The A 7♭5 Chord Explained
A seven flat five is a Half-Diminished family chord built from the notes A, C♯, E♭, and G. Its root is A, and its interval number formula is 1–3–♭5–♭7. That means the chord contains a root, major third, diminished fifth, and minor seventh. You may also see it written as A7♭5, A dominant flat five, or A7-5. If you look at the widget above, you can use the piano and guitar diagrams to spot these notes visually, and the sound samples can help you hear how the altered fifth changes the chord’s color. If you want to learn more about how these distances are counted, see chord intervals.
A 7♭5 Alternate Names
- A7♭5
- A dominant flat five
- A7-5
A 7♭5 Chord Notes
A 7♭5 Chord Formula
A 7♭5 Chord Notation
How To Use A 7♭5 In Music
Because of its lowered fifth, this chord sounds tense, unstable, and slightly mysterious, with more bite than a regular dominant seventh. It often appears when a song wants extra pull toward the next chord, especially in jazz, blues, and dramatic pop harmony. For example, A7♭5 can lead strongly to D minor in a progression like V–i in D minor, or it can appear in a chain such as iii–vi–II–V, where A7♭5 acts as the altered dominant before D. The mood can feel darker or sharper depending on the surrounding harmony: after a soft minor chord it may sound more haunting, while before a stable resolution it feels full of expectation. To compare that pull with a more standard version, you can read about dominant chords.
A 7♭5 Chord Inversions
Inversions happen when a note other than the root is placed at the bottom of the chord. For A7♭5, root position is A–C♯–E♭–G, first inversion is C♯–E♭–G–A, second inversion is E♭–G–A–C♯, and third inversion is G–A–C♯–E♭. These inversions keep the same chord identity but can change how smooth, heavy, or unsettled the chord feels. A bass note of C♯ can make it sound a little lighter, while G in the bass can increase the sense of tension and push toward resolution. Players use inversions to create smoother bass lines, connect chords with less movement, and shape the mood of a progression more carefully.
