The B 13 Chord Explained
B thirteen is a Dominant chord family sonority built from the notes B, D♯, F♯, A, C♯, E, and G♯. Its root is B, and its interval number formula is 1–3–5–♭7–9–11–13, which gives you the interval names root, major third, perfect fifth, minor seventh, major ninth, perfect eleventh, and major thirteenth. You may also see it written as B13, B dominant 13, or B dominant thirteenth. If you look at the widget above, you can match these chord tones on the piano and guitar diagrams and hear how the stacked intervals create this rich sound; if you are new to intervals, this guide to chord intervals can help.
B 13 Alternate Names
- B13
- B dominant 13
- B dominant thirteenth
B 13 Chord Notes
B 13 Chord Formula
B 13 Chord Notation
How To Use B 13 In Music
Because it is a dominant chord with added color tones, B13 sounds bright, jazzy, bluesy, and slightly tense, as if it wants to move somewhere else. It often creates forward motion and works especially well before a chord built a fourth above the root, so B13 commonly resolves to E or Em. In a progression, you might see V–I in E major as B13–E, or ii–V–I as F♯m7–B13–Emaj7. In A major, it can also appear as II–V with B13 leading to E7. The mood can feel smoother or sharper depending on the chords around it: surrounded by soft major chords it sounds colorful, but next to darker chords it can feel more urgent. To learn why this pull feels so strong, see what is a dominant chord.
B 13 Chord Inversions
Another useful idea is inversion, which means playing the same chord with a note other than B in the bass. For B13, examples include first inversion with D♯ in the bass, second inversion with F♯ in the bass, third inversion with A in the bass, and higher-note bass choices such as C♯, E, or G♯ when players want a lighter texture. Inversions do not change the chord’s basic identity, but they do change its weight, balance, and smoothness. A B13 with B in the bass feels grounded and strong, while a version with A or D♯ in the bass can sound more flowing or less final. Musicians use inversions to make bass lines smoother, connect chords with less jumping, and shape the mood of a progression in a more elegant way.
