Perfect Pitch Lab
Free tool

Open G guitar tuner

Tune your open G guitar to open G tuning (D G D G B D) with your microphone, or by ear with the reference tones.

–
Press Start and allow the microphone
−50 cents · flat0 centssharp · +50 cents
Reference
Reference tones
Play a string to see the closest target

Open G guitar open G tuning: D G D G B D

This open G guitar tuner listens through your microphone and shows the closest string, how many cents you are from it, and whether to tighten or loosen. Tap any string's button to hear its reference tone and tune by ear instead.

String (top to bottom)NoteFrequency
1D273.42 Hz
2G298.00 Hz
3D3146.83 Hz
4G3196.00 Hz
5B3246.94 Hz
6D4293.66 Hz

Tips for tuning a open G guitar

Open G is a favourite for slide guitar and blues: strumming the open strings plays a G major chord. Lower the 6th, 5th and 1st strings by a whole step from standard.

Tune in a quiet room, play one string at a time, and let it ring past the initial attack before you read the needle. Within ±5 cents is in tune for almost any purpose. Your audio is analysed in your browser and never uploaded.

Prefer a different instrument? See the chromatic tuner or any of the tuners below.

Questions

What are the notes of a open G guitar in open G tuning?

From the lowest string: D2 (73.42 Hz), G2 (98.00 Hz), D3 (146.83 Hz), G3 (196.00 Hz), B3 (246.94 Hz), D4 (293.66 Hz).

How do I tune a open G guitar without a tuner?

Tap each string's reference tone on this page and adjust the peg until the string matches it. When two notes are almost the same you'll hear a slow wobble; it disappears when they match.

Does the tuner work on my phone?

Yes. Open the page in your phone's browser, allow the microphone and hold the phone close to the instrument.

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