Originally Posted by
yweinst
I'm trying to figure out how much of a border I would need to add to create a king size quilt using the 6.5 yards for the obw center part...
You're probably going to lose about 20% to 25% of your 6 yards to seams. If you don't discard any of the triangles, the finished size you can get from triangles from 6 yards is about 75" to 80" square. I usually make a Queen 100 x 100. That would mean you'd probably need a 12-1/2" finished border around the quilt. 3 yards would give you 10" borders. So, you'd probably need an inner border about 3" finished.