Chord finder
Select the notes you’re playing on the piano, or set each string on the guitar, and see the chord’s name instantly.
Notes: none selected
Naming chords yourself
Put the notes in order of thirds (every other letter). If they stack cleanly, like A–C–E, the bottom of the stack is the root. Then measure the first gap: 4 semitones means major, 3 means minor. A fourth note 10 semitones above the root adds a 7; 11 makes it maj7.
The chord finder does this for every possible root at once. For the reverse, from a chord name to its notes, see piano chords or guitar chords.
Questions
How does the chord finder work?
It takes the notes you select and tests every root against 17 chord types, allowing the 5th to be missing (guitarists often drop it). The best match is ranked by how completely the notes fit and whether the lowest note is the root.
What is a slash chord?
A chord with a note other than the root in the bass, written Chord/Bass. C/E is a C major chord with E as the lowest note, a first inversion.
Why does it show more than one name?
Some note sets genuinely have several names. A–C–E–G is A minor 7 and also C6; which one is “right” depends on the bass note and the key of the song.