A 12-string guitar has six pairs of strings, and each pair must be tuned to the same note

A 12-string acoustic guitar sounds fuller and richer than a 6-string because it has two strings for each note instead of one. The pairs are tuned in unison — meaning both strings in a pair play the same pitch. The standard tuning for a 12-string follows the same note sequence as a 6-string (E, A, D, G, B, E from lowest to highest), but you are tuning 12 strings instead of 6. The two thickest pairs (the low E and A strings) are often tuned an octave apart for a richer sound, but beginners usually start with unison tuning on all pairs.

Tuning a 12-string takes longer than tuning a 6-string because you have twice as many strings to adjust. The process is the same — you match each string's pitch to a reference tone — but the extra strings mean more listening, more turning of tuning pegs, and more patience. A digital tuner makes this much faster and more accurate than tuning by ear alone.

Key Takeaways

  • A 12-string guitar has six pairs of strings tuned to the same notes as a 6-string, but with two strings per note instead of one.
  • A digital tuner is the most reliable tool for tuning a 12-string because it removes guesswork and handles the extra strings without fatigue.
  • Tune the thickest strings first, then work toward the thinnest, checking each pair twice because 12-string tension can cause strings to drift as you work.
  • New 12-string guitars and newly installed strings take longer to settle into stable tuning and may drift noticeably within the first few days.

Get a digital tuner and understand what it shows

A digital tuner is a small device that listens to each string and displays whether it is sharp (too high), flat (too low), or in tune. You can buy one for $15 to $40 at any music store or online. Clip-on tuners are the most convenient for acoustic guitar — they attach to the headstock and sense vibrations directly from the wood, so they work even in noisy rooms.

When you pluck a string, the tuner's screen will show the note name (E, A, D, G, B, or E) and a needle or light that moves left or right. Center means the string is in tune. Left (or red) means the string is flat — turn the tuning peg to tighten it and raise the pitch. Right (or green) means the string is sharp — turn the tuning peg to loosen it and lower the pitch. Tune slowly: small turns make big changes in pitch, especially on thinner strings.

Tune the low E pair first, then work upward

Start with the two thickest strings at the headstock — these are both E notes. Pluck the first low E string and watch the tuner. Turn its tuning peg slowly until the tuner shows E and the needle centers. Then pluck the second low E string (the one next to it) and tune it to match. Both should show E on the tuner and both should sound identical when plucked together.

Move to the A pair next, then D, then G, then B, then the high E pair. Tune one string in each pair, then tune its partner to match. Work from thickest to thinnest because the thicker strings are easier to hear and tune accurately. By the time you reach the thin high strings, your ear will be warmed up and you will be faster.

Check your work by tuning each pair twice

After you finish all 12 strings, go back to the low E pair and tune them again. The tension of tuning the other strings can pull the earlier ones slightly out of tune, especially on a new guitar or with new strings. Pluck the low E pair together — they should sound like one thick note, not two slightly different pitches. If one sounds higher or lower, retune it.

Work through all six pairs a second time. This second pass usually requires only small adjustments. If you find yourself making large corrections, slow down and check that you are turning the tuning peg in the right direction. Tightening raises the pitch; loosening lowers it. On most guitars, turning the peg away from you tightens the string, but this varies by headstock design — watch which way the peg turns as you adjust.

Understand why 12-strings drift out of tune faster

A 12-string guitar has 24 tuning pegs and twice the string tension of a 6-string. All that tension pulls on the neck and headstock, which means the strings can drift noticeably even after you have tuned them carefully. New strings and new guitars are especially prone to this — the strings are still stretching, and the wood is still settling.

If you just bought a 12-string or installed new strings, expect to retune it every day for the first week. This is normal. The strings will gradually hold their tuning better as they age. In the meantime, tune before you play, and do not be surprised if a string or two has drifted by the time you finish playing a song.

Tune by ear only if you have a reference tone

Tuning by ear — matching one string to another without a tuner — is possible but difficult on a 12-string because you have so many strings to compare. If you want to try it, start with one string tuned to a tuner or a reference tone (a piano, a tuning fork, or a tuning app on your phone). Then tune the rest of the strings by comparing them to that first string.

Pluck the low E string (already tuned) and then pluck the A string. Listen for the difference in pitch. Turn the A tuning peg until the A sounds right relative to the E. This method works, but it is slower and more error-prone than using a tuner, especially when you are tired or the room is noisy. A digital tuner is worth the small cost.

Know when to call a professional

If you tune all 12 strings carefully and they sound wrong together — muddy, out of phase, or like they are fighting each other — the problem may not be tuning. It could be a bent neck, a bridge that has shifted, or frets that need leveling. These are structural issues that require a guitar technician, not a tuner.

Also, if a tuning peg is hard to turn, grinding, or slipping, do not force it. A broken tuning peg or stripped post is expensive to fix. Take the guitar to a repair shop instead. A technician can also check the nut and bridge to make sure they are holding the strings in the right places, which affects tuning stability.

Frequently Asked Questions

Should I tune both strings in a pair to exactly the same pitch?

Yes, for standard unison tuning. Both strings in a pair should show the same note on the tuner and sound identical when plucked together. Some players intentionally detune one string in a pair slightly for a chorus effect, but that is a stylistic choice — start with unison tuning until you are comfortable with the instrument.

Why does my 12-string sound out of tune even though the tuner says it is in tune?

The most common cause is that one string in a pair is slightly off. Pluck each pair together and listen carefully. If you hear a wobble or wavering sound, one string is sharp or flat. Retune that string more precisely. Also check that both strings in a pair are vibrating — sometimes a string will not ring clearly if it is muted against the fretboard.

How often should I tune a 12-string guitar?

Tune before every playing session, at minimum. A 12-string drifts faster than a 6-string because of the extra tension. If you play for more than an hour, check the tuning halfway through. Temperature and humidity changes also affect tuning, so a guitar stored in a cold room may be noticeably flat when you bring it to a warm one.

Can I use a 6-string tuner on a 12-string guitar?

Yes. A tuner does not care how many strings the guitar has — it listens to one string at a time and shows you the pitch. Any digital tuner designed for guitar will work on a 12-string. The only difference is that you will be using it 12 times instead of 6.

What is the difference between tuning a new 12-string and an old one?

New strings and new guitars take much longer to stabilize. Expect a new 12-string to drift noticeably for the first week as the strings stretch and the wood settles. Retune daily during this period. An older guitar with settled strings will hold tuning much better between sessions, though it will still need tuning before you play.