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Eighteen Rules is web application designed to help guitar makers and luthiers calculate fret distances using the Rule of 18.
It was designed for my guitarist and luthier friend Dr. James Buckland.
You can visit the Eighteen Rules site at "http://humaneguitarist.org/eighteenrules/".
You can download the source code for Eighteen Rules here.
A demonstration video on using the application can be seen here or you can view the embedded video below.
The Eighteen Rules application is built on top of a simple JSON API.
The API accepts three parameters:
- scale_length: float[1, 1000]
- total_frets: int[1, 1000]
- rule_of: float[1, 1000]
You can optionally add the "callback" parameter if you need to use JSONP.
Here are two examples, the first without the callback:
What unit of measurement is assumed for the fret calculation?
None. Because the calculation is a mathematical function, there's no assumed unit of measurement for scale length, etc.
Can I save my results after using the calculator?
You can save your results by printing them to paper or PDF, etc. You can also bookmark the results page.
Can I export the results from the calculator into a spreadsheet program such as Microsoft Excel?
Exporting the results is not possible, but you should be able to copy/paste the tabular results directly into a spreadsheet application.