or 30 cm x 40 cm = 11.811 inches x 15.748 inches
How many inches is 30 x 40 cm? The answer to this question is 30 x 40 cm is equal to 472.4409 inches. If you want to calculate the area, then the answer is 30 cm x 40 cm equals 11.811 inches x 15.748 inches, and the final calculated area is 185.999628 square inches.