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C dominant seventh chord

The C7 chord (dominant seventh) is made of the notes C, E, G, B♭. Its formula compared with the major scale is 1 3 5 ♭7.

C7

Sevenths · 4 notes

Note names

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How it is built

DegreeNoteInterval from the root
1CUnison
3EMajor third
5GPerfect fifth
♭7B♭Minor seventh

Inversions

  • C7C E G B♭Root position
  • C7/EE G B♭ CFirst inversion
  • C7/GG B♭ C ESecond inversion
  • C7/B♭B♭ C E GThird inversion

Which keys it belongs to

C7 is a diatonic chord, that is, it comes from a degree of the scale, in these keys:

Frequently asked questions

Which notes make up the C7 chord?
The notes are C, E, G, B♭.
What is the formula of the C7 chord?
The formula is 1 3 5 ♭7: major third, perfect fifth, minor seventh.

Texts and tools by , professional musician and developer. Last updated: October 8, 2026.

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