A variety of different tunings may be used. However, the most common by far is known as "Standard Tuning," which has the strings tuned from a low E, to a high E, traversing a two octave range – EADGBE.
The pitches are as follows:
| String | Scientific pitch | Helmholtz pitch | Interval from middle C | Frequency |
|---|---|---|---|---|
| first | E4 | e' | major third above | 329.6 Hz |
| second | B3 | b | minor second below | 246.92 Hz |
| third | G3 | g | perfect fourth below | 196.0 Hz |
| fourth | D3 | d | minor seventh below | 146.8 Hz |
| fifth | A2 | A | minor tenth below | 110 Hz |
| sixth | E2 | E | minor thirteenth below | 82.4 Hz |
The table below shows pitch names found over the six strings of a guitar in standard tuning, from the nut (zero), to the twelfth fret.
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| E | F | F♯ | G | A♭ | A | B♭ | B | C | C♯ | D | E♭ | E |
| B | C | C♯ | D | E♭ | E | F | F♯ | G | A♭ | A | B♭ | B |
| G | A♭ | A | B♭ | B | C | C♯ | D | E♭ | E | F | F♯ | G |
| D | E♭ | E | F | F♯ | G | A♭ | A | B♭ | B | C | C♯ | D |
| A | B♭ | B | C | C♯ | D | E♭ | E | F | F♯ | G | A♭ | A |
| E | F | F♯ | G | A♭ | A | B♭ | B | C | C♯ | D | E♭ | E |
A guitar using this tuning can tune to itself using the fact, with a single exception, that the 5th fret on one string is the same note as the next open string; that is, a 5th-fret note on the sixth string is the same note as the open fifth string. The exception is the interval between the second and third strings, in which the 4th-fret note on the third string is equivalent to the open second string.
Standard tuning has evolved to provide a good compromise between simple fingering for many chords and the ability to play common scales with minimal left hand movement. Uniquely, the guitar's tuning allows for repeatable patterns which also facilitates the ease in which common scales can be played[14]. There are also a variety of commonly used alternate tunings – most of which are open tunings that create entire chord voicings without fretting any strings. Many open tunings, where all of the strings are tuned to a similar note or chord, are popular for slide guitar playing. Alternate tunings are used for two main reasons: the ease of playing and the variation in tone that can be achieved.
Many guitarists use a long established, centuries-old tuning variation where the lowest string is 'dropped' two semi-tones down. Known as Drop-D (or dropped D) tuning it is, from low to high, DADGBE. This allows for open string tonic and dominant basses in the keys of D and D minor. It also enables simple fifths (powerchords) to be more easily played. Eddie Van Halen sometimes uses a device known as a 'D Tuna,' the patent for which he owns. It is a small lever, attached to the fine tuner of the 6th string on a Floyd Rose tremolo, which allows him to easily drop that string's tuning to a D. Many contemporary rock bands detune all strings by several semi-tones, making, for example, Drop-C or Drop-B tunings, However this terminology is inconsistent with that of "drop-D" as "drop-D" refers to dropping a single string to the named pitch. Often these new tunings are also simply referred to as the "Standard" of the note in question e.g. – "D Standard" (DGcfad').
Some guitarists tune in straight fourths, avoiding the major third between the third and second strings. While this makes playing major and minor triads slightly more difficult, it facilitated playing chords with more complicated extended structures[citation needed]. One proponent of the straight fourth tuning (EADGCF) is Stanley Jordan.
As with all stringed instruments a large number of scordatura are possible on the guitar. A common form of scordatura involves tuning the 3rd string to F# to mimic the standard tuning of the lute, especially when playing renaissance repertoire originally written for the lute.
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