Learn › F9 Chord on Piano (F Dominant 9th)
New Released in April 2026
F9 Chord on Piano (F Dominant 9th)
The F dominant 9th chord (F9) uses the piano keys F, A, C, Eb and G: the dominant seventh F7 plus the 9th, G. Expect a sound that is rich and funky, a seventh chord with more colour.
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- MIDI keyboard
- Digital or acoustic piano
- Guitar
- Computer, phone or tablet
F9 and Am7b5
Above the root F sit four notes that form Am7b5: A C Eb G. A pianist can play F with the left hand and Am7b5 with the right, and the result is F9.
The formula of F9
Start from F7, which you may already know, and change one thing: add G above the seventh.
Start chord: F7
| Note | Step | Interval | Keys from F |
|---|---|---|---|
| F | 1 | root | 0 |
| A | 3 | major 3rd | 4 |
| C | 5 | perfect 5th | 7 |
| Eb | b7 | minor 7th | 10 |
| G | 9 | major 9th | 14 |
Ways to place F9 on the keys
Same notes, different order. Pick the position closest to the chord you just played.
Both hands: F Eb A C G
Rootless, 3rd on the bottom: A C Eb G
Rootless, 7th on the bottom: Eb G A C
Left hand alone: F Eb
Hands and fingers
| Left hand | F Eb | 5 1 |
|---|---|---|
| Right hand | A C G | 1 2 4 |
Make F9 automatic
- Find F, then add the other notes one at a time: F, A, C, Eb and G.
- Play F7, then F9, then F7 again, and hear what the 9th adds to the seventh.
- Try F9 in a rootless shape with the 3rd on the bottom, the position that sits closest to your last chord.
- Then test it in random order among other chords: recall under time pressure is what sticks.
Come back to F9 tomorrow: short daily sessions beat one long one.
Keys and moves for F9
- F9 is the V chord of Bb major: it pulls home to Bb.
- Many pianists play F9 whenever F7 appears, because the 9th makes the same pull sound richer.
Play F9 in a game
Chord symbols arrive one after another and the game checks every note you play, with MIDI or the microphone. Dominant 9ths appear in the later boss challenges, next to major and minor 9ths.
Play the demoCommon questions
How do you play F9 on the piano?
Press F, A, C, Eb and G together. Left hand plays F Eb (fingers 5 and 1), right hand A C G (1, 2, 4).
Is F9 the same as Am7b5?
Not quite: Am7b5 (A C Eb G) is only the upper part of F9. Add F underneath and you have the full F9.
Where is F9 used?
F9 is the V chord of Bb major: it pulls home to Bb. Many pianists play F9 whenever F7 appears, because the 9th makes the same pull sound richer.
Can I practise F9 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 F, A, C, Eb 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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