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How to tune a guitar in Open D
Open D (D–A–D–F♯–A–D) turns the open strings into a D major chord, great for slide, folk and big ringing strums.
Notes
| # | Note | Frequency (A4 = 440) |
|---|---|---|
| 1 | D2 | 73.42 Hz |
| 2 | A2 | 110.00 Hz |
| 3 | D3 | 146.83 Hz |
| 4 | F#3 | 185.00 Hz |
| 5 | A3 | 220.00 Hz |
| 6 | D4 | 293.66 Hz |
Step by step
- Allow microphone access when your browser asks (audio stays on your device).
- Play one note and let it ring. The tuner detects which string or note you are playing.
- Follow the needle: left means flat (tighten / raise), right means sharp (loosen / lower).
- When the note turns green you are within ±3 cents. Move on to the next one.
Pro tip
Lower strings 1, 2 and 6 a whole step and string 3 a half step.
Frequent questions
Is this tuner free?
Yes. It runs in your browser with no download or account.
Is my audio recorded?
No. The sound is analysed on your device and never uploaded.
What is A4 = 440 Hz?
The reference pitch for the note A above middle C. Some orchestras use 442 Hz and early-music groups 415 Hz; you can change it.
Tune other instruments
Guitar Tuner
E2 · A2 · D3 · G3 · B3 · E4
Bass Tuner
E1 · A1 · D2 · G2
Ukulele Tuner
G4 · C4 · E4 · A4
Violin Tuner
G3 · D4 · A4 · E5
Cello Tuner
C2 · G2 · D3 · A3
Banjo Tuner
G4 · D3 · G3 · B3 · D4
Flute Tuner
A4 · Bb4 · F4
Alto sax Tuner
C4 · F4 · Bb4
Trumpet Tuner
Bb3 · F4 · Bb4
Clarinet Tuner
Bb3 · F4 · Bb4
Timpani Tuner
D2 · G2 · C3 · E3
Drum kit Tuner
G2 · C3 · F3 · A#3
Handpan Tuner
D3 · A3 · Bb3 · C4 · D4 · E4
Charango Tuner
G4 · C5 · E5 · A4 · E5
Venezuelan cuatro Tuner
A3 · D4 · F#4 · B3
Guitar in Drop D Tuner
D2 · A2 · D3 · G3 · B3 · E4
Guitar in Open G Tuner
D2 · G2 · D3 · G3 · B3 · D4
Guitar in DADGAD Tuner
D2 · A2 · D3 · G3 · A3 · D4
Guitar half a step down Tuner
Eb2 · Ab2 · Db3 · Gb3 · Bb3 · Eb4