What note is this? This free note finder tells you in real time. Play, sing, hum or whistle one note into your microphone and it identifies the note name and octave, shows it on a treble and bass clef staff and a piano keyboard, and gives the frequency in Hz and how many cents sharp or flat it is. Play a melody and it writes the notes down in order.
Note Finder
What note is this?
– Hz · – cents
Play or sing one note
Microphone off. Nothing is recorded or uploaded: sound is analysed in your browser.
Notes you played
0 notes- Each note you hold for a moment is added here, in order.
Notes in the file
| Time | Note | Hz | Cents | Length |
|---|
Settings
Related Tools
- Pitch Detector
Exact pitch in Hz and cents with a live pitch graph.
- Singing Note Detector
What note am I singing? Hold a note and it locks.
- Chromatic Tuner
Tune any instrument to the nearest note.
- Frequency to Note Converter
Type a frequency in Hz and get the note.
- Song Key Finder
Find the key of a whole song.
- Scale Finder
Find which scales contain your notes.
How to Find the Note of Any Sound
- Press Start and allow the microphone. The note finder first listens to the room for a moment.
- Play or sing one note at a time and let it ring for about half a second.
- Read the note name and octave (for example A4), see where it sits on the staff and which key lights up on the piano, and check the cents to see if it is in tune.
- Keep playing: every note you hold is added to Notes you played. Press Play the notes to hear them back or Copy notes to paste them anywhere.
- Press any piano key to hear that note, which is handy for checking a note by ear.
Nothing is recorded or uploaded: the sound is analysed in your browser, on your phone or computer.
Reading the Result: Note Name, Octave and Staff
| You see | What it means |
|---|---|
| Letter (C, D, E, F, G, A, B) | The note name. Sharps (♯) and flats (♭) are the black keys between them. |
| Octave number | Which octave the note is in. C4 is middle C; the octave number goes up at every C. |
| Staff | Notes from middle C up are written on the treble clef, lower notes on the bass clef; middle C sits on its own short line between them. |
| Hz | The frequency of the note. A4 is 440 Hz; each octave up doubles it. |
| Cents | How far you are from the exact note: 100 cents make a semitone, and within ±5 cents sounds in tune. |
The frequency of every note from the lowest piano key to the highest is in the musical note frequency chart.
What Notes Are These? Identify a Melody
To work out a tune, play or sing it slowly, one note at a time. Each note you hold for a moment appears in order as a chip and on the staff, so you get the melody as notes you can read, copy or play back. A repeated note is added again when you stop between the two notes. Use Remove last to undo a wrong note and Clear to start a new phrase. For practice at naming notes by ear, try the pitch matching game and interval ear training.
Identify the Notes in an Audio File
Open the Audio file tab and choose a recording (MP3, WAV, M4A or OGG, up to 50 MB and 10 minutes). The note finder lists every note it hears with its start time, length and cents, puts the first notes on the staff and lets you download the list as a CSV file. Press play and the display follows the recording. It works best with one voice or instrument: an isolated vocal, a solo melody or your own practice recording. Chords and loud backing tracks have no single note to read.
Note Finder for Trumpet, Clarinet, Saxophone and Horn
Transposing instruments read different notes from the ones they sound. Choose your instrument in Settings and the note finder shows the written note from your music, and the concert pitch beneath it.
| Instrument | Key | Written note vs sounding note |
|---|---|---|
| Trumpet, clarinet | B♭ | Written a whole step (2 semitones) higher: concert B♭ is written C |
| Tenor saxophone | B♭ | Written a major ninth (14 semitones) higher |
| Alto saxophone | E♭ | Written a major sixth (9 semitones) higher: concert C is written A |
| French horn | F | Written a perfect fifth (7 semitones) higher |
| Piano, guitar, violin, flute, voice | C | No change: the written note is the note you hear |
Choosing the instrument also sets the note range, which makes readings steadier and prevents octave errors on low or high instruments. To tune rather than name notes, use the instrument tuners.
Do Re Mi Note Names
If you learned music with solfège, set Note names to Do Re Mi. The note finder then uses fixed-do names, as in Spanish, Italian, French and Portuguese music teaching:
| Letter | C | D | E | F | G | A | B |
|---|---|---|---|---|---|---|---|
| Do-Re-Mi | Do | Re | Mi | Fa | Sol | La | Si |
Tips for Accurate Note Identification
- Play or sing single notes; the note finder names one note at a time, not chords.
- Use a quiet room and keep the microphone 20–50 cm from the sound.
- On piano and guitar, let the note ring for a moment: the first attack is noisy.
- If a note shows an octave too high or low, choose your instrument or Voice in Settings.
- For humming or singing, the Voice setting works best.
Frequently Asked Questions
What note is this?
Press Start and play or sing the note: the big letter and number show the note, the staff shows where it is written and the piano key lights up.
Can I identify a note by sound online?
Yes. The note finder identifies notes from your microphone or from an audio file, free, with no app and no sign-up.
Why does it show a different note from my trumpet or sax music?
Your instrument is transposing. Choose it in Settings and the note finder shows the written note.
Is it accurate?
For a clear single note it is accurate to a few cents, far less than the semitone between two notes. Background noise and chords are the main sources of error.