A3 French Horn Fingering
How to play A3 on the French horn: F side · thumb trigger off · valves 1 + 2 pressed.
Filled valves in the diagram are the ones you press — with your left hand: on the horn, the three valve levers and the thumb trigger are all worked by the left hand, while the right hand rests in the bell and looks after tuning and tone. The small lever marked T at the left of the diagram is the thumb trigger: filled means it is held down, which switches the horn to its B♭ side, and the pill under the valves names the side this fingering uses in words.
Hear A3 and try the fingering
Pick an instrument and a note and the diagram updates instantly — filled keys are the ones you press. The same finder sits on every note page, pre-set to that note.
The A3 fingering, step by step
- Leave the thumb trigger alone — this note is played on the F side of the double horn, the longer tubing, with the trigger untouched. The F side carries the standard fingerings up to G4.
- Press valve 1 with your left index finger — press it straight down, all the way, with the pad of the finger. The horn's valves are worked by the left hand; the right hand stays in the bell.
- Press valve 2 with your left middle finger — press it straight down, all the way, with the pad of the finger. The horn's valves are worked by the left hand; the right hand stays in the bell.
- Keep the fingers you are not using curved and resting lightly on their valve caps, ready for the next note.
In short: F side · thumb trigger off · valves 1 + 2 pressed.
Alternate fingering for A3
B♭ side · thumb trigger pressed · valves 1 + 2 pressed.
This version plays A3 on the B♭ side of the double horn, thumb trigger down. It is the version you need on a single B♭ horn, and some players reach for the B♭ side's security and brighter sound in this register even on a double horn — but the F side above is the school standard here, so learn it first.
About A3 on the French horn
The low register belongs to the F side: every standard fingering in it leaves the thumb trigger alone, and the notes come from the long tube’s widely spaced harmonics, which is why they feel roomy and secure under the lips. The register runs from the horn’s lowest standard note, F♯3, up to F4, and its valve ladder is the foundation every horn player builds first.
A3 is note 4 of the 31 in the full french horn fingering chart, sitting between A♭3 below it and B♭3 above it.
Like every fingering on this site, it was checked against the NoteAtlas French horn fingering chart and the First 5 Notes French horn fingering chart before publishing.
Practising A3
Practise the low register with slow, warm air and a relaxed embouchure — low horn notes speak late if you force them. Work down the valve ladder from open F4 a semitone at a time, and check the 1+3 and 1+2+3 notes against a tuner: those combinations lean sharp, and the correction comes from the lips and the right hand in the bell.
Questions about A3
What is the fingering for A3 on French horn?
F side · thumb trigger off · valves 1 + 2 pressed. A3 is a low register note on the French horn, played on the F side of the double horn. The full step-by-step is on this page, and you can hear the note with the Fingering Finder.
What does A3 sound like on a French horn?
Concert D3 — the French horn in F sounds a perfect fifth below its written notes, so written A3 sounds as concert D3. When your band director asks for a concert D3, this is the note you finger.
Is there an alternate fingering for A3?
Yes — B♭ side · thumb trigger pressed · valves 1 + 2 pressed. This version plays A3 on the B♭ side of the double horn, thumb trigger down. It is the version you need on a single B♭ horn, and some players reach for the B♭ side's security and brighter sound in this register even on a double horn — but the F side above is the school standard here, so learn it first.
Think this fingering is wrong? Report it — every report is checked against the source charts.