Google and read: http://www.stewmac.com/scalelength.html
It's from the nut to the bridge thimble holes.
Scale length is the length of open ringing string on the instrument.
Section between the bridge ant the tailpiece is not ringing to produce sound (on Mustang/Jagstang).
How come you feel a need to create a new thread for every simple question you have? You're new to the internet and forums?
