Open G tuning
D G D G B D · the tuner below is already set to Open G. Tap Start tuner and play a string.
Play a string
Tune with your microphone
We listen through your microphone to hear the pitch. Audio stays on this device: nothing is recorded or sent.
Allow the microphone
Your browser is asking for permission. Choose “Allow” in its prompt and the tuner starts listening.
The microphone is blocked
The browser did not let the tuner hear you. You can allow it again in a few taps, or tune by ear with the reference notes.
Chrome or Edge on a computer
Click the icon to the left of the address bar (a slider or a padlock), switch Microphone to Allow, then reload the page.
Safari on a Mac
Open Safari › Settings for This Website (or Safari › Settings › Websites › Microphone), set this site to Allow, then reload.
iPhone or iPad
Open Settings › Safari › Microphone and choose Ask or Allow. In Chrome for iOS: Settings › Chrome › Microphone. Then come back and tap Try again.
Android
Tap the icon next to the address, open Permissions and allow Microphone. If it is still blocked, open Android Settings › Apps › Chrome › Permissions › Microphone.
Firefox
Click the microphone icon with a slash in the address bar, remove the block for this site, then reload the page.
No microphone found
Plug in a headset or use a phone or laptop with a built-in microphone. Until then, the reference notes let you tune by ear.
Another app is using the microphone
Close the call, recorder or other tab that holds the microphone, then try again.
The microphone needs a secure page
Browsers only open the microphone on https pages. Open this page via https to use the tuner.
All strings in tune. Happy playing!
Reference notes
Tap a note, play the same string and turn the peg until the two sounds stop “beating” against each other.
Notes and frequencies in Open G
| String | Note | Frequency (Hz) | MIDI | From standard |
|---|---|---|---|---|
| 6 | D₂ | 73.42 | 38 | −2 |
| 5 | G₂ | 98.00 | 43 | −2 |
| 4 | D₃ | 146.83 | 50 | · |
| 3 | G₃ | 196.00 | 55 | · |
| 2 | B₃ | 246.94 | 59 | · |
| 1 | D₄ | 293.66 | 62 | −2 |
Frequencies in equal temperament with A4 = 440 Hz. If you calibrate A4, the tuner shifts every target with it.
From standard tuning to Open G
- Lower string 6 from E₂ to D₂: a whole step down.
- Lower string 5 from A₂ to G₂: a whole step down.
- Lower string 1 from E₄ to D₄: a whole step down.
- Leave strings 4, 3, 2 as they are.
- Check every string once more with the tuner: changing the tension of some strings pulls the others slightly.
About Open G
Open G tunes the guitar so that the open strings sound a G major chord: D G D G B D. Any straight bar across one fret then gives a major chord, which makes it the favourite tuning for slide guitar and for the rhythm-guitar style heard in many classic rock songs (often with the 6th string removed). Only three strings change from standard: the 6th, 5th and 1st are each lowered a whole step, from E A E to D G D.
Tuning tips
Strings need a little time to settle into Open G. Tune every string once, play for a minute, then tune them all again: the second pass is usually only a few cents and holds much longer.
Use Auto mode: the tuner already knows the notes of Open G and picks the nearest string. If a string is far off, tap its chip to lock it in Manual mode, then turn the peg until the needle centres.