Tuning a twelve-string guitar means matching each of its six pairs of strings to the same notes as a standard six-string, with the extra strings tuned either to the same pitch or one octave higher
A twelve-string acoustic has six pairs of strings instead of six single strings. The four lowest pairs (E, A, D, and G) are tuned with one string at the standard pitch and its partner one octave higher. The two highest pairs (B and high E) are tuned to the same pitch as each other. This setup gives the twelve-string its characteristic shimmering, chorus-like sound. Tuning takes longer than a six-string because you have twice as many strings to adjust, but the process itself is identical—you are matching pitch, not learning a new technique.
The main difference between tuning a twelve-string and a six-string is understanding which strings pair together and what pitch each should reach. Once you know the layout, the tuning method is straightforward: use a tuner, match each string to its target note, and work from thickest to thinnest. New twelve-strings will drift out of tune faster than six-strings because of the extra tension, but this settles down after a week or two of playing.
Key Takeaways
- The four lowest pairs tune with one string at standard pitch and its octave partner higher; the two highest pairs tune to unison (the same pitch).
- A digital tuner designed for twelve-strings, or a standard tuner used twice per pair, removes guesswork and saves time.
- Tune the lower string of each pair first, then match its octave or unison partner by ear or with the tuner.
- Twelve-string guitars hold less stable tuning than six-strings because of string tension, so expect to retune every few days when new.
- Turning the tuning pegs slowly and checking pitch after each small turn prevents overshooting and keeps strings from breaking.
Understanding the pairing layout on a twelve-string
The six pairs run from thickest to thinnest: low E, A, D, G, B, and high E. On the low E pair, one string is tuned to E (the standard pitch), and the other is tuned to E one octave higher. The same pattern holds for A, D, and G. The B pair and high E pair are different—both strings in each pair are tuned to the same pitch, not an octave apart. This is why twelve-strings sound fuller on the bass end but brighter and more unified on the treble end.
Most twelve-strings have the octave and unison strings wound side by side on the same tuning peg, or on adjacent pegs. Check your guitar's headstock to see which string is which. Some players mark the octave strings with a dot of paint or tape so they do not mix them up during tuning. If you are unsure which string is which, pluck each one individually and listen—the octave string will sound noticeably higher.
Choosing the right tuner for a twelve-string
A digital clip-on tuner is the fastest tool for twelve-strings. It reads the vibration of the headstock and displays the note name and how far sharp or flat you are. Clip it to the headstock, tune each string, and move to the next. A standard tuner works fine—you straightforward tune all twelve strings one at a time instead of using a twelve-string-specific mode.
A tuner app on your phone works if the room is quiet enough for the microphone to hear the string clearly. Avoid tuning in noisy environments with an app; the background sound will throw off the reading. If you prefer tuning by ear, you can use a reference pitch—a tuning fork, a pitch pipe, or a recorded note—to set the first string, then match the rest to it. This method takes practice and is slower, but it trains your ear over time.
Tuning the lower four pairs (E, A, D, G) with octaves
Start with the low E pair. Tune the thicker string to E using your tuner. Once it is locked in, tune the thinner string of that pair to E one octave higher. The thinner string will sound noticeably brighter and higher. Use your tuner to confirm it is E, not a different note. Repeat this process for the A, D, and G pairs, working from thickest to thinnest.
If you are tuning by ear without a tuner, pluck the lower string (the one you just tuned), then pluck the octave string. The octave string should sound like a higher version of the same note—not a different note, just higher. If it sounds off, adjust the tuning peg slowly until the pitch matches. This takes a trained ear and is harder than using a tuner, so beginners should stick with a digital tool until they develop the skill.
Tuning the upper two pairs (B and high E) to unison
The B pair and high E pair are tuned to the same pitch, not an octave apart. Tune the first B string to B using your tuner. Then tune the second B string to B as well—it should match the first one exactly. Do the same for the high E pair: tune the first string to E, then tune the second string to E to match it.
When tuning unison pairs by ear, pluck both strings of the pair together. If they are in tune, they will blend into one clear note. If one is sharp or flat, you will hear a wavering or beating sound—a slight wobble in the pitch. Adjust the flat or sharp string until the wobble stops and the two strings sound like one. This is easier to hear than octave tuning and is a good place to start if you are learning to tune by ear.
Tuning order and technique to avoid breaking strings
Tune from the thickest string to the thinnest. This spreads the tension change across the neck gradually and is gentler on the instrument. Turn each tuning peg slowly and check the pitch after every small turn. Do not crank the peg all the way and hope you land on the right note—you will overshoot, and the string may snap.
If a string is very flat (far below pitch), bring it up slowly. If it is very sharp (above pitch), loosen it slightly and come back up to the note. This back-and-forth approach, called settling, helps the string find its stable pitch and reduces the chance of it going sharp again five minutes later. New strings take longer to settle and will drift out of tune faster than old ones, so be patient with them.
Why twelve-strings go out of tune faster and what to do about it
Twelve-strings hold tuning less stably than six-strings because they have more total string tension pulling on the neck and bridge. New strings are especially unstable—they stretch as you play, and the tuning will drift noticeably within the first few hours and days. This is normal and does not mean you tuned them wrong.
Expect to retune a new twelve-string every few days for the first week or two. After the strings settle (usually after a week of playing), the tuning will hold much longer. If your twelve-string consistently goes sharp or flat in a particular direction, the neck may have shifted slightly, and you should have a technician check the truss rod. For now, retune before each playing session and you will be fine.
Frequently Asked Questions
Do I have to tune the octave strings higher, or can I tune them lower?
Tradition and the guitar's design call for the octave strings to be higher, and that is what gives the twelve-string its sound. You can tune them lower if you want, but the guitar will sound dull and muddy instead of bright and shimmering. Stick with the octave-higher setup unless you are experimenting intentionally.
Can I use a standard six-string tuner on a twelve-string?
Yes. A standard tuner reads individual pitches, so it works on any number of strings. It will not have a twelve-string mode, but you do not need one—just tune each of the twelve strings to its target pitch one at a time. A clip-on tuner is faster because you do not have to hold it up to each string.
What if I cannot hear the difference between the octave string and the regular string?
Use a tuner. That is what it is for. Tuning by ear is a skill that takes time to develop, and there is no shame in relying on a tool. A digital tuner removes doubt and gets you in tune faster, especially when you are learning.
How often should I retune a twelve-string?
New strings need retuning every few days for the first week or two as they settle. After that, retune before each playing session or whenever you notice the pitch has drifted. If your twelve-string goes out of tune within hours of tuning, the strings may be very old or the neck may need adjustment—have a technician look at it.
Is it normal for the strings to sound slightly out of tune even after I tune them?
If the strings sound wavering or beating together, one or more may be slightly sharp or flat. Use your tuner to check each string individually. If the tuner says they are all in tune but they still sound off, the guitar may have an intonation problem—the bridge or nut may need adjustment by a technician.