or 20 cm x 40 cm = 7.874 inches x 15.748 inches
How many inches is 20 x 40 cm? The answer to this question is 20 x 40 cm is equal to 314.9606 inches. If you want to calculate the area, then the answer is 20 cm x 40 cm equals 7.874 inches x 15.748 inches, and the final calculated area is 123.999752 square inches.