There are a few online fret calculators that will give you the fret spacing for any given scale length.
. lets you print a multiple page template. Enter you scale length and other info and click Submit. Then on the next page, request PDF Files (multiple pages). Use tape or spray adhesive to attach it to the fretboard and a straightedge and razor knife to scribe the position
FretFind2D is the one I use. No need to download an app, plus if you enter enough parameters it will also print the nut & bridge location with markings for where to cut the slots for strings.
The StewMac Fret Calculator
can give you fret measurements for many different instruments. It doesn't print a template but will give distances in inches or mm, it's more precise to choose mm. When measuring, always measure from the nut, it's more precise that way.
is a downloadable application for Windows computers. I've also attached it below as a downloadable file.
Anyone else have solutions?