If you want to play Fm7b5 on the guitar, start with its notes: F, G#, B, D#. Its first guitar voicing is a barre chord at fret 1: low E string at fret 1 (index finger); A string at fret 2 (middle finger); D string at fret 1 (index finger); G string at fret 1 (index finger); B string open; high e string at fret 1 (index finger). This is a half-diminished 7th chord, and the sections below take you from the notes table to real fingerings, common mistakes and the musical contexts where Fm7b5 sounds right.
What notes are in the Fm7b5 chord?
The Fm7b5 chord is a half-diminished 7th chord, and its notes are fixed: F, G#, B, D#. Every voicing on every instrument uses these same notes, in some order and in some octave — change one of them and you are playing a different chord. The table below lists each note with its interval from the root F, so you can see the structure of Fm7b5 at a glance. On the guitar, start with the first voicing above and listen for the notes F, G#, B, D# in Fm7b5.
| Note | Interval |
|---|---|
| F | Root |
| G# | b3 |
| B | b5 |
| D# | b7 |
The root is F, the note the chord is named after and the note your ear hears as home. Above it, the intervals in Fm7b5 are b3, b5, b7. Learn those intervals rather than memorising the shape alone, because the same interval pattern transposed to another root gives you the same quality of chord anywhere. On the guitar, the notes appear in the order the fingering dictates, but the set of notes never changes.
Fm7b5 sounds tense but elegant, a diminished triad softened by a flattened 7th that keeps it from sounding harsh. That character comes straight from the intervals above, not from the instrument: the same notes on piano, guitar or ukulele carry the same colour, even though the voicing changes. On the guitar, start with the first voicing above and listen for the notes F, G#, B, D# in Fm7b5.
Comparing Fm7b5 with its closest relatives helps to fix it in your ear. In short, half-diminished against diminished 7th: Fm7b5 keeps the flattened 7th D#; the diminished 7th flattens it further to D. The half-diminished sounds softer and more usable. Play both chords slowly, one after the other, and notice which note moves. Naming that note out loud while you play is the fastest way to learn the difference. On the guitar, start with the first voicing above and listen for the notes F, G#, B, D# in Fm7b5.
How to play Fm7b5 on guitar
On the guitar, Fm7b5 has 3 voicings in the data below, and each one uses the same notes — F, G#, B, D# — in a different place on the neck. There are 3 voicings listed for Fm7b5 on the guitar; learn the first, then add the others as you need them. Finger numbers below use 1 for the index finger, 2 for the middle finger, 3 for the ring finger and 4 for the little finger, and x means the string is not played.
The barre chord is the voicing to learn if you want Fm7b5 in open position: low E string at fret 1 (index finger); A string at fret 2 (middle finger); D string at fret 1 (index finger); G string at fret 1 (index finger); B string open; high e string at fret 1 (index finger). It barres across strings 3 to 4 at fret 1 with the index finger. The barre is the hard part: the index finger must press every string from 3 to 4 evenly at fret 1, so roll it slightly onto its bony side and keep it close to the fret wire. If the barre buzzes, move it a fraction closer to the fret and press from the arm, not the thumb alone. Strum or pluck it slowly first and check that every note in Fm7b5 — F, G#, B, D# — sounds, with no buzz and no accidental open string.
The movable voicing puts Fm7b5 in around fret 2: low E string at fret 4 (ring finger); A string at fret 2 (index finger); D string at fret 3 (middle finger); G string at fret 4 (little finger); B string at fret 4 (little finger); high e string at fret 4 (little finger). This voicing is comfortable because the fretted notes sit close together, from fret 2 to fret 4, so your hand stays relaxed and every note can ring. Strum or pluck it slowly first and check that every note in Fm7b5 — F, G#, B, D# — sounds, with no buzz and no accidental open string.
Another way to play Fm7b5 is the barre chord, in open position: low E string at fret 1 (index finger); A string at fret 2 (middle finger); D string at fret 1 (index finger); G string at fret 1 (index finger); B string open; high e string at fret 4 (ring finger). It barres across strings 1 to 4 at fret 1 with the index finger. The barre is the hard part: the index finger must press every string from 1 to 4 evenly at fret 1, so roll it slightly onto its bony side and keep it close to the fret wire. If the barre buzzes, move it a fraction closer to the fret and press from the arm, not the thumb alone. Strum or pluck it slowly first and check that every note in Fm7b5 — F, G#, B, D# — sounds, with no buzz and no accidental open string.
Choosing between the voicings of Fm7b5 is a musical decision, not a right-or-wrong one. The open or low-position voicing rings the most and suits strumming, while a barre or movable voicing lets you slide Fm7b5 up the neck to any key without changing the shape. When you change chords, pick the voicing of Fm7b5 that sits closest to the chord before it — shorter moves between shapes mean faster, cleaner changes. Practise the change into Fm7b5 from the chord that comes before it in your song, not the chord on its own, because the move is the skill. On the guitar, the barre chord voicing is the place to hear it in Fm7b5.
A short practice routine for Fm7b5 on the guitar: play the first voicing four times slowly, checking each note, then change to it from the chord a fourth above F and back, four times, at a slow tempo. Then play the second voicing the same way. If a note buzzes, stop and fix the finger placement rather than playing through the buzz — clean notes at a slow tempo become clean notes at full tempo, while buzzes practised fast become habits. Use the Guitar Chord Finder to see the diagram for Fm7b5 while you practise, and the Chord Finder to compare it with the same chord on other instruments.
