Sus2 and sus4 chords both replace the 3rd of a triad, but with different notes: sus2 uses the major 2nd, two semitones above the root, while sus4 uses the perfect 4th, five semitones above the root. Csus2 is C, D and G; Csus4 is C, F and G, and the sus4 sounds more tense.
What is the difference between sus2 and sus4 chords?
Sus2 and sus4 chords are twins: both are triads with the 3rd removed, and both keep the same root and perfect 5th. The difference is the replacement note. A sus2 chord puts the major 2nd, two semitones above the root, in the 3rd's place. A sus4 chord puts the perfect 4th, five semitones above the root, there instead. Csus2 is C, D and G; Csus4 is C, F and G. The two chords share two notes out of three, yet they feel quite different, and knowing when to use each one is a small skill that makes a big difference to how your playing sounds. The feeling differs because of where the replacement note sits relative to the missing 3rd. In a sus4 chord the 4th is one semitone above the 3rd, close enough to create a real pull toward resolution: the ear hears the 4th as a note that is almost the 3rd but not quite, and it wants the gap closed. In a sus2 chord the 2nd sits a whole tone below the 3rd and a whole tone above the root, so it feels balanced and open rather than tense. The sus4 leans forward; the sus2 floats.
How the two chords compare
Build both from the same major triad and the comparison is obvious. G major is G, B and D. Gsus2 replaces B with A, the major 2nd above G, giving G, A and D. Gsus4 replaces B with C, the perfect 4th above G, giving G, C and D. In Gsus4 the C is one semitone above the missing B, so the resolution C to B is a tiny step down. In Gsus2 the A is two semitones below the missing B, so the resolution A to B is a whole step up, and the A can also fall to G, the root, which is why sus2 chords feel less directional. The interval inside each chord matters too. In Csus4 the notes F and G sit a whole tone apart, with the 4th and 5th close together at the top of the chord, which adds a mild friction. In Csus2 the notes C and D sit a whole tone apart at the bottom, with the root and 2nd close together, which gives a softer, more ringing quality. On guitar the Gsus4 guitar chord and the Gsus2 guitar chord show how similar the shapes are: one finger moves, and the chord changes character. The D major guitar chord is the base for the same pair in D.
Worked example — A sus2 vs A sus4. A major is A, C# and E. Asus2 replaces C# with B, the major 2nd above A, giving A, B and E. Asus4 replaces C# with D, the perfect 4th above A, giving A, D and E. Play Asus4 to A and the D falls one semitone to C#; play Asus2 to A and the B rises two semitones to C#. The sus4 resolution is quicker and more decisive, while the sus2 resolution is gentler. Try both on the A major guitar chord shape, or build them with the chord finder from any root.
How to practise sus2 and sus4 chords
The goal is to hear the difference before you play it, so practise the two chords in direct comparison on the same root.
- Play Asus2 then Asus4 then A, listening for the open float of the sus2 and the leaning tension of the sus4.
- On guitar, play the Dsus2 guitar chord and the Dsus4 guitar chord back to back, keeping the D and A strings ringing in both.
- Use a sus4 chord before the V chord in the I–V–vi–IV progression in G major and a sus2 chord before the I chord, and compare the effect.
- On piano, play C, D and G together for Csus2, then C, F and G for Csus4, then resolve both to C, E and G.
- Write out the sus2 and sus4 chords for the key of D major and check your spellings against the interval calculator.
Common mistakes
- Using sus4 where you want an open sound — If a passage should feel calm and spacious, a sus4 chord adds tension you did not ask for. Use sus2 for openness and save sus4 for moments that need a push toward resolution.
- Resolving sus2 the wrong way — A sus2 chord can resolve up to the 3rd or down to the root, but resolving it down to the 3rd by mistake is impossible: the 2nd is below the 3rd, so it must rise. Play the movement slowly and check the direction.
- Forgetting that neither chord is major or minor — A sus chord can follow a major or a minor chord because it contains no 3rd. Beginners sometimes worry that a sus chord clashes with the key, but it cannot, since the note that would clash is the one that has been removed.
Quick reference
This table compares sus2 and sus4 chords on four more roots, including two sharp keys, so you can check the pattern away from the easy open-position keys. In every row the root and the 5th are identical in both columns, the sus2 column holds the major 2nd and the sus4 column holds the perfect 4th, and the only thing that changes between the columns is that one middle note.
| Root | Sus2 chord | Sus4 chord |
|---|---|---|
| E | E – F# – B | E – A – B |
| B | B – C# – F# | B – E – F# |
| F# | F# – G# – C# | F# – B – C# |
| F | F – G – C | F – A# – C |
Work through the rows on your instrument and pay attention to the sharp keys, where the suspended note is easy to spell wrong: the sus4 of F# is B, not A#, and the sus2 of B is C#, not Db. When the spellings feel automatic, use the table to choose between sus2 and sus4 deliberately, rather than by habit.
Frequently asked questions
Which is more common, sus2 or sus4?
Sus4 is more common, because its strong pull toward resolution makes it useful at the ends of phrases. Sus2 is common too, especially in folk, pop and ambient music, where its open sound is the point rather than a step toward something else.
Can a chord be both sus2 and sus4?
Not as a triad, because a triad has only three notes. A four-note chord can contain both the 2nd and the 4th, and it is usually written as an add9sus4 or a similar extended symbol, but that is a different chord from a plain sus2 or sus4.
Does a sus4 chord always resolve to major?
No. A sus4 chord can resolve to a minor chord as well, because the resolution is about the 4th falling to the 3rd, and that 3rd can be major or minor. Csus4 can resolve to C major or to C minor, depending on the context.
Why does sus4 sound more tense than sus2?
Because the 4th sits only one semitone above the 3rd it replaced, while the 2nd sits a whole tone below it. The closer the suspended note is to its resolution, the stronger the pull, and the semitone pull of the sus4 is the strongest there is.
Can I play sus2 and sus4 in the same song?
Yes, and many songs do. A common trick is to use sus2 chords in the verse for openness and sus4 chords before the chorus for lift, so the two colours mark different sections of the song.