Music & audio
Chord note calculator
Find the notes and frequencies of common root-position chords.
A clear answer. Here’s how.
Builds root-position chords from fixed semitone and diatonic letter patterns. Uses twelve-tone equal-tempered frequencies with your A4 reference, preserving chord-tone spellings including double accidentals when needed. No voicing, inversion or instrument fingering is inferred; outputs remain in MIDI range 0–127.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Root note with octave
- C4
- Chord type
- Major
- A4 reference frequency (Hz)
- 440
Example result
| Position | Spelled note | MIDI number | Frequency (Hz) |
|---|---|---|---|
| 1 | C4 | 60 | 261.625565301 |
| 2 | E4 | 64 | 329.627556913 |
| 3 | G4 | 67 | 391.995435982 |