Hi gang!!

Reeeeeeeally hope someone can help me out right now. I need to find a place to go online that will help me figure out block sizes when cutting out QSTs.

I am playing with a little project where I had a 16" square and cut it into QST. I want to insert a square of fabric in the middle as I want to use the QSTs and put it on a point. What size am I to cut my center square???

After I cut my 16" square into QSTs, my QST triangles measure approx. 11 2/8" on the short ends, and my long side is approx. 15 7/8"

HEeeeeeeeeelllppppp!!!