


CiNoRi Posted 22 Feb 2011 , 4:08pm
post #5 of 7

Stupid question I'm sure, Math and I are not friends icon_wink.gif... but would it be considered 8ish times more? You are only adding for the extra hight... and not necessarily the amount of fondant to cover the 9x13 "top" area for each multiplication? Does that make sense?

janeoxo Posted 22 Feb 2011 , 10:10pm
post #6 of 7

Yes that's true I didnt think of that, very stupid of me

CiNoRi Posted 23 Feb 2011 , 12:50am
post #7 of 7

Ok, so my husband helped me figure it out if anyone wants to confirm the math. He figured out the oz per square inch based on the chart, and then multiplied that by the size of my cake. The chart says a 16" square that is 4" high needs 120oz of fondont, so:

120/((16*16)+((16*4)*4))=.234375 oz per square inch

My cake is 9x13 and 15 high, so:

((9*13)+((9*15)*2)+((13*15*2)*.234375=~182 oz

The interesting part is the chart seems to require more fondant per square inch the smaller the cake, so this may be a tiny bit to much, but pretty close.

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