B thirteenth (B13) chord on ukulele

The B thirteenth chord (B13) is a thirteenth chord (a dominant ninth plus a major thirteenth), made of six notes: B – D♯ – F♯ – A – C♯ – G♯.

Dots show:

Basic shapeeasy

Position 7easy

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What the B13 chord sounds like

A thirteenth chord is a dominant seventh with an added major thirteenth (the sixth an octave up). On an instrument the fifth and often the ninth are dropped, and the eleventh is left out. A classic jazz and blues dominant.

Notes of the B13 chord

Degree	Note	Interval from the root
1	B	root
3	D♯	major third (4 semitones)
5	F♯	perfect fifth (7 semitones) – often omitted on fretted instruments
7	A	minor seventh (10 semitones)
9	C♯	major second (2 semitones) – often omitted on fretted instruments
13	G♯	major sixth (9 semitones)

How to play it – with fingering

Basic shape

String 1 (A): open (A4)
String 2 (E): fret 4, ring finger (G♯4)
String 3 (C): fret 3, index finger (D♯4)
String 4 (G): fret 4, middle finger (B4)

Position 7

String 1 (A): open (A4)
String 2 (E): fret 7, index finger (B4)
String 3 (C): fret 8, ring finger (G♯4)
String 4 (G): fret 8, middle finger (D♯5)

Tuning: G C E A (the G string is higher than the C – standard re-entrant ukulele tuning). In the diagram, × means the string is not played, and a circle means an open string.

Which keys is it in?

The B13 chord is built from the notes of these keys (for minor keys, both the natural and the harmonic minor are considered):

E major: V13 (dominant)
C♯ minor: VII13

Similar chords and substitutes

If B13 is too hard, or you want a different colour in the same spot, these chords are worth a try.

Substitutes (by function)

F7 – tritone substitute: the same third and seventh, swapped – a jazz favourite
E♭dim7 – diminished seventh on the third: a common stand-in for the dominant
B7 – a simpler dominant
B7sus4 – suspended dominant, less tense
E – where it resolves (V → I)

Simpler versions

B9 – all 5 of its notes are in this chord
B7 – all 4 of its notes are in this chord
B6 – all 4 of its notes are in this chord
Badd9 – all 4 of its notes are in this chord

Frequently asked questions

What notes are in the B13 chord?

B, D♯, F♯, A, C♯, G♯. The root is B; the intervals of the other notes from the root: major third, perfect fifth, minor seventh, major second, major sixth.

What is the easiest way to play B13 on ukulele?

The easiest shape above is “Basic shape”, rated easy. We show 2 shapes, from open and easy versions to movable barre shapes higher up the neck.

How do I read the chord diagram?

Strings run from the lowest (left) to the highest (right) – tick “Left-handed” to mirror it. Rows are frets; a number at the side shows the starting fret. Dots are fingers (1 index, 2 middle, 3 ring, 4 little), a long bar is a barre, × means don't play that string and ○ means play it open.

Why is a note missing from some B13 shapes?

On a fretted instrument you can't always play every note of a 6-note chord. The fifth (F♯) and ninth (C♯) may be dropped – the chord keeps its character without them.

Why do some songbooks write H instead of B?

In German and Central European notation, H is the note B, and B is the note B♭. So a “B” chord in a German or Hungarian songbook is B♭ in English notation, and an “H” chord is B. Always check which notation your chord chart uses.