Calculating the size of printed image

Print size can be easily calculated by dividing the image width and height in pixels by the the print resolution, and multiplying the quotient by the length of the image, 1 inch ("), and 1" Converts to an millimeters (25.4) or centimeters (2.54), depending on the unit in which we want to get the result. Here's an example.
Data:
-digital image with dimensions of 1600 by 1200 pixels,
-print resolution 300 dpi,
-the standard unit of length 1"
Searched:
-the dimensions of the image when printed in millimeters
Solution:
1600:300*25,4 = 135,5mm (printing width)
1200:300*25,4 = 101,6mm (printing height)

If the dimensions of the image when printed we want to get in inches, then we divide only dimension in pixels by the resolution.
Eg. width 1600:300=5,33" and height 1200:300=4".