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Open D Guitar Tuner.

A full D major chord, before you fret a single note.

Tune open strings first. Fit your capo, then switch on “Check with capo on”.

Open DD A D F♯ A D
REFERENCE TONEA4 = 440 Hz
D2
D · 6th string73.42 Hz

Choose a string below to hear its note.

PLAY A STRINGThickest Thinnest
6 strings · 3 seconds each
Sound & advanced settings

A gentle ping follows a steady note within 5 cents. Its volume follows the sound slider. Microphone audio stays on your device.

Check your intonation.

Compare one open string with the same string pressed at fret 12. Remove your capo and mute the other strings.

  1. 1. Tune and measure the open string
  2. 2. Press at fret 12 and measure again

Press just behind fret 12 with normal pressure. Do not play a harmonic. Repeat the comparison to confirm the result.

Check your six strings.

Press start, then sweep gently across all six open strings, from thickest to thinnest. Let them ring together.

Experimental: overlapping notes can be unclear. Select any result to measure that string alone in this window.

Check a known reference.

Play a steady reference from another device or instrument whose frequency you know. Enter that frequency below.

This compares your input with the reference you supply. It is not a certified calibration. Only numbers are saved, never audio.
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By ear: click a note, match your string, then move to the next. Keyboard: 1–6 to play · Esc to stop

KNOW YOUR TUNING

Open D: D A D F♯ A D

Lower strings 6, 2 and 1 by a whole step, and lower string 3 from G to F sharp. Leave strings 5 and 4 unchanged. Adjust gently and check the full set again.

The table shows the open-string setup at A4 = 440 Hz. For capo pitches, use the capo controls above.

Open D notes and frequencies from thickest to thinnest
StringNoteHzFrom standard
6 · thickestD273.42E → D, down a whole step
5A2110.00A, unchanged
4D3146.83D, unchanged
3F♯3185.00G → F♯, down a half step
2A3220.00B → A, down a whole step
1 · thinnestD4293.66E → D, down a whole step

THE TUNEGUITAR GUIDE

Understand Open D

TuneGuitar guide · Updated 6 October 2026 · How we prepare our guides

Listen for F sharp in the middle

Open D contains a D-major triad: D, F sharp and A. Its major third is on string 3, which moves down one semitone from standard G. That small change is easy to overlook when the outer strings move a whole step. If the result sounds suspended, check whether you accidentally left the third string at G and made DADGAD.

Three Ds, three registers

Strings 6, 4 and 1 are D2, D3 and D4. Each is an octave above the previous one. Compare them in that order after tuning. A detector can favour a harmonic on a low string, so a D label without its octave is not enough. Select the physical string and use the target frequency as the reference.

Plan the return before a session

Returning from Open D to standard raises strings 6, 2 and 1 by two semitones and string 3 by one. Strings 5 and 4 stay put. If your next piece needs DADGAD instead, only string 3 rises, from F sharp to G. Save those two routes separately in a practice list so you do not undo the whole setup unnecessarily.

Your string-by-string route from standard

This is a comparison of target pitches, not a recommendation to use every tuning on every guitar. Start from the tuning your instrument actually has. Use the directions and the octave labels together.

Standard → Open D
StringStartTargetAdjustment
6E2D2Lower 2 semitones
5A2A2Keep this target
4D3D3Keep this target
3G3F♯3Lower 1 semitone
2B3A3Lower 2 semitones
1E4D4Lower 2 semitones

Nearby tunings, compared by their actual notes

These are the three closest six-string presets by total semitone movement from this setup. The ranking describes target changes, not playing difficulty or physical suitability. A familiar name can hide a different middle-string layout.

What changes from this tuning?
Next tuningAll target notesStrings that change
DADGADD2 · A2 · D3 · G3 · A3 · D43
Open D minorD2 · A2 · D3 · F3 · A3 · D43
D standardD2 · G2 · C3 · F3 · A3 · D45, 4, 3

READY FOR THE FIRST CHORD

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GOOD TO KNOW

Questions about Open D

How does Open D differ from DADGAD?

The third string is F sharp in Open D and G in DADGAD. That single change turns the suspended sound into a D major chord.

Which string gives Open D its major sound?

The third string, F-sharp3, supplies the major third. Check that string after establishing the D and A targets. A G there produces DADGAD; an F produces Open D minor. One semitone can change the chord’s character.

Do any strings go above their standard targets in Open D?

No. In this D A D F-sharp A D layout, strings 5 and 4 stay unchanged and the other four are lowered. If you find yourself tightening a string above its standard note, recheck the string number and target octave.

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Last updated 13 September 2026.

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