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Fret Spacing Calculator

Work out every fret position for a scale length using 12-tone equal temperament. Runs locally in your browser.

nut to bridge, measured on the instrument
for the scale length and results
how many fret slots to lay out
whole number, 1–36
Enter a scale length and fret count.

Fret n sits at L × (1 − 2−n/12) from the nut, so the 12th fret falls at exactly half the scale length. Positions are theoretical slot centres with no saddle compensation or string action allowance; measure from the inside face of the nut on the real instrument and check the 12th fret against its harmonic before cutting.

Fret positions

FretFrom nutGap
Results appear here.