Piano Chord Finder

Select the distinct notes you are playing on the one-octave keyboard. You choose note names rather than registers, so a C in any octave is the same selection here.

If you know which of those notes is lowest, choose it under Lowest note. Leaving it unset means the bass is unknown, so every root that fits the same notes stays in the candidate list.

C, E and G supports C major. The same three notes with E as the lowest note are described more precisely as C/E, a C major chord with E in the bass.

Read the candidate name, the bass and the supported vocabulary together. A chord’s root is not always its lowest note, and a name missing from the supported set does not mean your notes are musically wrong.

The notes C, E, G and A can be read as C6 or Am7. With C set as the lowest note, the A-minor-seventh reading appears as Am7/C.

With A as the lowest note, Am7 and C6/A are both candidates. Musical context can favour one reading, but the notes on their own do not settle it.

Playing C in two octaves adds spacing, not a new note name. The finder compares note names, so a doubled C does not change the candidate list.

Spacing still matters at the piano. Use Lowest note to say which note is at the bottom, because that is what separates C major from C/E.

C and G contain no third, so this selection cannot decide between C major and C minor. That is a limit of the notes you entered, not proof that two notes cannot sound useful together.

When a selection falls outside the supported vocabulary, your note list stays visible and the result reports that no supported match was found rather than offering the nearest guess.

The finder compares your notes with 433 supported objects. Repeated octaves are treated as the same pitch classes, so doubling a note does not create a new chord.

A complete formula match contains every chord tone. A reduced voicing is labeled separately when the notes match an explicit example that leaves some degrees out.

The supported registry includes triads, power fifths, sixths, seventh chords, add chords, extended chords and explicit altered structures. Each family is validated before it enters this shared matcher.

A chord candidate is not a song-key result. A written-note input is also not microphone recognition, MIDI capture or a measurement of timing and technique.