Originally Posted by Wendysbows
I want to say ribbon length is about four times the size of the finished bow and add on any extra for tails. Don't go to the bank with that though...I am not absolutely certain. When I use 18 inches of ribbon, I end up with a 4 inch bow...no tails, just an inch on each end for sewing in the middle. Hope that wasn't too confusing and that it helps.
That's what I do, too! My 2 1/2 TBB are 13 inches of ribbon
I think I leave 1 1/2 inches for the tails though for that size.