How much fabric is needed for a patch work-twin sized quilt where the patches are 6"?

I am making a twin sized quilt. Its patch work and I am terrible at math. I am using 2 colors and the squares are 6"x6" and the seam allowance is 5/8 and it usually cuts down to 5 inc squares. How much fabric will I need of each color (2 colors) if the blanket was 70"x 85" = 6'x 7'. ?