Pixels to Centimeters Conversion Calculator. How to convert pixels (X) to cm? If you find a bug or could find it better to fix the calculator in Google Chrome, please email us on our Contact Us page. Convert Pixels and Gives the Pixel Dimension: This Google calculator will give you the pixel dimension in pixels (X). The GPX and HP values are the total size of the image. You can change the pixel dimension to the dimension we want to convert, for example, to calculate the width and the height. It is not necessary, to know the specific type of images you are trying to measure, that's why it's advisable to enter “pixels/GPX” and “HP/GPX” values in only one line: Pixel Dimensions (PX) and Pixel Density (dpi) Image Size (Pixels) and Image Size (GPX) If we enter the dimension of image in the Google calculator, then the image dimensions (X) and (Dpi) will appear on the right side.