Given:
120 pieces of fabric.
Each fabric is a square with a side length of 6 inches.
Area of each square = (6in)² = 36 in²
36 in² * 120 pcs = 4,320 in² is the total area of the blanket.
4,320 in² is the maximum area of the blanket. If you only use a few pieces of fabric, simply multiply the number of pieces used by 36 in².