I remember there was a full-scale 26" or so down-loadable dulcimer fretboard template (I wish I had saved it!)...
updated by @bob: 03/09/17 02:01:43PM
There has been a heap of calculators and spreadsheets posted or discussed on the site in the past, but they don't seem to show up in a search on the new site.
Here's one such, but it's lost it's attachments in the move.
This is the Equal Temp one.
Hi, the free on-line fret calculator from Stumac does have the 6+ fret - except they call it number 7 So all the fret numbers they use after that are one higher until the 13+ which they call 14 and so on. It is accurate for equal temperament and it also includes the suggested additional length you should add to the VSL for intonation. Don't forget this whatever calculator you use or your higher frets will play sharp. For example: If you are using a 28" fret scale then the bridge should be actually placed at 28.165". If you like a high action then the bridge should be moved even further from the nut. Some folks will use a reasonably wide bridge set into the bridge slot that can then be shaped to get the string release points accurate for intonation. Or you can do it the old way and use a floating bridge (I have quite a few dulcimers with floating bridges).
I still use the old Wfret program. Not the new one which does not have special setting for dulcimers. I can plug in any desired VSL and fret patter (no plus frets or 6+ & 13+) and method of spacing calculation, and get a printed out "ruler" which works just fine. The program was posted on the old FOTMD, in the Building Group, IIRC, and the posting should still be there. Do a Search here of Wfret.
@caleb-dan-Bennett I have the Cigarboxnation fret calculator on CD... I picked it up from them a year or so back.... Its nice...
I have looked at those templates but they are chromatic and not the scale lengths I want. Also have used the calculators from both bear meadow and stewmac. I noticed that they give different results for same VSL. Not sure why that is. I use the bear meadows because it gives the 6+ fret. Stewmac doesnt.
One of those should work for you.