Trombone Tuner
Tune your trombone online with your microphone. The trombone reads in concert pitch, so the note on the tuner is the note on your music. Tune the first-position B♭ and check F.
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, 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.
Trombone tuning notes
Reference notes at A4 = 440 Hz. Tap a note under the tuner to hear it.
| Concert pitch | Frequency |
|---|---|
| B♭3 | 233.08 Hz |
| F3 | 174.61 Hz |
How to tune your trombone
- Warm up first — a cold trombone plays flat.
- Press Start tuner and play B♭ in first position.
- If you are sharp, pull the main tuning slide (on the bell section) out. If you are flat, push it in.
- Remember that first position is with the slide fully in, so the main tuning slide does the tuning.
Trombone and concert pitch
Tenor and bass trombones in B♭ read concert pitch in bass clef, so there is no transposition. Positions on the slide change pitch by about a semitone each, which makes the tuner useful for checking positions too.
Questions
What note does a trombone tune to?
Concert B♭ in first position. F is a good second check note.
Is the trombone a transposing instrument?
No. In bass clef the trombone reads and sounds concert pitch.