Trumpet Tuner
Tune your trumpet online with your microphone. The tuner shows the written note for a B♭ trumpet: a written C sounds a concert B♭. Bands usually tune to concert B♭ (B♭4, or B♭3 an octave lower).
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.
Trumpet tuning notes
Reference notes in concert pitch and as written for a B♭ instrument.
| Concert pitch | Frequency | Written (B♭ instrument) |
|---|---|---|
| B♭4 | 466.16 Hz | C5 |
| B♭3 | 233.08 Hz | C4 |
How to tune your trumpet
- Warm up for a few minutes before tuning.
- Press Start tuner and play a long, relaxed written C.
- If you are sharp, pull the main tuning slide out. If you are flat, push it in.
- Check a few more notes; use the 1st and 3rd valve slides for notes that run sharp.
Written pitch on a B♭ trumpet
The B♭ trumpet sounds a whole step lower than written, so the band’s concert B♭ is a C on your music. If you play a C trumpet, choose C trumpet in the settings and the tuner shows concert pitch.
Questions
What note does a trumpet tune to?
Concert B♭, which is a written C on a B♭ trumpet.
Which slide tunes a trumpet?
The main tuning slide. Pull it out to lower the pitch and push it in to raise it.