Pixel (PX) to other length units (mm, CM ...)

Today, we want to convert Px to mm, because the size of the pixel-to-other unit ratio varies with the resolution size set on the screen, so it cannot be calculated using a fixed number.

Solution:

Put a hidden block with a height of 1mm on the page <Div id = "divmmheight" style = "height: 1mm; display: none;"> </div>,

Then use jquery to get its height var mmtopx =$ ("# divmmheight"). Height (); the height of mmtopx is the PX size corresponding to 1mm,

The next step is to get the pixel height calculation of the object and get the length in mm unit after division with this ratio.

The same applies to other units.