Adim is a diminished chord, and on the guitar it is played from the notes A, C, D#. Its first guitar voicing is the movable voicing: low E string at fret 5 (middle finger); A string open; D string at fret 7 (little finger); G string at fret 5 (ring finger); B string at fret 4 (index finger); high e string at fret 5 (little finger). This page is a complete reference for it: notes and intervals, fingerings, mistakes to avoid, the keys it belongs to and a short practice routine.
What notes are in the Adim chord?
The Adim chord is a diminished chord, and its notes are fixed: A, C, D#. Every voicing on every instrument uses these same notes, in some order and in some octave — change one of them and you are playing a different chord. The table below lists each note with its interval from the root A, so you can see the structure of Adim at a glance. On the guitar, the movable voicing voicing is the place to hear it in Adim.
| Note | Interval |
|---|---|
| A | Root |
| C | b3 |
| D# | b5 |
The root is A, the note the chord is named after and the note your ear hears as home. Above it, the intervals in Adim are b3, b5. Once you know the intervals, you can build Adim from any root by counting the same semitone steps, which is how the chord works in every key. On the guitar, the notes appear in the order the fingering dictates, but the set of notes never changes.
Adim sounds eerie and compressed, a chord built from two minor 3rds stacked on each other. That character comes straight from the intervals above, not from the instrument: the same notes on piano, guitar or ukulele carry the same colour, even though the voicing changes. On the guitar, start with the first voicing above and listen for the notes A, C, D# in Adim.
Comparing Adim with its closest relatives helps to fix it in your ear. In short, diminished against minor: both have the minor 3rd C, but Adim flattens the 5th to D# where the minor chord keeps the perfect 5th E. Play both chords slowly, one after the other, and notice which note moves. Naming that note out loud while you play is the fastest way to learn the difference. On the guitar, start with the first voicing above and listen for the notes A, C, D# in Adim.
How to play Adim on guitar
On the guitar, Adim has 3 voicings in the data below, and each one uses the same notes — A, C, D# — in a different place on the neck. The first voicing below is the one to learn first, and the alternatives cover the rest of the neck. Finger numbers below use 1 for the index finger, 2 for the middle finger, 3 for the ring finger and 4 for the little finger, and x means the string is not played.
The movable voicing puts Adim in around fret 4: low E string at fret 5 (middle finger); A string open; D string at fret 7 (little finger); G string at fret 5 (ring finger); B string at fret 4 (index finger); high e string at fret 5 (little finger). The stretch is the challenge: the fretted notes span from fret 4 to fret 7, so keep your thumb low behind the neck and let your fingers reach rather than squeezing the neck. Strum or pluck it slowly first and check that every note in Adim — A, C, D# — sounds, with no buzz and no accidental open string.
Another way to play Adim is the barre chord, in around fret 5: low E string at fret 5 (index finger); A string at fret 6 (middle finger); D string at fret 7 (ring finger); G string at fret 5 (index finger); B string muted; high e string at fret 5 (index finger). It barres across strings 1 to 6 at fret 5 with the index finger. The barre is the hard part: the index finger must press every string from 1 to 6 evenly at fret 5, so roll it slightly onto its bony side and keep it close to the fret wire. If the barre buzzes, move it a fraction closer to the fret and press from the arm, not the thumb alone. Strum or pluck it slowly first and check that every note in Adim — A, C, D# — sounds, with no buzz and no accidental open string.
The movable voicing puts Adim in around fret 4: low E string at fret 5 (middle finger); A string at fret 6 (little finger); D string at fret 7 (little finger); G string at fret 5 (ring finger); B string at fret 4 (index finger); high e string at fret 5 (little finger). The stretch is the challenge: the fretted notes span from fret 4 to fret 7, so keep your thumb low behind the neck and let your fingers reach rather than squeezing the neck. Strum or pluck it slowly first and check that every note in Adim — A, C, D# — sounds, with no buzz and no accidental open string.
Choosing between the voicings of Adim is a musical decision, not a right-or-wrong one. The open or low-position voicing rings the most and suits strumming, while a barre or movable voicing lets you slide Adim up the neck to any key without changing the shape. When you change chords, pick the voicing of Adim that sits closest to the chord before it — shorter moves between shapes mean faster, cleaner changes. Practise the change into Adim from the chord that comes before it in your song, not the chord on its own, because the move is the skill. On the guitar, start with the first voicing above and listen for the notes A, C, D# in Adim.
A short practice routine for Adim on the guitar: play the first voicing four times slowly, checking each note, then change to it from the chord a fourth above A and back, four times, at a slow tempo. Then play the second voicing the same way. If a note buzzes, stop and fix the finger placement rather than playing through the buzz — clean notes at a slow tempo become clean notes at full tempo, while buzzes practised fast become habits. Use the Guitar Chord Finder to see the diagram for Adim while you practise, and the Chord Finder to compare it with the same chord on other instruments.
