How many square inches is 15 centimeters by 15 centimeters?

15 centimeters times 15 centimeters is 225 squarecentimeters. That cannot be converted to linear inches, but must be converted to square inches.

15 centimeters squared = 2.32500465 square inches. That result was gotten simply by typing 15 centimeters squared in square inches into the google search bar.