12-String Guitar Tuner
Tune a 12-string guitar one string at a time with your microphone. The headstock shows all twelve strings. The four low pairs are octave pairs, and the top two are unison pairs.
- Free, no sign-up
- All 12 strings shown
- Reference tone per string
- Private, on-device
Reference pitch (A4)
Hz
Lower it in noisy rooms
Press Start tuning, then play a string
0/12 tuned
12-String Standard notes
A4 = 440 Hz| String | Note | Frequency |
|---|---|---|
| 12 | E2 | 82.41 Hz |
| 11 | E3 | 164.81 Hz |
| 10 | A2 | 110.00 Hz |
| 9 | A3 | 220.00 Hz |
| 8 | D3 | 146.83 Hz |
| 7 | D4 | 293.66 Hz |
| 6 | G3 | 196.00 Hz |
| 5 | G4 | 392.00 Hz |
| 4 | B3 | 246.94 Hz |
| 3 | B3 | 246.94 Hz |
| 2 | E4 | 329.63 Hz |
| 1 | E4 | 329.63 Hz |
Six courses, twelve strings
A 12-string guitar is tuned like a 6-string, but each string is doubled into a pair, called a course. The four low courses (E A D G) add a second string an octave higher. On the B and high E courses, both strings play the same note (a unison).
Tune one string of a pair, mute it with a finger, then tune its partner. When both match, the course sounds like one shimmering note.
Keyboard shortcuts
- Space Start or stop the microphone
- 1–9 Play a string’s reference note
- M Switch Auto / Manual mode
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Start the tuner
Press Start tuning and allow access to the microphone. Hold your 12-string guitar 20–50 cm from the mic.
-
Play one string
Pluck one string and let it ring. Auto mode shows the closest string. To stay on one string, switch to Manual.
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Adjust the tuning machine
If the needle is on the left, tighten the string to raise the pitch. If it is on the right, loosen it. Stop when the needle is in the middle and turns green.
Frequently asked questions
How is a 12-string guitar tuned?
From the 6th course to the 1st: E2/E3, A2/A3, D3/D4, G3/G4, B3/B3 and E4/E4. The low four courses are octave pairs and the top two are unisons.
Can a tuner hear both strings of a pair at once?
Not reliably. Pluck and tune one string at a time and mute the other with a fingertip.
Should a 12-string guitar be tuned down?
Many players tune a half or whole step down to reduce the extra tension of twelve strings. Tune both strings of each course to the lower note, and keep the octave strings an octave higher.
All guitar tunings
Standard & down-tuned
Drop
Open
Alternate
7-string
8-string
12-string & guitalele
More tuners
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- Violin Tuner G D A E with bowed reference tones. G D A E
- Viola Tuner C G D A, a fifth below the violin. C G D A
- Cello Tuner C G D A, an octave below the viola. C G D A
- Double Bass Tuner Upright bass in orchestral and solo tuning. E A D G
- Banjo Tuner Open G, double C, sawmill, tenor and Irish tenor. G D G B D
- Mandolin Tuner Mandolin, mandola and octave mandolin. G D A E
- Chromatic Tuner Any instrument or voice, with B♭/E♭/F transposition.
Music tools
- Metronome Accurate online metronome with accents and subdivisions.
- Tone Generator Play any frequency from 20 Hz to 20 kHz.
- Tuning Fork 415, 432, 440, 442 and 444 Hz forks.
- Pitch Detector See the exact note and frequency you play. C
- Custom Tuning Tuner Build any tuning with 3 to 12 strings. E A D G B E
- Tune Guitar by Ear Repeating reference notes for every string. E A D G B E