Calculating the size of image in pixels

To get the image size in pixels, multiply the dimensions in units of length by the print resolution. Here's an example.
Data:
-image resolution 300ppi,
-image width 135,4mm
-image height 101,6mm,
-the standard unit of length 1"
Searched:
-image size in pixels
Solution:
135,4*300:25,4=1600 pixels
101,6*300:25,4 = 1200 pixels

If the dimensions are given in inches, we only multiply the size by the resolution. Eg. Width 5.33 "* 300ppi = 1600 pixels and a height of 4 "* = 300ppi 1200 piksels