Key takeaways

• String action is the height of the strings above the fretboard
• Lower action feels faster, but can cause fret buzz if set too low
• Higher action improves clarity, but can feel harder to play
• Action is affected by neck relief, bridge height, and environment
• Fender and Gibson-style bridges adjust differently
• Small adjustments make a big difference — go slow
• Knowing how to adjust string action helps keep your guitar playing its best

What is string action?

Put simply, string action is the distance between the strings and the fretboard. Specifically, it’s the gap between the strings the top of the frets, usually measured at the 12th fret.

More distance between the strings and the frets means more force required to fret a note, making it feel more difficult to play. Conversely, lower string heights make necks feel much easier and faster to play, but come with the drawback of inviting “fret buzz” – where the low string is hitting the top of a fret further down the neck.

Electric guitars tend to run with lower string actions than acoustics for a variety of reasons, the main one being that there’s less need for volume. Electric guitars rely on pickups for amplification, whereas acoustics need the strings’ vibrations to resonate with the body, thereby increasing the benefits of a higher action.

String action is one of the biggest culprits for old and unloved guitars feeling shabby and worn down. But good news for us, this can easily be fixed with just a few tools!

Equipment checklist

Before you start adjusting anything, gather a few basic tools:

• Pedal tuner
• Capo
• Small ruler (mm markings are ideal)
• Allen keys (usually supplied with your guitar)
• Screwdriver (flat or Phillips, depending on bridge)
• String winder (optional, but handy)
• Fresh strings (e.g. Ernie Ball electric guitar strings)
• Having new strings on the guitar before setting action is strongly recommended, as old or unevenly worn strings can throw off measurements

How to adjust string action

Step 1: Tune your guitar

Start by plugging your guitar into a tuner. A pedal tuner or DAW plugin works best, but you can also use a smartphone app or clip-on tuner. Next, tune each string to your desired pitch.

Check tuning throughout the process. Adjusting the neck or bridge can affect pitch, and retuning ensures your measurements stay accurate. Skipping this step is one of the most common setup mistakes.

Step 2: Check neck relief first

Before touching the bridge, check the neck relief. String action isn’t just about bridge height, but also how much relief there is in the guitar neck. Guitar necks naturally shift over time and should have a slight forward bow, which affects how high the strings sit.

Place a capo at the first fret. Hold down the low E string at the last fret and look at the gap between the string and the 7th–9th fret area. You want a very small gap, roughly the thickness of a business card.

If the neck is too bowed or too straight, adjusting the bridge won’t fix the problem properly. Neck relief is controlled by the truss rod, and any changes here should be made slowly and carefully.

Step 3: Measure your current action

Now measure the action at the 12th fret. Place your ruler on top of the fret (not the fretboard) and measure to the underside of the string.

As a rough reference:

• Low E (bass): around 2.0 mm
• High E (treble): around 1.5 mm

These aren’t rules — just starting points. Write your measurements down so you know where you began. This makes it easier to track changes and revert if needed.

Step 4: Adjust action at the bridge

Fender-style

Fender-style bridges (Stratocaster, Telecaster, and many similar modern electrics) use individual string saddles to adjust action. You do this by tightening or loosening the two (usually Allen) screws on each saddle. Your guitar is normally supplied with the correct Allen key.

Lowering the saddle reduces action (closer to the fretboard), while raising the saddle increases action (further from the fretboard).

Gibson-style

Gibson-style Tune-o-matic bridges work differently. Instead of individual saddles for height, the entire bridge raises or lowers using thumbwheels or screws on either side.

Turn both sides evenly to avoid tilting the bridge. Because this affects all strings at once, you may need to compromise slightly between bass and treble string feel.

Retune after each adjustment and recheck your measurements at the 12th fret.

Floyd Rose–style (locking tremolo)

Floyd Rose–style bridges work a little differently from fixed or Tune-o-matic bridges, as they’re floating systems held in balance by string tension and springs in the back of the guitar. Because of this, adjusting string action affects the entire setup, not just string height.

