What are the notes of Open D tuning?

D A D F# A D, from string 6 (nearest your face when you hold it) to string 1.

Can I tune without a microphone?

Yes. Tap any string in the tuner to hear its reference tone and tune by ear until the beating disappears.

Open D tuner

Open D tuning sets the strings, from string 6 to string 1, to D2, A2, D3, F#3, A3 and D4. D A D F♯ A D. Strum open for a D major. From standard tuning, tune the E string down 2 semitones to D, G string down 1 semitone to F#, B string down 2 semitones to A and E string down 2 semitones to D. Press Start, play each string and turn the peg until the needle centers.

String notes and frequencies (A4 = 440 Hz)

String 6: D2 at 73.42 Hz
String 5: A2 at 110.00 Hz
String 4: D3 at 146.83 Hz
String 3: F#3 at 185.00 Hz
String 2: A3 at 220.00 Hz
String 1: D4 at 293.66 Hz

Questions

What are the notes of Open D tuning?: D A D F# A D, from string 6 (nearest your face when you hold it) to string 1.
Can I tune without a microphone?: Yes. Tap any string in the tuner to hear its reference tone and tune by ear until the beating disappears.

Also try: Drop D tuner · Half step down tuner · Whole step down tuner · Guitar Tuner