Ever wonder how frets are spaced?
Or why they get closer and closer as they go up the fret board?
What’s known as the Rule of 18 does this which is based on work done by Pythagoras.
18 is just the rounded off number. The real number is 17.817. Your total string length (nut to bridge distance) is divided by this number and that gives you the distance from the nut to the first fret. Then the remaining distance, 1st fret to bridge, is divided by 17.817. This gives the placement of the 2nd fret. This goes on all the way up the neck making a smaller and smaller spacing each time.