or 21 cm x 30 cm = 8.2677 inches x 11.811 inches
How many inches is 21 x 30 cm? The answer to this question is 21 x 30 cm is equal to 248.0314 inches. If you want to calculate the area, then the answer is 21 cm x 30 cm equals 8.2677 inches x 11.811 inches, and the final calculated area is 97.649804 square inches.