Chord Finder
Build any piano chord to see its notes and name, or select notes on the keyboard and let the finder name the chord for you. Hear it played back — right in your browser.
Click keys to select notes
Chord formulas
| Chord | Semitones | Example in C |
|---|---|---|
| Major | 0–4–7 | C – E – G |
| Minor (m) | 0–3–7 | C – D♯ – G |
| Diminished (dim) | 0–3–6 | C – D♯ – F♯ |
| Augmented (aug) | 0–4–8 | C – E – G♯ |
| Sus2 (sus2) | 0–2–7 | C – D – G |
| Sus4 (sus4) | 0–5–7 | C – F – G |
| Major 6 (6) | 0–4–7–9 | C – E – G – A |
| Minor 6 (m6) | 0–3–7–9 | C – D♯ – G – A |
| Dominant 7 (7) | 0–4–7–10 | C – E – G – A♯ |
| Major 7 (maj7) | 0–4–7–11 | C – E – G – B |
| Minor 7 (m7) | 0–3–7–10 | C – D♯ – G – A♯ |
| Minor 7 flat 5 (m7♭5) | 0–3–6–10 | C – D♯ – F♯ – A♯ |
| Diminished 7 (dim7) | 0–3–6–9 | C – D♯ – F♯ – A |
| Add9 (add9) | 0–4–7–14 | C – E – G – D |
| Dominant 9 (9) | 0–4–7–10–14 | C – E – G – A♯ – D |
| Major 9 (maj9) | 0–4–7–11–14 | C – E – G – B – D |
| Minor 9 (m9) | 0–3–7–10–14 | C – D♯ – G – A♯ – D |
How the Chord Finder works
A chord is a group of notes played together, built from a root and a quality such as major, minor or seventh. This chord finder works both ways. In Build a chord, pick a root and a quality to see the exact notes — for example C major is C E G — with the shape highlighted on the piano; press Play chord to hear the notes together or Arpeggio to hear them one at a time. In Name a chord, click notes on the keyboard and the finder compares your selection against its formulas to name the chord. Everything runs on your device with the Web Audio API, so nothing is uploaded. Play the voicings on the Online Piano, keep time with the Metronome, or tune up with the Guitar Tuner.
Frequently Asked Questions
How do I find the notes in a chord?
Stay in the Build a chord mode, pick a root note such as C, and choose a chord quality such as Major or Minor 7. The tool instantly shows the note names — for example C, E and G for C major — writes out the full chord name, and highlights the notes on the piano. Press Play chord to hear all the notes together, or Arpeggio to hear them one after another.
How do I identify a chord from notes I already have?
Switch to the Name a chord mode and click the notes on the keyboard so they light up. As soon as three or more notes are selected the finder compares them against its chord formulas and shows the best matching name, such as A minor or G7. If nothing matches it tells you, so you can add or remove a note. Use Clear to start over.
What is the difference between major and minor chords?
A major chord uses the root, a major third (four semitones up) and a perfect fifth (seven semitones up) and sounds bright and happy. A minor chord lowers the third by one semitone to a minor third (three semitones up), which gives it a darker, sadder colour. Everything else stays the same, so C major is C E G and C minor is C E-flat G.
Is the chord finder free and does it work offline?
Yes — the chord finder is completely free with no sign-up and nothing to install. It runs entirely in your browser and the sound is generated on your device with the Web Audio API, so after the page loads it works offline and nothing you do is uploaded. There is no sign-up, no trial and nothing to install. Every chord is worked out and played in your browser with the Web Audio API rather than fetched from a server, so once the page has loaded you can keep building and naming chords with no network connection at all.
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