12th-Fret Intonation Checker
Compare your open string vs 12th fret pitch to calculate bridge saddle screw adjustments with millimeter precision.
Tune open string until 0 cents.
Read cents when pressing 12th fret.
Why Intonation Matters for Guitarists
If your open strings sound perfectly in tune but chords sound sour as you play higher up the neck, your intonation is off. Each string vibrates at a specific active length determined by the bridge saddle.
By moving the saddle forward or backward, you compensate for string thickness and downward fretting tension so every fret plays in perfect harmonic tune.