Common mistakes
These are the mistakes that most often make Fm7b5 sound wrong on the guitar, and each one has a concrete fix. Work through them one at a time rather than trying to fix everything at once.
Burying the flattened 5th. B is the note that defines this chord. If it is muted, the chord collapses into a minor 7th. On the guitar, the barre chord of Fm7b5 puts those notes under your fingers in the order the fingering lists them.
Barre collapsing on the high strings. In a barre voicing of Fm7b5, the high strings are the ones that buzz first, because the index finger presses hardest near the thumb. If the top notes of Fm7b5 sound dead, roll the barring finger slightly toward the fret and press from the arm, not from squeezing the neck. On the guitar, the barre chord of Fm7b5 puts those notes under your fingers in the order the fingering lists them.
Playing a perfect 5th. The 5th must be flattened to B. A perfect 5th turns this into a plain minor 7th chord. On the guitar, the barre chord of Fm7b5 puts those notes under your fingers in the order the fingering lists them.
Playing the diminished 7th. The 7th here is D#, not D. Flatten it once more and you have the fully diminished chord. On the guitar, the barre chord voicing is the place to hear it in Fm7b5.
Where Fm7b5 is used
Fm7b5 is not a diatonic triad in any major or minor key, because it is an extended or altered chord, but its base triad belongs to the key of C# major, the key of D# major, the key of G# major. a passing chord in jazz, leading to a dominant chord and then home. As a dominant-type chord it also points toward A# major, the key a perfect fourth above F, which is the tonic it most often resolves to. That is where Fm7b5 does its work: not as a home chord, but as a chord that creates movement and then resolves. On the guitar, start with the first voicing above and listen for the notes F, G#, B, D# in Fm7b5.
Because Fm7b5 is an extended or altered chord, it appears in progressions as a colour or a dominant rather than as a diatonic staple. Try it in place of the plain F triad in a progression you already know, and listen to how the extra notes change the feel — that substitution is the usual way extended chords enter real music. The Chord Progression Builder lets you try Fm7b5 in a progression in any key and hear how it connects to the chords around it. On the guitar, start with the first voicing above and listen for the notes F, G#, B, D# in Fm7b5.
The same chord on other instruments is covered in Fm7b5 on piano, Fm7b5 on ukulele, Fm7b5 on bass, and the scales that fit over it are the F major scale and the F minor pentatonic scale. Learning Fm7b5 on the guitar and then checking it on another instrument is one of the best ways to fix the notes — F, G#, B, D# — in your memory, because the notes stay the same while everything else changes.
Practising Fm7b5
A short worked example makes Fm7b5 concrete. Play the four-chord progression A# – F – Gm – D# in A# major, the key Fm7b5 most often resolves toward: A# – F – Gm – D#. Play each chord for one bar at a slow tempo, and listen to how Fm7b5 sounds in that sequence — whether it feels like home, like a lift, or like a chord on its way somewhere else. Then play the same four chords in a different order, starting on Fm7b5 itself, and notice how its character changes when it opens the progression instead of sitting inside it. On the guitar, start with the first voicing above and listen for the notes F, G#, B, D# in Fm7b5.
For a second exercise, play Fm7b5 and then the chord a fourth above F, back and forth, four times each. That move — a chord and the chord a fourth above it — is the most common resolution in Western music, and it is the move Fm7b5 is built for when it acts as a dominant. Finish by playing Fm7b5 on its own, slowly, and naming each note out loud as you play it: F, G#, B, D#. Naming the notes while you play them is what turns a shape into knowledge you can use in any key. Test yourself with the Practice Chord Quiz and keep time with the Metronome as the tempo rises. On the guitar, the barre chord of Fm7b5 puts those notes under your fingers in the order the fingering lists them.
Frequently asked questions
Is Fm7b5 hard to play on the guitar?
It depends on the voicing. The first voicing of Fm7b5 on the guitar is the easiest starting point, and the movable voicings further up the neck are harder because they need a barre or a wider stretch. Practise the first voicing cleanly at a slow tempo before you try the others, and the harder shapes will come more easily.
What is the easiest voicing of Fm7b5 on the guitar?
The barre chord is the easiest voicing listed for Fm7b5 on the guitar: frets 1–2–1–1–0–1, fingers 1–2–1–1–0–1. Learn that shape first, get every note ringing cleanly, and only then move on to the alternative voicings further up the neck.
What does m7b5 mean in Fm7b5?
It means a minor 7th chord with a flattened 5th: F, G#, B, D#. The triad is diminished (F, G#, B) and the 7th is flattened (D#), hence half-diminished. On the guitar, the first voicing above shows where that note sits.
Where is Fm7b5 used?
As the ii chord in minor keys, in the minor ii–V–i progression, and in jazz standards and bossa nova. It almost always leads to a dominant chord. On the guitar, the first voicing above shows where that note sits.
What is the difference between Fm7b5 and Fdim7?
Fm7b5 has the flattened 7th D#; Fdim7 has the double-flattened 7th D. Fm7b5 sounds softer and more usable; the diminished 7th sounds tenser and more dramatic. On the guitar, the first voicing above shows where that note sits.