Bm7b5 Chord
2nd Fret · A-String RootThe standard jazz grip for a half-diminished chord, and the one to learn first. Index on the A string at fret 2 for B, ring on the D string at fret 3 for F, middle on the G string at fret 2 for A and pinky on the B string at fret 3 for D — four notes, one per string, no barre. It is the m7 grip on the A string with the 5th lowered a fret. Let the index tip touch the low E to mute it, and keep the high e out of the strum.
Bm7b5 Chord
7th Fret · E-String RootThe E-string partner to the A-string grip — the pair covers the whole neck between them. Middle finger on the low E at fret 7 for B, ring on the D string at fret 7 for A, pinky on the G string at fret 7 for D, and index on the B string one fret back at 6 for F. The underside of the middle finger mutes the A string and the fingers' pads keep the high e quiet. It is the classic comping shape for the ii chord of a minor ii–V–i.
Bm7b5 Chord
9th Fret · D-String RootFour strings, rooted on the D string — the voicing for when the bass player has the low end. Index on the D string at fret 9 for B, then middle, ring and pinky side by side on the G, B and high e strings at fret 10 for F, A and D. It is the open Dm7b5 shape moved up the neck, with the index standing in for the nut. Mute the low E and A.
Start from Bm7
Play Bm7 and lower the 5th by one fret, to F. Nothing else moves. That single half step is the whole difference, and it is why the chord is written m7♭5.
Half-diminished, not diminished
The bottom three notes — B, D, F — are Bdim. Add the minor 7th, A, and you have Bm7b5. Add a 7th one fret lower instead and you have Bdim7, a different chord. Charts that say "dim" sometimes mean either, so check the notes.
Hear it in a minor ii–V–i
Play Bm7b5 – E7 – Am. The half-diminished chord is the ii of A minor, and that three-chord move is the backbone of minor-key jazz standards and bossa nova. Its D is also the 7th of E7, which is why the two chords sit so naturally side by side.
Same notes as two other chords
Bm7b5 contains exactly the same four notes as Dm6 — the bass decides the name — and it is also the top four notes of G9, played without the root. Every shape on this page keeps B lowest, so let the root ring.
Slide the grip
The A-string, E-string and D-string shapes use no open strings once they leave the nut, so they slide. Move any one up a fret and you have Cm7b5; down a fret and you have A#m7b5.
About the Bm7b5 Chord on Guitar
The Bm7b5 chord — also written Bm7♭5, Bø7 or B half-diminished — is built from four notes: B (the root), D (the minor 3rd), F (the diminished 5th) and A (the minor 7th). The formula is 1 – ♭3 – ♭5 – ♭7: a Bm7 chord with the 5th lowered a half step. The bottom three notes form a diminished triad, which is where the name comes from — the triad is diminished but the 7th is not, so the chord is only half-diminished. That lowered 5th makes it restless rather than sad; the chord wants to move, and it almost always moves to a dominant 7th. Its home is the minor ii–V–i, Bm7b5 – E7 – Am, the progression at the heart of minor-key jazz, bossa nova and a good deal of pop and neo-soul. It is also the vii chord of C major. Two things it is not: Bdim7, which has a 7th one fret lower, and Bm7, which keeps the perfect 5th. And one thing it is, note for note: Dm6, the same four notes with a different bass. This page covers three voicings: the A-string root grip at fret 2, the E-string root grip at fret 7, and a four-string form rooted on the D string at fret 9. Every diagram is interactive and playable with acoustic guitar sound.
- 013 Bm7b5 chord shapes at intermediate level
- 02Interactive diagrams — click Play to hear each chord
- 03Acoustic guitar sound via audio engine
- 04Built from 4 notes: B, D, F and A (formula 1 – ♭3 – ♭5 – ♭7)
- 05A-string root, E-string root, and D-string root voicings
- 06Difficulty rating on every shape
- 07Free — no sign-up or download needed
ANATOMY
Chord Tones
The 4 notes that form the B Minor 7th Flat 5 chord and their role in the major scale.
Every half-diminished (m7♭5) chord follows this same formula — root, minor third, diminished fifth, minor seventh. A diminished triad with a minor 7th on top, not the diminished 7th of a dim7 chord.
Frequently Asked Questions
Play x-2-3-2-3-x — index on the A string at fret 2 for the root, ring on the D string at fret 3 (F, the ♭5), middle on the G string at fret 2 (A, the ♭7), and pinky on the B string at fret 3 (D, the ♭3). Mute the low E and the high e.
B, D, F and A — root, minor 3rd, diminished 5th and minor 7th.
Because only half of it is diminished. B–D–F is a diminished triad, but the 7th, A, is a minor 7th. A fully diminished 7th chord, Bdim7, lowers that 7th one more fret.
As the ii chord in a minor key — Bm7b5 – E7 – Am — or anywhere a minor 7th needs more pull toward the next chord. It almost always resolves to a dominant 7th a 4th above, here E7.