What You Need Before You Start

Changing an acoustic guitar string takes about five to ten minutes per string once you have the right tools. You will need a new acoustic guitar string (the correct gauge for the string you are replacing), wire cutters, a string winder (optional but speeds up the process), and a tuner. Most people also keep a clean cloth nearby to wipe the fretboard while the strings are off.

Before you begin, decide whether you are replacing one broken string or all six at once. If you are replacing just one, you can leave the others on. If you are replacing all six, you have two choices: remove and replace them one at a time (which keeps tension on the neck), or remove all six at once and clean under them (which takes longer but lets you deep-clean the fretboard). First-time changers should replace one string at a time.

Key Takeaways

  • Loosen the tuning peg for the string you are replacing by turning it counterclockwise until the string goes slack, then unwind it completely from the peg.
  • Remove the bridge pin at the bridge end of the string by gently prying it up with a flat tool, then pull the old string out of the bridge hole.
  • Insert the new string into the bridge hole, replace the bridge pin so the groove faces the string, and wind the string around the tuning peg in a downward spiral until it is tight.
  • Tune the new string to pitch using a tuner, then gently stretch it by pulling upward on the string to help it settle and hold its tuning.
  • New strings take 24 to 48 hours to fully stabilize, so expect to retune several times before the string stops going flat.

Loosen and Remove the Old String

Start at the headstock. Locate the tuning peg (also called a tuning machine or tuning key) for the string you are replacing. On most acoustic guitars, the three bass strings (thickest) have tuning pegs on one side of the headstock, and the three treble strings (thinnest) have pegs on the other side. Turn the tuning peg counterclockwise—this loosens the string. Turn slowly and steadily until the string is completely slack and hangs loose from the bridge.

Once the string is slack, unwind it the rest of the way by hand. Most tuning pegs have a post (a small cylinder) that the string wraps around. Keep unwinding until the string pulls free from the post. The string should now be completely detached at the headstock end.

Now move to the bridge, where the string enters the body of the guitar. You will see a small wooden or plastic pin (the bridge pin) sitting in a hole at the bridge. This pin holds the string in place. Gently pry the pin upward using a flat tool—a coin, a flathead screwdriver, or the notch on a string winder all work. Do not force it; a steady, gentle rocking motion usually frees it. Once the pin is out, pull the old string straight out of the bridge hole. The string is now completely removed.

Insert the New String at the Bridge

Take your new acoustic string and insert the ball end (the small metal sphere at one end) into the bridge hole where the old string came out. Push it in until the ball end sits inside the guitar body, just below the bridge. The string should now hang straight down from the bridge hole.

Pick up the bridge pin and look at it closely. Most bridge pins have a small groove or notch running along one side. This groove should face the string you just inserted—the groove guides the string and prevents the pin from cutting into it. Slide the pin into the hole on top of the string, with the groove facing the string. Push the pin down gently but firmly until it sits flush with the bridge. You should hear a small click as it seats. The string is now locked in place at the bridge end.

Wind the String Around the Tuning Peg

Go back to the headstock and the tuning peg for this string. Pull the string taut (tight but not hard) with one hand so it runs straight from the bridge to the tuning peg post. With your other hand, begin winding the tuning peg clockwise. As you turn, the string will wrap around the post in a spiral. Keep the string tight as you wind so the wraps sit neatly next to each other without overlapping or crossing.

Wind until the string is snug and has tension, but do not crank it all the way to pitch yet. A good rule: aim for two to three complete wraps around the post for the thinner strings (treble) and three to four wraps for the thicker strings (bass). If you have a string winder, insert the peg into the winder's socket and turn the winder's handle—this does the same job much faster and with less hand fatigue. Stop winding when the string feels tight and the slack is gone.

Tune the String to Pitch

Use a tuner to bring the string up to the correct pitch. For a standard tuning, the strings from thickest to thinnest are E, A, D, G, B, and E. Clip the tuner to the headstock or hold it near the string and pluck the string. The tuner will show you whether the note is flat (too low), sharp (too high), or in tune. Turn the tuning peg clockwise to raise the pitch (make it higher) or counterclockwise to lower it (make it lower). Make small adjustments and pluck the string again after each turn until the tuner shows the correct note.

New strings go flat quickly at first—this is normal. Do not be surprised if the string drops a half-step or more within the first hour. Tune it back up and continue playing. The string will stabilize over the next 24 to 48 hours as the metal stretches and settles.

Stretch the New String

Once the string is in tune, gently stretch it to help it settle faster and hold its pitch longer. Grasp the string between your thumb and forefinger about halfway along its length and pull it upward gently but firmly—not hard enough to hurt your hand, but with real pressure. Hold for a second, then release. Move to a different spot on the string and repeat two or three times along the entire length.

After stretching, check the tuner again. The string will have gone flat slightly. Tune it back up. This stretch-and-retune cycle helps the string seat properly and reduces the number of times you will have to retune over the next day. If you are replacing all six strings, repeat this entire process for each string before you play the guitar.

Common Mistakes to Avoid

The most common error is winding the string in the wrong direction. Remember: clockwise tightens (raises pitch), counterclockwise loosens (lowers pitch). If you wind the wrong way, the string will go slack instead of tight, and you will waste time. A second mistake is forgetting to check that the bridge pin groove faces the string. If the groove faces the wrong way, the pin can cut into the string and cause it to break prematurely.

Another frequent problem is winding the string so it overlaps itself on the post. This creates kinks in the string and makes it harder to tune smoothly. Keep tension on the string as you wind so each wrap sits neatly next to the previous one. Finally, do not skip the stretching step. Strings that are not stretched will go flat repeatedly over the first few hours, and you will spend more time tuning than you saved by skipping this step.

Frequently Asked Questions

How often should I change my acoustic guitar strings?

This depends on how often you play and how hard you play. Light players who practice a few times a week might change strings every three to six months. Heavy players or those who play daily may need to change them every four to eight weeks. Strings sound duller and feel rougher as they age, and they break more easily. When you notice either of these signs, it is time for new strings.

Can I replace just one string, or do I have to replace all six?

You can replace just one. Many players replace strings as they break rather than all at once. The only downside is that a brand-new string will sound slightly brighter and feel different from the older strings around it until it ages a bit. If you want all six strings to sound and feel identical, replace them all at once, but this is not necessary.

What gauge string should I buy?

Check the packaging of your current strings or look at the original documentation that came with your guitar. Acoustic strings come in light, medium, and heavy gauges. Light strings are easier on your fingers but produce a thinner sound. Heavy strings sound fuller but are harder to press down. Stick with the same gauge your guitar came with unless you have a specific reason to change.

Why does my new string keep going flat?

New strings stretch as you play them and as the metal settles into its new shape. This is completely normal and happens to every new string. Tune it back up each time it goes flat. After 24 to 48 hours of playing, the string will stabilize and hold its pitch much better. Stretching the string by hand before you play also speeds up this process.

Do I need a string winder?

No, but it makes the job faster and easier, especially if you change strings often. A string winder costs five to fifteen dollars and turns the tuning peg for you instead of your hand doing it. If you are changing strings once or twice a year, your hand is fine. If you change them monthly or more, a winder saves time and reduces hand fatigue.