Posted by atharva on May 19, 2017; 9:29am
URL: https://forum.librecad.org/Importing-a-drawing-on-a-graph-paper-tp5714827p5714866.html

Happy to report that this worked for me. Thanks again. Here is what I did.

1. Look up the image properties in any image software. What you are looking for is PPI or DPI.
2. Import -> Image into LibreCad and specify the DPI in the box for DPI
3. Use the measurement tool to measure a couple of distances (make sure they are at least 20-30mm for better precision)
4. If the real measurement is say 100mm and it shows 50 in LibreCad your scale factor is 2 (100/50)
5. Scale the image and specify 2 as the scaling factor.

Check a few dimensions to make sure you are within acceptable range.