I am planning on decorating 300 cupcakes this weekend. I want to pipe the icing on in a swirl using a round tip. I haven't done many cupcakes before and am having a hard time figuring out how much buttercream I should have on hand. Any advice would be much appreciated, thank you!
Hey!
Here is a link to icing amounts per cups of batter that you use! HTH
http://www.wilton.com/cakes/making-cakes/baking-party-cake-2-inch-pans.cfm
I use around 50g of icing on a cupcake, when doing a 1M swirl. I think a round tip would use a similar amount. So, 300 cupcakes would be 15kg of icing. In ounces, that would be approx 2oz per cupcake, around 37.5lbs in total. I would do a kilo/couple of pounds extra, just in case. I have no idea how many cups that would be though, sorry.
I'm looking for the same answer, I need 150 cupcakes and decorate with a big star tip, swirl.. having trouble finding out!
I just found somewhere online where you will use about 5 cups of icing for 24 regular sized cupcakes if you are doing the 1M swirl on top. (Which uses a lot of icing.) Eek!
How many cups in 1 batch? maybe 5? that's probably not too bad - 1 batch of icing for 2 doz cuppies... just sounds like a lot when you say 5 cups
Yeah, I guess your right. I needed to make whipped chocolate ganache for my cupcakes.....my recipe called for 1 lb chocolate so to make 4 batches of that is going to be 16 bars of chocolate...at $2.50 each! But it is going to be so yummy! 
My personal experience has been the round tip uses more frosting than the swirl. I did frost 16 dozen cupcakes with the swirl and I ended up having to make more frosting. I don't measure in cups, I just go by the buttercream recipe I use and how many a double batch will frost. It also depends on how large your cupcakes are (liner sizes vary a lot).
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