Work out guitar fret position instantly with clear inputs, formula shown and shareable results.
Equal temperament places fret n at scale length minus scale length divided by two to the power n over twelve, which is why the twelfth fret sits at exactly half the scale. Fret spacing shrinks geometrically, so the gap between frets 19 and 20 is less than a third of the gap between the nut and the first fret.
Fret position
distance from nut = L - L / 2 ^ (fret / 12)
distance from nut = L - L / 2 ^ (fret / 12). Equal temperament places fret n at scale length minus scale length divided by two to the power n over twelve, which is why the twelfth fret sits at exactly half the scale.
Fret spacing shrinks geometrically, so the gap between frets 19 and 20 is less than a third of the gap between the nut and the first fret.
Enter scale length, fret number. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.