Suspended chords replace a triad’s third with either the second or fourth scale degree. The sus2 chord formula is 1–2–5, while the sus4 chord formula is 1–4–5. For example, Csus2 contains C–D–G, and Csus4 contains C–F–G.
Because neither formula includes a third, a suspended chord is not inherently major or minor. It has an open, unresolved character that works as a temporary embellishment or as a stable harmony in its own right. Understanding how the third determines chord quality makes the contrast clearer; see the major chord interval structure for the standard 1–3–5 comparison.
What Are the Sus Chord Formulas?
The two basic suspended chord formulas are:
| Chord type | Formula | C-root example | Notes |
|---|---|---|---|
| Sus2 | 1–2–5 | Csus2 | C–D–G |
| Sus4 | 1–4–5 | Csus4 | C–F–G |
In both formulas, the root establishes the chord’s tonal center and the perfect fifth supports it. The second or fourth occupies the position normally filled by a major or minor third. A plain chord symbol such as “Csus” usually means Csus4, not Csus2.
The word suspended comes from classical counterpoint, where a note was held over from a previous harmony before resolving by step. Modern chord symbols use “sus” more broadly: the chord only needs to omit the third and include the indicated second or fourth. If interval numbers and chord spellings are unfamiliar, this guide to how chords are constructed explains the root-based numbering system.
How Do You Build a Suspended Chord?
Build a suspended chord by starting with the root and perfect fifth, then adding either the second for sus2 or the fourth for sus4. If you begin with a major or minor triad, remove its third before adding the suspended note.
Start with the root and fifth
For a C-root chord, the root is C and the perfect fifth is G. These two notes create the structural frame C–G. The perfect fifth interval spans seven semitones, so the same method works from any root.
Replace the third
A C major triad is C–E–G, while C minor is C–E♭–G. Remove E or E♭, then:
- Add D, the second degree of the C major scale, to make C–D–G or Csus2.
- Add F, the fourth degree, to make C–F–G or Csus4.
The word replace matters. If the chord keeps E and adds D, the result is Cadd2 or, depending on voicing and notation context, Cadd9—not Csus2. The added-ninth formula shows why an added-note chord retains its third.
What Notes Are in Sus2 and Sus4 Chords in Every Key?
Every sus2 chord follows 1–2–5, and every sus4 chord follows 1–4–5. The following table uses spellings that preserve each note’s scale-degree function rather than replacing every flat or sharp with the easiest enharmonic name.
| Root | Sus2 notes | Sus4 notes |
| C | C–D–G | C–F–G |
| D♭ | D♭–E♭–A♭ | D♭–G♭–A♭ |
| D | D–E–A | D–G–A |
| E♭ | E♭–F–B♭ | E♭–A♭–B♭ |
| E | E–F♯–B | E–A–B |
| F | F–G–C | F–B♭–C |
| F♯ | F♯–G♯–C♯ | F♯–B–C♯ |
| G | G–A–D | G–C–D |
| A♭ | A♭–B♭–E♭ | A♭–D♭–E♭ |
| A | A–B–E | A–D–E |
| B♭ | B♭–C–F | B♭–E♭–F |
| B | B–C♯–F♯ | B–E–F♯ |
Enharmonic roots produce the same sounding pitches but require different written names. C♯sus4, for example, is C♯–F♯–G♯, while D♭sus4 is D♭–G♭–A♭. Correct spelling makes the 1–4–5 structure visible.
How Do Sus2, Sus4, Major, Minor, Add2, and Add4 Chords Differ?
Sus chords remove the third; major, minor, and added-note chords contain it. That single distinction determines whether the harmony has clear major or minor quality.
| Chord | Formula | C-root notes | What happens to the third? |
| C major | 1–3–5 | C–E–G | Major third retained |
| C minor | 1–♭3–5 | C–E♭–G | Minor third retained |
| Csus2 | 1–2–5 | C–D–G | Third replaced by second |
| Csus4 | 1–4–5 | C–F–G | Third replaced by fourth |
| Cadd2 | 1–2–3–5 | C–D–E–G | Third retained |
| Cadd4 | 1–3–4–5 | C–E–F–G | Third retained |
| C7sus4 | 1–4–5–♭7 | C–F–G–B♭ | Third replaced; seventh added |
| C11 | 1–3–5–♭7–9–11 | C–E–G–B♭–D–F | Third theoretically retained |
The distinction between Csus4 and C11 is especially important. A complete dominant eleventh chord implies a seventh and ninth, although practical voicings may omit some tones. The 11th chord construction guide covers those implied extensions and common omissions.
