Open D tuning and tuner
In open D the open strings ring a D major chord. A big, resonant sound for folk, slide and fingerstyle, with four strings changed from standard.
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String notes: Open D (D A D F♯ A D)
At A = 440 Hz. The tuner measures each plucked string against these frequencies.
| String | Note | Frequency | vs. standard |
|---|---|---|---|
| 6. | D2 | 73.4 Hz | ↓ 2 semitones |
| 5. | A2 | 110.0 Hz | unchanged |
| 4. | D3 | 146.8 Hz | unchanged |
| 3. | F♯3 | 185.0 Hz | ↓ 1 semitone |
| 2. | A3 | 220.0 Hz | ↓ 2 semitones |
| 1. | D4 | 293.7 Hz | ↓ 2 semitones |
How to tune
- Press “Start tuning” and allow the microphone. The sound stays in your browser and is never uploaded.
- Tune down: 6th E→D, 3rd G→F♯ (a half step), 2nd B→A, 1st E→D. The 5th (A) and 4th (D) strings stay.
- The 3rd string only drops a half step. That's the major third that makes the open chord D major.
- When the needle sits in the green middle zone (±3 cents), the string is in tune. Anything within 5 cents sounds in tune to the ear.
All tuned? Here are the chords, with shapes and sound →
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Frequently asked questions
What is open D tuning?
D – A – D – F♯ – A – D. The open strings form a D major chord.
What is open D minor?
Tune the 3rd string down one more half step to F (D A D F A D) and the open chord becomes D minor.
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