Quick answer: To tune a guitar online, tap Start tuner, allow the microphone and play one open string. Turn the peg until the needle is in the green zone (within ±3 cents). Standard tuning from thick to thin is E2 82.41 Hz, A2 110 Hz, D3 146.83 Hz, G3 196 Hz, B3 246.94 Hz and E4 329.63 Hz.
How to use the online guitar tuner
- Pick your instrument and tuning. Guitar (6 or 7 string), bass (4 or 5 string), ukulele, violin, viola, cello, mandolin, banjo or chromatic, then a tuning such as Standard, Drop D, DADGAD or Open G.
- Tap Start tuner and allow the microphone. Hold your phone or laptop near the soundhole or amp.
- Play one open string and let it ring. Auto-detect lights up that string on the headstock. To tune a specific string, tap its peg: you hear the reference note and the tuner locks to it.
- Read the needle. Left (red/amber) means flat, so tighten the string; right means sharp, so loosen it. When the needle is centred and the badge turns green with a ✓, the string is in tune.
- Check the drift graph. A flat line in the green band means the string is stable. Tune each string, then check them all once more, because changing one string’s tension slightly moves the others.
Standard guitar tuning notes and frequencies
Strings are numbered from the thinnest (1) to the thickest (6). A common way to remember EADGBE: Eddie Ate Dynamite, Good Bye Eddie.
| String | Note | Scientific pitch | Frequency (A4 = 440 Hz) |
|---|---|---|---|
| 6 | E | E2 | 82.41 Hz |
| 5 | A | A2 | 110.00 Hz |
| 4 | D | D3 | 146.83 Hz |
| 3 | G | G3 | 196.00 Hz |
| 2 | B | B3 | 246.94 Hz |
| 1 | E | E4 | 329.63 Hz |
Alternate guitar tunings with frequencies
Strings listed from 6th (low) to 1st (high). Frequencies in Hz at A4 = 440 Hz. Heavier tunings may need thicker strings: check our string gauge finder.
| Tuning | 6th | 5th | 4th | 3rd | 2nd | 1st |
|---|---|---|---|---|---|---|
| Drop D | D 73.4 | A 110.0 | D 146.8 | G 196.0 | B 246.9 | E 329.6 |
| Half-step down (Eb) | E♭ 77.8 | A♭ 103.8 | D♭ 138.6 | G♭ 185.0 | B♭ 233.1 | E♭ 311.1 |
| Whole-step down (D standard) | D 73.4 | G 98.0 | C 130.8 | F 174.6 | A 220.0 | D 293.7 |
| Drop C | C 65.4 | G 98.0 | C 130.8 | F 174.6 | A 220.0 | D |