Calculating image size in inches or dpi from pixels using php

Question

I need to calculate an approximate image size in inches assuming 300dpi.

I have a target image size in mind, and i want to show the user if the image they have uploa

Answer 1

Given that dots == pixels:

size in inches = size in pixels / dots per inch

so if you have an image that's 900 pixels wide, at 300 dpi it will be printed at 3 inches.