Online 7-string guitar tuner
In standard tuning, the open strings of 7-string guitar, from string 7 to string 1, are B1 E2 A2 D3 G3 B3 E4, with concert A (A4) at 440 Hz. The lowest note is B1, at 61.74 Hz, and the highest is E4, at 329.63 Hz.
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— Hz — cents
Tap “Turn on tuner” and allow the microphone.
Standard tuning
The most common 7-string guitar tuning: a regular guitar plus a low B 7th string, a fourth below the low E. Widely used in modern metal.
Notes: B1 E2 A2 D3 G3 B3 E4.
How to tune the 7-string guitar
The 7-string guitar is a regular guitar with one more string at the bottom: the 7th, a low B (B1), a fourth below the 6th-string E. Tune the top six strings as on a regular guitar and leave the 7th for last. A phone microphone picks up little of such deep notes, but the tuner recognises the note from the shape of the wave even when the fundamental is weak: bring the phone close to the amp or the body of the guitar, pick the open string firmly and wait half a second for the sound to settle, because right after the attack a low string tends to sound slightly sharp.
Notes and frequencies of each string
| String | Note | Frequency |
|---|---|---|
| 7 | B1 | 61.74 Hz |
| 6 | E2 | 82.41 Hz |
| 5 | A2 | 110.00 Hz |
| 4 | D3 | 146.83 Hz |
| 3 | G3 | 196.00 Hz |
| 2 | B3 | 246.94 Hz |
| 1 | E4 | 329.63 Hz |
How to use it
Tap “Turn on tuner”, allow the microphone and play one open string at a time. The tuner recognises the string and shows whether to tighten it (it is flat) or loosen it (it is sharp). Tap a string name to lock onto it and hear the reference note.
Frequently asked questions
What are the open-string notes of 7-string guitar in standard tuning?
From string 7 to string 1: B1 E2 A2 D3 G3 B3 E4.
What is the frequency of the lowest note in this tuning?
It is B1, at 61.74 Hz (with concert A at 440 Hz). The highest is E4, at 329.63 Hz.
How do I tune the 7-string guitar?
The 7-string guitar is a regular guitar with one more string at the bottom: the 7th, a low B (B1), a fourth below the 6th-string E. Tune the top six strings as on a regular guitar and leave the 7th for last. A phone microphone picks up little of such deep notes, but the tuner recognises the note from the shape of the wave even when the fundamental is weak: bring the phone close to the amp or the body of the guitar, pick the open string firmly and wait half a second for the sound to settle, because right after the attack a low string tends to sound slightly sharp.
Does the tuner work offline?
Yes. After the first visit (or once installed as an app), the pages open without a connection and pitch detection happens on your device.
What are cents?
A cent is one hundredth of a semitone. Up to 5 cents off is barely audible; the needle turns green in that range.
Can I change the reference A?
Yes: the − and + buttons set A4 anywhere from 430 to 450 Hz, to play along with a piano or a recording tuned differently. Your choice is saved.
Does the microphone record what I play?
No. The sound is analysed on the fly, inside the browser, and is never recorded or sent anywhere.