A# or B♭ Sus4
1st Fret · A-Shape BarreMoveable A-shape sus4 rooted on A# at fret 1 — index barres fret 1 from the A string up, ring and pinky add F and A# at fret 3, pinky reaches D# on the B string at fret 4. Mute the low E. Fully moveable to any root.
A# or B♭ Sus4
6th Fret · E-Shape BarreMoveable E-shape sus4 rooted on A# at fret 6 — index barres all six strings at fret 6, ring and pinky add the 4th on the D and G strings at fret 8. Root A# is on the low E string.
A# or B♭ Sus4
Top-Four-String VoicingA compact voicing on the top four strings — F on the D string at fret 3, A# on the G string at fret 3, D# on the B string at fret 4, F on the high e at fret 1. Strum only the top four strings.
Spell it as B♭sus4 in flat keys
In written music this chord almost always appears as B♭sus4. The shapes and sound are identical — only the name changes with the key.
No open strings
A#sus4 has no open-string voicing in standard tuning, so every shape is fretted. The A-shape barre at fret 1 is the most dependable starting point.
Use it as a moveable shape
The x-1-3-3-4-1 barre is fully moveable — slide it up a fret for Bsus4 or up two for Csus4.
Resolve to the major chord
A#sus4 wants to fall back to A# (B♭) major. Practising B♭ → B♭sus4 → B♭ trains your ear to hear the suspension release.
Try the partial shape
When a full barre is awkward, the x-x-3-3-4-1 top-four voicing gives you the same chord with less stretch.
About the A#sus4 Chord on Guitar
The A#sus4 chord is built from three notes: A# (the root), D# (the perfect 4th), and F (the perfect 5th). It is an A# major triad with the 3rd suspended — the C-double-sharp is replaced by the D# a half step above it — so it sounds tense and unresolved rather than clearly major. Because none of its notes line up with open guitar strings, every A#sus4 voicing is fretted, which makes it good practice for moveable shapes. A#sus4 is enharmonically identical to B♭sus4 — same pitch, same shapes, different spelling depending on the key, and in practice it is almost always written B♭sus4. This page covers three voicings: a moveable A-shape barre, an E-shape barre, and a top-four-string form. Every diagram is interactive and playable with acoustic guitar sound.
- 013 A#sus4 or B♭sus4 chord shapes from intermediate to advanced
- 02Interactive diagrams — click Play to hear each chord
- 03Acoustic guitar sound via audio engine
- 04Moveable A-shape barre, E-shape barre, and a top-four-string voicing
- 05Difficulty rating on every shape
- 06Free — no sign-up or download needed
ANATOMY
Chord Tones
The 3 notes that form the A# or B♭ Sus4 chord and their role in the major scale.
Every major chord follows this same formula — root, major third, perfect fifth.