How To Set Up A Guitar

The best guitar is the one you simply can’t put down. Finding that instrument is easier than you might think—and you might already own it.

Three elements make a guitar great to play: a comfortable neck with level frets, quality strings, and a proper setup. While a skilled guitar tech might be needed to deal with frets that aren’t level, most players can handle the strings and setup themselves.

Two basic adjustments—the truss rod and the bridge—are often all it takes to get a guitar playing beautifully. Most new guitars include the necessary tools (usually Allen keys), and manufacturers expect you to use them. However, you must perform these adjustments in the correct sequence to prevent them from interfering with each other:

Truss Rod: Straighten the neck.
Bridge Height: Set the string action.
Bridge Saddles: Set the intonation.

The truss rod counteracts string pull by applying opposing tension to the neck. Because different string gauges create different tensions, the rod is adjustable (usually at the nut, sometimes at the heel). Changing this tension bends the neck slightly. While this does affect string height, setting the height is the bridge’s job, not the truss rod's.

So don't use the truss rod to change the action; use it to get the neck straight and then set the action at the bridge.

Here is how to set up your guitar

1. Clean and Re-string

Remove the old strings and clean the guitar. Spray window cleaner is a good budget alternative to commercial guitar polish. For a bare wood fretboard, use a lightly damp cloth or lemon oil. Install your new strings and tune them to pitch.

2. Adjust the Truss Rod

Hold the guitar on your lap in the playing position. Place a capo on the first fret to eliminate the nut slot depth from your measurements (a pencil and elastic bands work in a pinch). Press and hold the 3rd string down at the last fret, using the string as a straight edge along the fretboard.

Check the gap under the string at the midpoint of the neck, around the 8th or 9th fret. Tap the string with your free hand to see if there is a gap or if it is already touching the fret.

The Target: Aim for a neck that is nearly straight, with a tiny gap—up to 0.5 mm, or roughly the thickness of a business card. (Note: Fast soloists often prefer a dead-straight neck for the lowest action, while players who strum open chords usually need a larger gap to prevent buzzing. Experiment to find your preference.)
Too much gap? Tighten the truss rod by turning the adjuster clockwise.
No gap (string rests on the frets)? Loosen the truss rod by turning it counter-clockwise.

Make adjustments a mere eighth of a turn at a time, re-checking the gap after each tweak.

Pro Tips: You may need to push the middle two strings aside at the nut to fit your Allen key. If your guitar has a slotted vintage Fender-style heel adjuster, loosen the strings and slightly unscrew the neck plate to tilt the neck back and access the slot. You may have to repeat this process a few times to get it right.

3. Set the Bridge Height (Action)

With the neck relief set, adjust the bridge height to set your string action. Action is measured from the top of the 12th fret to the underside of the string. A standard starting point is 1.4 mm for the high E string and 1.6 mm for the low E string, though you can adjust this based on your playing style.

Individual saddles: Set the height of the two outside strings first. Adjust the middle strings to match the curvature (radius) of the fretboard.
Fixed-radius bridges (e.g., Gibson Tune-o-matic): The curvature is pre-set; simply adjust the overall height using the posts on either side.

4. Set the Intonation

Finally, adjust the intonation so the guitar plays in tune up the neck. Use an electronic tuner for accuracy. Play an open string, then lightly fret and play the same string at the 12th fret (one octave higher).

If the 12th-fret note is flat, move the bridge saddle forward (toward the nut).
If the 12th-fret note is sharp, move the saddle backward (away from the nut).

The Ultimate Setup

If you have completed these steps but still experience buzzing or bottoming out at low actions, the nut slots may be cut poorly, or the frets may need levelling. This is common even on brand-new factory guitars.

Perfectly level frets require levelling, re-crowning, and polishing. Because this process is time-consuming and costly for a manufacturer, usually only custom-shop or professionally serviced vintage guitars receive this treatment. While a basic home setup dramatically improves playability, this "deluxe" fretwork—which requires specialist tools and a skilled guitar tech—delivers the ultimate playing experience.