First of all---that is a great buy making the FQ a dollar each. I have no idea on how many FQ you would need but I bet if you google king size quilts made out of FQ you may get your answer. I might suggest you don't start on a king size as you may get bored or frustrated to get it finished. My first quilt was a lap size quilt I made in a quilt shop class and I felt accomplishment and then moved on from there. Welcome to this QB. It has wonderful members and there is always good advice or all of your questions answered. The members are terrific.