Fretfind
FretFind2D is a two dimensional fretboard design tool. FretFind2D doesn’t just calculate fret spacing. It models the entire fretboard, strings and frets, as a system of line segments on a two dimensional plane, ready to download and print.
For normal Guitars the simple options are totally enough. If you want to work with multiple scale lengths and nonparallel frets, turn on the extended mode.

 single

 fundamental scale length
The scale length is the playing/speaking length of the string measured from the nut to the bridge. It is perhaps more properly twice the distance from the nut to the octave fret. The fundamental scale length is the length of a line drawn from the middle of the nut to the middle of the bridge. For single scale length instruments that line is the perpendicular bisector of both the nut and the bridge. I call this length "fundamental" because on a standard instrument with a narrow nut and a wide bridge the outer strings actually have a slightly longer scale length.
 multiple

 first string scale length
 The scale length is the playing/speaking length of the string measured from the nut to the bridge. It is perhaps more properly twice the distance from the nut to the octave fret. Enter the actual scale length of the last (traditional low E) string.
The scale length is the playing/speaking length of the string measured from the nut to the bridge. It is perhaps more properly twice the distance from the nut to the octave fret. Enter the actual scale length of the first (traditional high E) string.
last string scale length
perpendicular fret distance
The perpendicular fret distance is the ratio of distances along the first and last string that fall on a line perpendicular to the midline of the neck. This is used to control the angle of the nut, frets and bridge.
Traditionally this property of nonparallelly fretted fretboards is measured by assigning a "perpendicular fret". "Perpendicular distance" avoids two problems with the "perpendicular fret" method. First, it is possible that no fret falls into this perpendicular position. With "perpendicular distance" we avoid fractional frets. Second, it is possible and even likely with nonequal temperament fretboards that as a fret crosses the fretboard it will fall at different ratios along the strings. With "perpendicular distance" we avoid complex calculations and have more predictable results.
A value of 0 results in a perpendicular nut. A value of 1 results in a perpendicular bridge. The default 0.5 results in a perpendicular octave fret. To calculate an appropriate value for any fret, simply divide the distance of the fret from the nut by the total length of the string. In twelve tone equal temperament the values look like this:
Fret P.D. Fret P.D.
1 0.05613 13 0.52806
2 0.10910 14 0.55455
3 0.15910 15 0.57955
4 0.20630 16 0.60315
5 0.25085 17 0.62542
6 0.29289 18 0.64645
7 0.33258 19 0.66629
8 0.37004 20 0.68502
9 0.40540 21 0.70270
10 0.43877 22 0.71938
11 0.47027 23 0.73513
12 0.50000 24 0.75000
 individual

Danger: Experimental!!!
 string scale lengths:
 perpendicular fret distance
The scale length is the playing/speaking length of the string measured from the nut to the bridge. It is perhaps more properly twice the distance from the nut to the octave fret. Enter the actual scale length of the each string.
The perpendicular fret distance is the ratio of distances along the first and last string that fall on a line perpendicular to the midline of the neck. This is used to control the angle of the nut, frets and bridge.
Traditionally this property of nonparallelly fretted fretboards is measured by assigning a "perpendicular fret". "Perpendicular distance" avoids two problems with the "perpendicular fret" method. First, it is possible that no fret falls into this perpendicular position. With "perpendicular distance" we avoid fractional frets. Second, it is possible and even likely with nonequal temperament fretboards that as a fret crosses the fretboard it will fall at different ratios along the strings. With "perpendicular distance" we avoid complex calculations and have more predictable results.
A value of 0 results in a perpendicular nut. A value of 1 results in a perpendicular bridge. The default 0.5 results in a perpendicular octave fret. To calculate an appropriate value for any fret, simply divide the distance of the fret from the nut by the total length of the string. In twelve tone equal temperament the values look like this:
Fret P.D. Fret P.D.
1 0.05613 13 0.52806
2 0.10910 14 0.55455
3 0.15910 15 0.57955
4 0.20630 16 0.60315
5 0.25085 17 0.62542
6 0.29289 18 0.64645
7 0.33258 19 0.66629
8 0.37004 20 0.68502
9 0.40540 21 0.70270
10 0.43877 22 0.71938
11 0.47027 23 0.73513
12 0.50000 24 0.75000

 equal
 nut & bridge

nut bridge  first & last

last first  all

last first nut bridge

 equal (root 2)
 just (scala)

The calculation method determines how FretFind calculates fret placement.
There are two input modes.
 Equal:
 uses the X^{th} root of two, a standard method for calculating equal temperaments. You enter the number of tones per octave.
 Scala:
 uses a Scala SCL file which allows you to specify each scale step exactly in either ratios or cents. If you are interested in creating your own scale, please read this description of the Scala scale file format. Otherwise try a scale from the Scala scale archive, found at the very bottom of the Scala download page. You can learn more about Scala at the Scala home page.
 This is the number of frets you would like FretFind to calculate. The number of frets must be an integer.
 The number of strings must be an integer. If you change the number of strings be sure to update the tuning section below (only useful with nonequal temperament scales).
 Enter the scale step (of the scale defined above) to which each string will be tuned. For example a standard guitar in the key of E would be tuned 0, 7, 3, 10, 5, 0. The first string is the string to the far right on the fretboard. This step is not important for the Equal calculation method. Entering a tuning for the Scala calculation method will very likely result in partial frets.
Enter your measurements
units
scale length
string width at the nut
This is the distance along the nut from the center of the first string to the center of the last string. The remaining strings are equally divided between these two points.
string width at the bridge
This is the distance along the bridge from the center of the first string to the center of the last string. The remaining strings are equally divided between these two points.
fretboard overhang
The fretboard overhang is the distance from the center of outer strings to edge of nut or bridge.
There are four input modes for overhang:
Equal: you enter a single value and the overhang will be constant.
Nut & Bridge: allows you to specify one overhang at the nut and another overhang at the bridge.
First & Last: allows you to specify one overhang for the first string and another for the last string.
All: you specify an overhang for all four locations separately.
The first string is shown on the far right
where the high E string would be on a typical righthanded guitar.
The last string is on the far left, where the low E would be found.
For fretboards with multiple scale lengths this is calculated as delta x distance,
distance measured along a line drawn perpendicular to the neck's midline.
calculation method
number of frets
number of strings
tuning
Preview
Download as file
You can Download the results in different file formats for different usage cases. For printing out the fretboard in the right size, PDF multi page is recommended.
PDF (multi page)
Always double check the printed fretboard with the mesurement data. Sometimes you might need to adjust the scale. My printer needs to print for example with just 99,6%!
Choose your paper format to print the fretboard directly
PDF (single page)
Get a PDF without site break.
DXF
DXF files are widely used in CAD programs
SVG
File with a graphical output of the fretboard
HTML
File with the calculated data to open in web browsers
CSV
This file contains the pure data to be opend in spreadsheed programs like excel.
TAB
File with the calculated data.
Link
Link to this designSave all your submissions in a Link, that will be shown as URL in browsers adress bar.
For more file types turn on the extended mode.
Calculation table
The original version is available on GitHub.