Every chord, one page each

108 chords: the nine most common chord types on all twelve roots. Each page gives the spelled notes, the interval formula, a piano diagram, guitar shapes you can play, the inversions and their names, and where the chord sits in a key, with a button to hear it. Every name and note on these pages comes from the same engine that names what you play on the chord finder, and every guitar shape is checked by it before the page is written.

Root	major	minor	7	maj7	m7	dim	aug	sus2	sus4
C	C	Cm	C7	Cmaj7	Cm7	Cdim	Caug	Csus2	Csus4
Db / C#	Db	C#m	Db7	Dbmaj7	C#m7	C#dim	Dbaug	Dbsus2	Dbsus4
D	D	Dm	D7	Dmaj7	Dm7	Ddim	Daug	Dsus2	Dsus4
Eb / D#	Eb	Ebm	Eb7	Ebmaj7	Ebm7	D#dim	Ebaug	Ebsus2	Ebsus4
E	E	Em	E7	Emaj7	Em7	Edim	Eaug	Esus2	Esus4
F	F	Fm	F7	Fmaj7	Fm7	Fdim	Faug	Fsus2	Fsus4
F# / Gb	F#	F#m	F#7	Gbmaj7	F#m7	F#dim	Gbaug	F#sus2	F#sus4
G	G	Gm	G7	Gmaj7	Gm7	Gdim	Gaug	Gsus2	Gsus4
Ab / G#	Ab	G#m	Ab7	Abmaj7	G#m7	G#dim	Abaug	Absus2	Absus4
A	A	Am	A7	Amaj7	Am7	Adim	Aaug	Asus2	Asus4
Bb / A#	Bb	Bbm	Bb7	Bbmaj7	Bbm7	A#dim	Bbaug	Bbsus2	Bbsus4
B	B	Bm	B7	Bmaj7	Bm7	Bdim	Baug	Bsus2	Bsus4

The nine types, shown on C

Chord	Type	Formula	Semitones	Notes
C	major	1 3 5	0 4 7	C E G
Cm	minor	1 b3 5	0 3 7	C Eb G
C7	dominant seventh	1 3 5 b7	0 4 7 10	C E G Bb
Cmaj7	major seventh	1 3 5 7	0 4 7 11	C E G B
Cm7	minor seventh	1 b3 5 b7	0 3 7 10	C Eb G Bb
Cdim	diminished	1 b3 b5	0 3 6	C Eb Gb
Caug	augmented	1 3 #5	0 4 8	C E G#
Csus2	suspended second	1 2 5	0 2 7	C D G
Csus4	suspended fourth	1 4 5	0 5 7	C F G

The formula counts scale steps of the major scale on the root: 3 is the major third, b3 a minor third, b7 the minor seventh, #5 a raised fifth. Semitones count keys on the piano from the root, black and white alike. To build any of these chords on another root, count the same semitones up from it.

Why C#m but Db

A black-key root has two names. The engine spells each chord from the root name whose notes need the fewest sharps and flats, one letter per chord tone. On a black key the winner can change from one type to the next on the same root: Db, Db7, Dbmaj7, Dbaug, Dbsus2, Dbsus4 but C#m, C#m7, C#dim; F#, F#m, F#7, F#m7, F#dim, F#sus2, F#sus4 but Gbmaj7, Gbaug. The other spelling is shown on each page, for example C#m is also written Dbm (Db Fb Ab): the same keys, harder to read.

Finding the barre shapes

The guitar diagrams use the two movable barre grips plus the standard open shapes. For an E-shape chord, put the root on the low E string; for an A-shape chord, on the A string. The fret for each root:

Root	C	Db	D	Eb	E	F	F#	G	Ab	A	Bb	B
E-shape fret	8	9	10	11	0	1	2	3	4	5	6	7
A-shape fret	3	4	5	6	7	8	9	10	11	0	1	2

Fret 0 is the open E or A chord. Sus2 has no comfortable E-shape grip within four frets, so its pages show the A-shape and, on D, the open shape.

What these pages do not cover

Only the nine types above. Sixths, ninths, diminished sevenths, half-diminished and altered chords are named by the chord finder but do not have pages yet.
Guitar shapes are for standard tuning only, and each page shows at most three grips, not every voicing on the neck.
The sound is a simple synthesised tone made in your browser, not a recorded piano or guitar.