9-String Guitar Tuning

Mic off

9-string standard C♯ F♯ B E A D G B E

Uses your microphone. Nothing is recorded or sent anywhere.

Tuning

Pitch

Normal

Strings

Detect string

A4 calibration

440Hz
  • Space Start / stop
  • 1-9 Play a string
  • A Auto detect

Standard tuning on a 9-string guitar is C# F# B E A D G B E: six-string standard with low B, F# and C# strings added underneath.

What is 9-string standard tuning?

Each added string sits a fourth below the one above it, so the 7th string is B, the 8th is F# and the 9th is C#. The lowest note is around 35 Hz, lower than the open strings of most bass guitars.

Strings that low take a moment to settle, so pluck firmly and let them ring. The tuner switches to its low-range mode when Strings is set to 9 and listens all the way down to about 30 Hz.

9-string standard tuning notes

9-string standard from the thickest string to the thinnest is C♯ F♯ B E A D G B E. The frequencies are for standard pitch, A4 = 440 Hz.

StringNoteFrequency
9th (thickest)C♯134.65 Hz
8thF♯146.25 Hz
7thB161.74 Hz
6thE282.41 Hz
5thA2110.00 Hz
4thD3146.83 Hz
3rdG3196.00 Hz
2ndB3246.94 Hz
1st (thinnest)E4329.63 Hz

How to tune to 9-string standard

Tune each open string to the notes above, from the thickest string to the thinnest.

The tuner at the top of this page is already set to 9-string standard. Press the mic button, play each open string and let it ring, then turn the tuning peg until the string lights up green. Tune up slowly, a little at a time, and give the string a moment to settle.

Why guitarists use 9-string standard

  • An enormous range, from bass notes to normal guitar highs.
  • Room for extreme low riffs and huge chord voicings.
  • Drop B is only one string away.

Other guitar tunings

Drop DD A D G B E Half step downE♭ A♭ D♭ G♭ B♭ E♭ D standardD G C F A D Drop CC G C F A D Drop C#C♯ G♯ C♯ F♯ A♯ D♯ Drop BB F♯ B E G♯ C♯ DADGADD A D G A D Open GD G D G B D Open DD A D F♯ A D Open EE B E G♯ B E Open CC G C G C E 7-string standardB E A D G B E 7-string Drop AA E A D G B E 8-string standardF♯ B E A D G B E

Back to the online guitar tuner

9-string standard tuning FAQ

How do I tune to 9-string standard tuning?

Play each open string, from the thickest to the thinnest, and turn its tuning peg until the tuner lights up green. The notes are C# F# B E A D G B E from low to high.

Can a tuner really hear a 35 Hz string?

Yes, this one listens down to about 30 Hz when Strings is set to 7, 8 or 9. Laptop and phone microphones are weak at very low notes, so play the low strings firmly or use a better mic if it struggles.