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I am new to the forum and to Gimp.  
I am trying to create a printable grid.  I found the pattern grid but its units are only in pixels.  I know that in my drawing an 1/8th inch is 37.5 pixels.  But fractions are not allowed.  Is there a way to create a printable 1/8th inch grid?  I suppose a half of a pixel may not be worth effort, but I'd like to know if there is another way to do this.

Thanks!

Pos

Gimp is pixel based, units such as inches are only there for when it comes to printing. You can get round the minimum-unit-is-the-pixel by using paths, but no straightforward way just to change units from pixels.

Get one of Ofnuts plugins path-grid-0.1.py (date 2014-01-25) from http://sourceforge.net/projects/gimp-pat...s/scripts/

That goes in your User Gimp profile plug-ins folder C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\plug-ins

Might go like this:
1) Image -> Print Size to determine the horizontal and vertical resolution (ppi)
2) Filters -> Render -> Pattern -> Rectangular grid path and a bit of arithmetic the ppi resolution / 8 (for 1/8ths inch)
3) That gives a grid of paths which is not printable.
4) Always best to make a new layer for the grid, easy to fix if something goes wrong Layer -> New Layer
4) Set the FG colour to what you want
5) Use Edit -> Stroke path and a line width.
6) In the path dock turn the visibility off (the eye icon toggles)

That is about as accurate you will get using a bitmap editor.

Some screenshots that might help: https://i.imgur.com/3NZDnzQ.jpg