Fret Position Calculator

Your details

Select a common instrument to pre-fill the scale length, or choose Custom to enter any value.
The vibrating string length from the nut to the bridge saddle. Typically measured in millimetres for classical instruments or inches for electric guitars.
mm
How many frets to show in the position table.
The fret shown in the main result card. The 12th fret is always exactly half the scale length.
Nut to fret
323.85mm

Distance from the nut to the spotlight fret slot

Fret to bridge323.85mm
Slot width19.26mm
12th fret position323.85mm
1st fret position36.35mm
Scale length (effective)647.7mm
323.85
  • Nut
  • 12th fret (octave)
  • Bridge

Fret 12 position: 323.85 mm from the nut

  • The 12th fret (octave) sits 323.85 mm from the nut and 323.85 mm from the bridge saddle.
  • The 1st fret is 36.35 mm from the nut. Fret spacing gets progressively narrower toward the body: at fret 12 the gap is 19.26 mm.
  • Fret 12 is at 50.0% of the scale length from the nut, which is the correct position in any equal-tempered tuning.

Next stepWhen routing fret slots, work from the nut end toward the body and double-check the 12th fret against half your scale length - any accumulated error shows up there first.

 = Powered by OnlyCalculators