I'm coming down to the wire on my mountain cake and I need to order my fondant, but I am pulling my hair out trying to figure out how much I'll need. The cake will be 16" tall at the highest point and 18" wide at the widest point going lengthwise and 10" at the widest point, widthwise. All the charts discuss covering tiers, which I obviously won't be doing. I suppose if I remembered my trig from high school 20+ years ago this would be easier, but I don't.
Can anyone give me an idea how to figure this out? You'll be my friend for life!!
Well... at a rectangular shape... surface area for your dimensions (18L x 10W x 16H) in inches is 1256 square inches.
1 Pound of fondant should cover an 8" x 4" cake... 8 x 4 cylinder surface area being 100 sq. inches.
So your project of 1256 sq inches divided by 100 sq innches = 12.56
12.56 x 1 pound of fondant = 12.56 (or 13) pounds of fondant.
You actually could shoot for a little less because you are doing mountains... not a full rectangle and the surface area isn't the same amount... but I would say if you did 11-12 pounds you would do just fine.
Thank you, Darthburn. I couldn't find anything telling me how much are 1 lb of fondant covered!