What is 5 inches by 7 inches in centimetres?

12.7 cms by 17.78 cms

1 inch = 2.54 centimeters

5 inches * 2.54 cms/1 inch = 12.7 cms

7 inches * 2.54 cms/1 inch = 17.78 cms

5 inches by 7 inches = 12.7 cms by 17.78 cms