Csus2 and Gsus4 contain the same pitch collection: C–D–G. They are not automatically the same chord, because the perceived root changes their interval formulas. A bass note, melodic emphasis, metric placement, and surrounding progression can make C sound like 1 in Csus2 or G sound like 1 in Gsus4.
Do Suspended Chords Have to Resolve?
Suspended chords do not always have to resolve in modern music. A sus4 commonly moves to a major or minor triad when the fourth descends to the third, but pop, rock, folk, and modal harmony often treats sus2 and sus4 as self-contained chord colors.
Traditional resolution
In Csus4–C, the note F moves down one semitone to E while C and G remain fixed:
Csus4: C–F–G
C major: C–E–G
The small movement creates smooth voice leading and a clear release of tension. Csus4 can also resolve to C minor by moving F down to E♭. The destination chord, not the suspended chord itself, establishes major or minor quality.
Unresolved modern use
A progression can move between suspended chords without resolving each one. For example, Dsus2–Asus4–G creates open sonorities through shared notes and stepwise movement. In this setting, “suspended” describes the chord structure rather than a required preparation-and-resolution process.
How Are Sus Chords Used on Guitar and Piano?
On guitar and piano, sus chords are useful for melodic movement inside a stable harmony. Players can often change one note of a familiar major or minor shape while keeping the root and fifth in place.
Guitar application
Guitarists commonly alternate D, Dsus2, and Dsus4 because one fretting finger can move or lift while other chord tones ring. Open strings may double the root, fifth, or suspended note; doubling does not change the 1–2–5 or 1–4–5 identity. The same principle applies to movable shapes covered in guitar chord construction.
Always identify the sounding notes rather than judging a chord by its shape alone. A fingering may omit the fifth, double the root, or place the suspended note in the bass, yet the third must remain absent for an unambiguous sus label.
Piano application
On piano, play C–G in the left hand and add D or F in the right hand to hear the contrast between Csus2 and Csus4. Wider spacing can reduce muddiness in lower registers, while keeping the moving note near E makes a sus-to-major resolution easy to hear.
Inversions change note order without changing the chord’s pitch collection, provided the harmonic root remains clear. For a broader look at root position and reordered chord tones, see guitar chord inversions; the same root-versus-bass distinction applies across instruments.
Frequently Asked Questions
Does “sus” mean sus2 or sus4?
A chord symbol containing only “sus” normally means sus4. “Csus” is therefore generally interpreted as C–F–G, while Csus2 must specify the 2.
Is a suspended chord major or minor?
A basic sus2 or sus4 chord is neither major nor minor because it has no third. The surrounding harmony may suggest a major or minor destination, but the suspended chord itself remains ambiguous.
What is the difference between sus2 and add2?
Sus2 uses 1–2–5 and removes the third. Add2 uses 1–2–3–5 and keeps the third, so Cadd2 contains E while Csus2 does not.
Does a sus4 chord always resolve to a major chord?
No. A sus4 can resolve to major, resolve to minor, move to another chord, or remain unresolved. Modern chord-symbol usage does not require the classical preparation and resolution pattern.
Are Csus2 and Gsus4 the same chord?
Csus2 and Gsus4 use the same notes, C–D–G, but they describe different roots and interval functions. Context determines whether listeners hear C as the root of 1–2–5 or G as the root of 1–4–5.
What is the difference between sus4 and 7sus4?
Sus4 contains 1–4–5, while 7sus4 adds a minor seventh for 1–4–5–♭7. Csus4 is C–F–G; C7sus4 is C–F–G–B♭.
Liam Turner is a guitar theory writer and chord analysis specialist at Chord Calculator. He focuses on chord construction, music theory, scale relationships, harmony tools, and guitar learning resources for musicians, producers, songwriters, and beginners. Liam creates practical, easy-to-follow content around chord progressions, interval formulas, key analysis, and interactive music tools to help users better understand harmony, songwriting, and instrument practice.