How to calculate PPI?The Formula for PPI is.
All the Computer that has a Different Size screen has a Different PPI.You can Google Directly you computer's Model.What is PPI and How to Adjust this virtual ruler to actual size? Or need to find a online ruler to scale.We strongly advice that you can set the pixel first so you will have a more accurate measuring ruler online.The most important is that it is free online ruler if you need to adjusted to an actual size Our ruler combine online millimeter ruler with online ruler inches,And your can find the not only decimal but also fraction for online ruler cm(or millimeter ruler). If you need a accurate online ruler which based on the standard of the metric ruler or a PDF Online Ruler Download