Common mistakes
These are the mistakes that most often make Adim sound wrong on the guitar, and each one has a concrete fix. Work through them one at a time rather than trying to fix everything at once.
Voicing it too low. A diminished triad low down sounds muddy because its notes are close together. Use a higher voicing or spread the notes across octaves. On the guitar, start with the first voicing above and listen for the notes A, C, D# in Adim.
Confusing it with the half-diminished 7th. The half-diminished chord adds a flattened 7th to this triad. Adim on its own has only three notes: A, C, D#. On the guitar, start with the first voicing above and listen for the notes A, C, D# in Adim.
Barre collapsing on the high strings. In a barre voicing of Adim, the high strings are the ones that buzz first, because the index finger presses hardest near the thumb. If the top notes of Adim sound dead, roll the barring finger slightly toward the fret and press from the arm, not from squeezing the neck. On the guitar, the movable voicing of Adim puts those notes under your fingers in the order the fingering lists them.
Playing a perfect 5th. If the 5th is E instead of D#, the chord is minor, not diminished. The flattened 5th is the note that defines this chord. On the guitar, the movable voicing voicing is the place to hear it in Adim.
Where Adim is used
As a diatonic chord, Adim belongs to the key of A# major, the key of G minor. In those keys it is one of the seven chords built from the key's own notes, so it fits without any chromatic notes. a passing chord between two diatonic chords, often used to add chromatic movement. That is the practical meaning of belonging to a key: the chord sounds settled there, and the other chords of the key lead to it and away from it naturally. On the guitar, start with the first voicing above and listen for the notes A, C, D# in Adim.
Because Adim is an extended or altered chord, it appears in progressions as a colour or a dominant rather than as a diatonic staple. Try it in place of the plain A triad in a progression you already know, and listen to how the extra notes change the feel — that substitution is the usual way extended chords enter real music. The Chord Progression Builder lets you try Adim in a progression in any key and hear how it connects to the chords around it. On the guitar, the movable voicing of Adim puts those notes under your fingers in the order the fingering lists them.
The same chord on other instruments is covered in Adim on piano, Adim on ukulele, Adim on bass, and the scales that fit over it are the A major scale and the A minor pentatonic scale. Learning Adim on the guitar and then checking it on another instrument is one of the best ways to fix the notes — A, C, D# — in your memory, because the notes stay the same while everything else changes.
Practising Adim
A short worked example makes Adim concrete. Play the four-chord progression A# – F – Gm – D# in A# major, where Adim is diatonic: A# – F – Gm – D#. Play each chord for one bar at a slow tempo, and listen to how Adim sounds in that sequence — whether it feels like home, like a lift, or like a chord on its way somewhere else. Then play the same four chords in a different order, starting on Adim itself, and notice how its character changes when it opens the progression instead of sitting inside it. On the guitar, the movable voicing of Adim puts those notes under your fingers in the order the fingering lists them.
For a second exercise, play Adim and then the chord a fourth above A, back and forth, four times each. That move — a chord and the chord a fourth above it — is the most common resolution in Western music, and it is the move Adim is built for when it acts as a dominant. Finish by playing Adim on its own, slowly, and naming each note out loud as you play it: A, C, D#. Naming the notes while you play them is what turns a shape into knowledge you can use in any key. Test yourself with the Practice Chord Quiz and keep time with the Metronome as the tempo rises. On the guitar, the movable voicing of Adim puts those notes under your fingers in the order the fingering lists them.
Frequently asked questions
What is the easiest voicing of Adim on the guitar?
The movable voicing is the easiest voicing listed for Adim on the guitar: frets 5–0–7–5–4–5, fingers 2–0–4–3–1–4. Learn that shape first, get every note ringing cleanly, and only then move on to the alternative voicings further up the neck.
Why does Adim sound tense?
Its 5th is flattened to D#, a tritone above the root A. The tritone is the most unstable interval in Western music, and it makes the chord want to resolve. On the guitar, the first voicing above shows where that note sits.
What notes are in Adim?
Adim contains A, C, D#: the root A, the minor 3rd C and the diminished 5th D#. It is two minor 3rds stacked — A to C, then C to D#. On the guitar, the first voicing above shows where that note sits.
Where is Adim used?
Most often as the vii° chord in a major key, leading to the tonic, and as a passing chord between two chords a whole step apart. It also substitutes for a dominant 7th chord. On the guitar, the first voicing above shows where that note sits.
How do you play Adim on the guitar?
The first voicing is the movable voicing: frets 5–0–7–5–4–5, fingers 2–0–4–3–1–4, on the guitar. That voicing uses the notes A, C, D#, and it is the one to learn first. The page above lists more voicings for Adim, so you can choose the shape nearest the chords around it.