Convert Pixels To Inches
First you need to know the DPI (dots per inches) resolution of your current dispaly device
To determine the DPI resolution of your current display setting, get some household tape or a ruler and measure the width of the green bar above. Now use the table on the right to find out your DPI resolution based on your measurement of the green bar. The DPI is about 75 on most monitors.
Now you're ready to convert pixels to inches (Output to Monitors/Printers)
The forumla is: Pixels ÷ DPI = Inches
So for example, if you want to know what the physical size in inches will be of an image 400 pixels in width and 100 pixels in height when it is displayed on a visual output device of 75 DPI, then perform the equations 400 ÷ 75 and 100 ÷ 75 to give you a width and height of 5.33 and 1.33 inches respectively.
You can also convert inches to pixels (Input from Scanners)
The forumla is: Inches x DPI = Pixels
So for example, if you want to know what the dimensions in pixels will be of a photograph 7 inches wide and 10 inches high when it is scanned into a computer with a scanner operating on a resolution setting of 75 DPI, then perform the equations 7 x 75 and 10 x 75 to give you a width and height of 525 and 750 pixels respectively.