C♯ Major 7th Chord (C#maj7, Dbmaj7) on Piano
The C#maj7 chord (C# major 7th) is built from 4 notes: C# – E# – G# – B#. It is also written as Dbmaj7.
Play these notes on a MIDI keyboard, your computer keyboard, or the on-screen keys and ChordKeys will name the chord back to you.
Notes and intervals
| Note | Degree | Interval from C# | Semitones |
|---|---|---|---|
| C# | 1 | root | 0 |
| E# | 3 | major 3rd | 4 |
| G# | 5 | perfect 5th | 7 |
| B# | 7 | major 7th | 11 |
Inversions
Rearranging which note sits at the bottom gives you 4 playable voicings of the same chord. Inversions let you move between chords with less hand movement.
| Voicing | Notes | Bass note |
|---|---|---|
| Root position | C# – E# – G# – B# | C# in the bass |
| 1st inversion | E# – G# – B# – C# | E# in the bass |
| 2nd inversion | G# – B# – C# – E# | G# in the bass |
| 3rd inversion | B# – C# – E# – G# | B# in the bass |
How the major 7th chord is built
Every major 7th chord uses the same interval formula: 1 (0 semitones), 3 (4 semitones), 5 (7 semitones), 7 (11 semitones). Starting on C# and applying that formula produces C#, E#, G#, B#. Learn the formula once and you can build a major 7th chord on any of the twelve roots.
Keys that contain C#maj7
Every note of C#maj7 belongs to these keys, so it will sit naturally in a progression written in any of them.
Other chords on C#
Major 7th chords on other roots
Frequently asked questions
What notes are in a C#maj7 chord?
A C#maj7 chord contains the notes C#, E#, G#, B#. Those are the 1, 3, 5, 7 degrees measured from the root note C#.
How do you play C#maj7 on piano?
Place your thumb on C#, then add E# and G# and B# above it. With a right hand in root position the common fingering is 1–2–3–5.
Is C#maj7 the same as Dbmaj7?
Yes. C#maj7 and Dbmaj7 are enharmonic equivalents — they sound identical and use the same piano keys. Which spelling you use depends on the key you are playing in.