Chord Finder (Notes in a Chord)
Type any chord symbol (Cmaj7, F#m7b5, Bb/D, Ab13) to see its correctly spelled notes, intervals, inversions, piano keys and a guitar shape.
| Interval | Note | Semitones | Same key as |
|---|---|---|---|
| 1 | C | 0 | |
| 3 | E | 4 | |
| 5 | G | 7 | |
| 7 | B | 11 |
| Inversion | Notes from the bass up |
|---|---|
| Root position | C E G B |
| 1st inversion (3rd in the bass) | E G B C |
| 2nd inversion (5th in the bass) | G B C E |
| 3rd inversion (7th in the bass) | B C E G |
Type a chord symbol and see exactly which notes it contains, spelled the way music theory requires (B♭, not A♯, in a B♭ chord), with its intervals, semitone formula, every inversion, the keys to press on a piano and a playable guitar shape. It understands major, minor, sevenths, sixths, suspended, diminished, augmented, extended chords up to 13ths, added notes, altered tones such as ♭5, ♯9 or ♯11, and slash chords.
How to use this tool
- Type the chord: the root (A–G, with # or b), then the type, for example m7, maj9, sus4, dim7, 7#9 or add9.
- For a slash chord, add / and the bass note, as in C/E or Bb/D.
- Read the notes, intervals and inversion in the results.
- Use the tables for every chord tone and all inversions, and the guitar shape to play it.
Formula
Note = root + interval · the letter moves by the scale step (3rd = +2 letters, 5th = +4, 7th = +6, 9th = +1), the accidental makes up the semitones
Intervals in semitones above the root: 3 = 4 (b3 = 3), 5 = 7 (b5 = 6, #5 = 8), 6 = 9, 7 = 11 (b7 = 10, bb7 = 9), 9 = 14, 11 = 17, 13 = 21. Dominant chords (7, 9, 11, 13) have the b7; maj7 chords the 7. Extended chords list the full stack of thirds; when played, the 5th and 9th are often left out, the 11th is omitted against a major 3rd, and in an 11th chord the 3rd. An inversion puts the 3rd (1st inversion), 5th (2nd) or 7th (3rd) in the bass.
Example
F#m7b5 is root F#, minor 3rd (3 semitones) = A, diminished 5th (6) = C, minor 7th (10) = E: F# A C E, with the formula 1 b3 b5 b7. Bb/D has the 3rd, D, in the bass, so it is the first inversion of B♭ major (D F B♭ from the bottom).
Frequently asked questions
Why does it write Bb and not A#?
In a B♭ chord the 3rd must be a kind of D and the 5th a kind of F, so the root is spelled with the letter B. A♯ and B♭ are the same piano key, but chord spelling follows the letters of the scale steps.
What is the difference between m7b5 and dim7?
Both have a minor 3rd and a diminished 5th. m7b5 (half-diminished, ø) adds a minor 7th (10 semitones); dim7 adds a diminished 7th (9 semitones), which sounds the same as a 6th but is spelled as a 7th, such as Bbb in Cdim7.
Which chord symbols are understood?
Major (C, Cmaj, CM), minor (Cm, Cmin, C-), 5, 6, m6, 6/9, 7, maj7, m7, mMaj7, dim, dim7, °, ø, m7b5, aug, +, sus2, sus4, 7sus4, 9, maj9, m9, 11, 13, add2, add9, add11, alterations b5, #5, b9, #9, #11, b13, no3/no5, and any slash bass.
Last updated:
Page address with these inputs: https://kakao.mobile/tools/chord-finder/
Cite or embed this tool
kakaoCalc. (2026, November 8). Chord Finder (Notes in a Chord). https://kakao.mobile/tools/chord-finder/
“Chord Finder (Notes in a Chord).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/chord-finder/.
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