Free Online C Trumpet Tuner
Play a note — see exactly how in tune you are.
Allow microphone access to begin
How to use this tuner
Click Start Tuning and allow microphone access. Play a note — the tuner detects pitch in real time and shows how sharp or flat you are in cents.
The bar spans −50 to +50 cents. Zero is perfectly in tune. The history line shows where you’ve been — useful for catching pitch drift as embouchure tires on long orchestral phrases.
Concert Pitch (C) is selected — no transposition. Every note the C trumpet plays is shown exactly as the ensemble hears it. If you need Bb trumpet transposition, select Trumpet (B♭) from the dropdown.
Default is A440. Tap + / − to match your ensemble — A441–442 is common in orchestras, A415 for historical pitch.
The C trumpet is the standard in American orchestras and plays at concert pitch — no transposition offset. When you play a C, the tuner shows C, and the rest of the ensemble hears C. This is a meaningful practical difference from the Bb trumpet: a C trumpet player reading the same orchestral passage as a Bb player sees different note names on the page, because C trumpet parts are written at concert pitch while Bb parts are written a whole step higher. C trumpets tend to have a brighter, more penetrating tone in the upper registers, which is why they’re preferred for orchestral work where projection matters. Intonation tendencies are similar to the Bb: valve combinations involving all three valves (1+2+3) run flat on most instruments, and the open C tends sharp on many horns. The main tuning slide handles overall pitch; individual valve slides address specific problem notes. The pitch history display lets you monitor whether sustained orchestral notes drift across a long phrase — a common issue as air support fluctuates through a demanding passage.
Want the complete experience?
The Tunable app adds 15+ tuning temperaments, metronome, tone generator, recording, ear training, and more — all on your phone.
