See any chord’s keys, notes and formula on a piano and a staff, in every inversion, or press keys to name the chord. 33 chord types, free.
Every chord is spelled the way it is written: C7 has a B♭, never an A♯, and a chord that needs a double sharp gets one. The keys are the chord stacked up from its root around middle C. An inversion moves its lowest notes up an octave and shows the slash symbol it is written with. Pressed keys get every name they spell, because the same four notes can be a sixth chord and a minor seventh at once. There are 33 chord types, the ones this site’s lead sheets and chord exercises use.
How it works
- Find a chord: choose a root and a chord type. Its keys light up, its notes are written on a grand staff, and the formula says what each note is in the chord (1, ♭3, 5, ♭7).
- Choose an inversion of a triad or a seventh chord to see which note goes to the bottom, and how the chord is written then (C/E for C major in first inversion).
- Press Play to hear it, together or one note at a time.
- Name the keys: press three or more keys, or play them on a digital piano, and every chord name they spell appears, the most usual first.
About the chord finder
Which chords does it know?
There are 33 chord types on all twelve roots: major, minor, diminished, augmented and suspended triads; seventh chords; sixths and added ninths; ninths, elevenths and thirteenths; and the altered dominants used in jazz.
Why do some keys get two names?
Some sets of notes are two chords at once. C, E, G and A are a C sixth and also an A minor seventh with C in the bass. Which name fits depends on the music around it, so the finder shows both, with the name the online piano gives listed first.
What is an inversion?
A chord with a note other than its root at the bottom. A triad has two inversions and a seventh chord has three. The finder shows each one and the slash symbol it is written with, such as C/E.
Can I name a chord by playing it on my piano?
Yes. Choose “Name the keys”, connect a digital piano over USB and press “Connect a piano”, then play the chord. Web MIDI works in Chrome and Edge, so on other browsers the button is not there.