Guitar tuning · also P4 tuning
Guitar All Fourths (E A D G C F) Tuning
Perfect fourths across every string so chord and scale shapes never shift. Popular with jazz players.
String pitches & frequencies
| String | Note | Frequency | MIDI | Interval to next | |
|---|---|---|---|---|---|
| 6 | E2 | 82.41 Hz | 40 | perfect fourth | |
| 5 | A2 | 110.00 Hz | 45 | perfect fourth | |
| 4 | D3 | 146.83 Hz | 50 | perfect fourth | |
| 3 | G3 | 196.00 Hz | 55 | perfect fourth | |
| 2 | C4 | 261.63 Hz | 60 | perfect fourth | |
| 1 | F4 | 349.23 Hz | 65 | — |
Strings listed 6 → 1 (low E to high E). Frequencies at A4 = 440 Hz, equal temperament.
Fretboard note map
| String | Open | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | F | F♯ | G | G♯ | A | A♯ | B | C | C♯ | D | D♯ | E | F |
| 2 | C | C♯ | D | D♯ | E | F | F♯ | G | G♯ | A | A♯ | B | C |
| 3 | G | G♯ | A | A♯ | B | C | C♯ | D | D♯ | E | F | F♯ | G |
| 4 | D | D♯ | E | F | F♯ | G | G♯ | A | A♯ | B | C | C♯ | D |
| 5 | A | A♯ | B | C | C♯ | D | D♯ | E | F | F♯ | G | G♯ | A |
| 6 | E | F | F♯ | G | G♯ | A | A♯ | B | C | C♯ | D | D♯ | E |
How to tune to All Fourths (E A D G C F)
- Open the chromatic tuner (or play each reference tone above).
- Start from the lowest string and tune each one to E2, A2, D3, G3, C4, F4.
- Tune up to each pitch: if you overshoot, drop below and come back up so the string settles.
- Check every string once more — changing the tension of one string slightly pulls the others.
Frequently asked questions
What are the notes of All Fourths (E A D G C F) tuning?
E2 (82.41 Hz), A2 (110.00 Hz), D3 (146.83 Hz), G3 (196.00 Hz), C4 (261.63 Hz), F4 (349.23 Hz).
How do I tune a guitar to All Fourths (E A D G C F)?
Tune each string to the pitches above with a chromatic tuner, starting from the lowest string; then re-check, because changing one string's tension slightly detunes the others.