French Horn Tuner
Tune your French horn online with your microphone. The tuner shows the written note for horn in F: a written C sounds a concert F, a perfect fifth lower. Common tuning notes are concert F and concert B♭.
Press Start and allow the microphone
Your browser will ask to use the microphone. Choose Allow.
✓ All strings in tune
Tap a string to hear it and tune only that string. Audio is analysed on this device and never uploaded. How it works →
- What it does
- Shows the note you play as written for your instrument, its Hz and cents
- What it does not do
- Record or upload audio · detect chords
- Reference pitch
- A4 = 440 Hz, adjustable 415–466 Hz
- Tested with
- 58 studio recordings of 11 instruments (right note on about 95% of frames at normal volume) and test tones from B0 to C6
- Made by
- The Appcellent team
- Updated
- November 2026
Tuner not hearing you?
- Allow the microphone. If you blocked it: in Chrome or Edge, click the icon left of the address bar → Microphone → Allow, then reload. In Safari on iPhone, tap aA → Website Settings → Microphone → Allow. In Firefox, click the crossed-out microphone in the address bar. On a Mac, also check System Settings → Privacy & Security → Microphone for your browser.
- Open the page in Safari or Chrome. In-app browsers (Instagram, Facebook, TikTok) often block the microphone.
- Play one note at a time, louder. Point the microphone toward the bell or the instrument from about an arm’s length. A quiet room helps.
- Wrong octave or jumping notes? Let the attack fade for a moment — the reading settles once the note is steady.
- No microphone at all? Tap a reference note button to hear its note and tune by ear.
French horn tuning notes
Reference notes in concert pitch and as written for Horn in F.
| Concert pitch | Frequency | Written (Horn in F) |
|---|---|---|
| F4 | 349.23 Hz | C5 |
| B♭3 | 233.08 Hz | F4 |
| A4 | 440.00 Hz | E5 |
How to tune your french horn
- Warm up first.
- Press Start tuner and play a long written C on the F side.
- Adjust the main tuning slide: pull out to lower the pitch, push in to raise it.
- On most double horns, tune the B♭ side with the main slide, then the F side with its own F slide.
Horn in F transposition
Horn parts are written a perfect fifth higher than they sound. Choose Concert pitch in the settings if you want to see the sounding note instead.
Questions
What note does a French horn tune to?
Usually concert F (written C) or concert B♭ (written F).
How do I tune a double horn?
On most double horns the main slide tunes both sides: tune the B♭ side with the main slide first, then tune the F side with the separate F slide.