Learn › C#sus4 Chord on Piano (C Sharp Suspended 4th)
New Released in April 2026
C#sus4 Chord on Piano (C Sharp Suspended 4th)
C#sus4, the C sharp suspended 4th chord, is the major triad C# with its third E# lifted to the 4th, F#. Its notes on the piano are C#, F# and G#. Expect a sound that is tense and waiting, the 4th wants to fall to the third.
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- MIDI keyboard
- Digital or acoustic piano
- Guitar
- Computer, phone or tablet
The formula of C#sus4
Every chord is a recipe of scale steps. For C#sus4 the recipe is 1 4 5, counted from C#.
Start chord: C#
| Note | Step | Interval | Keys from C# |
|---|---|---|---|
| C# | 1 | root | 0 |
| F# | 4 | perfect 4th | 5 |
| G# | 5 | perfect 5th | 7 |
C#sus4 in every position
Learn them in pairs: root position first, then the one that keeps the most notes still.
Root position: C# F# G#
1st inversion: F# G# C#
2nd inversion: G# C# F#
Fingering
| Right hand | C# F# G# | 1 4 5 |
|---|---|---|
| Left hand | C# F# G# | 5 2 1 |
C#sus4 and F#sus2
The notes of C#sus4 also spell F#sus2: start from F# and you get root, 2nd and 5th of F#. Same keys, two names, and the lowest note picks the one you hear.
Where C#sus4 is used
- The classic move is C#sus4 → C#: the 4th F# falls one step to the third E# and the tension melts.
- You can use it in C# major, Ab major (as Db) and F# major, wherever C# itself fits.
A short C#sus4 routine
- Find C#, then add the other notes one at a time: C#, F# and G#.
- Play C#, then C#sus4, then C# again, and hear what the 4th pulls back toward the third.
- Try C#sus4 in 1st inversion, the position that sits closest to your last chord.
- Last, meet C#sus4 mixed with chords you already know, in an order you did not plan.
Five minutes a day is enough to make C#sus4 feel easy.
Train C#sus4 with ChordRunner
Chord symbols arrive one after another and the game checks every note you play, with MIDI or the microphone. Suspended chords have their own level, "Suspended (sus2/sus4)".
Play the demoCommon questions
How do you play C#sus4 on the piano?
Press C#, F# and G# together. Right hand 1 4 5, left hand 5 2 1.
What is the difference between C#sus4 and C#?
C# is C# E# G#. To get C#sus4, raise the third E# one half step to F#.
Where is C#sus4 used?
The classic move is C#sus4 → C#: the 4th F# falls one step to the third E# and the tension melts. You can use it in C# major, Ab major (as Db) and F# major, wherever C# itself fits.
Can I practise C#sus4 with a MIDI keyboard or a real piano?
Yes. In ChordRunner a USB MIDI keyboard is detected automatically, and an acoustic or digital piano works through the microphone. The game checks that C#, F# and G# sound together.
Your instrument is the controller.
ChordRunner is a browser game that teaches piano and guitar chords: a chord appears on screen, you play it on a real instrument, and your runner jumps. MIDI keyboard or microphone, both work.
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