Interactive chord tool
Piano Chord Finder
Choose a root and chord type to identify the piano chord name, notes, and interval formula, then hear the result. Use the finder when you know part of a chord but need a fast reference.
Find a piano chord
Chord
Notes
C – E – G
Formula
1–3–5
Common chord formulas
| Chord | Notes from C | Formula |
|---|---|---|
| C | C E G | 1–3–5 |
| Cm | C Eb G | 1–♭3–5 |
| C7 | C E G Bb | 1–3–5–♭7 |
| Cmaj7 | C E G B | 1–3–5–7 |
| Cm7 | C Eb G Bb | 1–♭3–5–♭7 |
| Cdim | C Eb Gb | 1–♭3–♭5 |
| Csus4 | C F G | 1–4–5 |
How to identify an unknown chord
List the distinct notes, reduce doubled octaves, and test each note as a possible root. Look for thirds and sevenths first because they reveal quality and function. A bass note may be an inversion rather than the root, so compare the result with the surrounding chords.
Frequently asked questions
How does a piano chord finder work?
Select a root note and chord quality. The tool applies the quality’s interval formula to the root and returns the resulting pitch classes.
What is the difference between C7 and Cmaj7?
C7 contains B-flat, a minor seventh above C. Cmaj7 contains B natural, a major seventh above C. That one-semitone difference changes both sound and harmonic function.
Can the same notes have different chord names?
Yes. Inversions, enharmonic spelling, omitted roots, and musical context can make one pitch collection support more than one analysis.