Before making any adjustments, unlock the locking nut at the headstock and tune the guitar to pitch using the fine tuners set roughly to the middle of their range. This gives you room to make tuning corrections later.

To adjust action, use the bridge pivot posts on either side of the bridge. Turning these raises or lowers the entire bridge, rather than individual strings. Make very small adjustments — around an eighth of a turn at a time — and always retune before checking your measurements again.

Once the action is set, check the bridge angle. A correctly balanced Floyd Rose should sit roughly parallel to the guitar body. If the bridge tilts forward or backwards, you’ll need to adjust the spring tension in the rear cavity to bring it back into balance.

Because Floyd Rose setups are more interconnected than other bridge types, action changes can take longer and may require some back-and-forth. Take your time, make gradual adjustments, and if you’re aiming for very low action, it’s worth considering a professional setup.

Step 6: Check for fret buzz and playability

Once your action is close, play every fret on every string. Listen for buzzing, choking notes, or dead spots.

Some light acoustic buzz can be normal and may not come through the amp. Focus on how the guitar feels and responds when played at your usual intensity.

If buzzing is severe or isolated to one area, the issue may be fret wear or uneven frets rather than string action alone. If you notice problems at this stage, recheck the bridge height or neck relief and continue making small adjustments.

Step 7: Final tweaks and settling time

After your adjustments, let the guitar sit for a bit, then retune and recheck measurements. Wood moves slowly, especially after truss rod or bridge changes.

Make final micro-adjustments if needed. Remember: action setup is iterative. You’re aiming for a balance between comfort, clarity, and consistency across the neck.

What causes string action to change?

Over time (and use), your guitar’s neck can shift and warp. Temperature and humidity are the main causes of this, and when combined with regular playing, string action can be significantly affected over long periods.

It’s particularly noticeable in humid environments or seasonal changes. Wood will naturally expand and contract in changing conditions, and this can cause issues to appear with your guitar’s setup.

String gauge and tension also matter. Heavier strings pull harder on the neck, often increasing relief and raising action slightly. Switching string brands or gauges (for example, moving to heavier Ernie Ball strings) can require a setup tweak.

General wear and tear plays a role, too. Frets wear unevenly, saddles shift, and hardware settles. All of this can slowly change how your guitar feels. Regular checks help catch issues early and keep your instrument comfortable and reliable.

Common action heights

Here’s a general reference for electric guitar action at the 12th fret:

Low action

• Low E: 1.5–1.75 mm
• High E: 1.25–1.5 mm

Medium action

• Low E: 2.0 mm
• High E: 1.5–1.75 mm

High action

• Low E: 2.25 mm+
• High E: 1.75 mm+

Lower action suits light touch and fast playing. Higher action suits heavy picking, slide, and players who want maximum clarity. Use these numbers as guidance, not strict targets.

FAQs

How do you adjust string action?

Adjust string action by tuning the guitar, checking neck relief, then raising or lowering the bridge. Fender-style bridges adjust per saddle, while Gibson-style raises or lowers the whole bridge. Make small changes, retune often, and check playability as you go.

How do you know if your string action is too high?

Your string action is likely too high if the guitar feels hard to play, chords need extra pressure, bends feel stiff, or notes go sharp when fretted. You may also notice hand fatigue or uneven volume across the fretboard.

Should action be higher at the 12th fret?

Yes. String action is normally measured at the 12th fret because it sits at the midpoint of the string. Action will be slightly higher here than near the nut, helping balance playability, sustain, and feel across the neck.

Final thoughts

We said it before, and we’ll say it again: learning how to adjust string action is one of the most empowering skills a guitarist can pick up. It helps you understand your instrument, saves time and money, and lets you fine-tune your setup to suit your hands and playing style.

Take it slow, make small adjustments, and don’t be afraid to experiment. With a bit of care, you can keep your electric guitar playing comfortably and sounding its best all year round.