Note Identifier
What note is this? Play or sing it into your microphone and the note name and octave appear instantly — C4, F#3, A2 — along with its frequency in hertz.
Cents from perfect pitch
Audio is analysed live in your browser and never recorded, stored or uploaded.
What is a note identifier?
A note identifier listens to a single sustained sound and tells you which of the twelve notes it is, and in which octave. Instead of guessing by ear or hunting across a keyboard, you hold the note and read the answer.
This one runs entirely in your browser. It reads your microphone, measures the fundamental frequency of the sound, and maps it to the nearest note in standard A4 = 440 Hz tuning. Notes are written in scientific pitch notation with sharps (C#, D#, F#, G#, A#), so middle C on a piano shows as C4.
Note frequency chart
Every note in octaves 2 to 5, in standard tuning (A4 = 440 Hz). Use it to see how far the frequency you're producing is from the note you're aiming for.
| Note | Octave 2 | Octave 3 | Octave 4 | Octave 5 |
|---|---|---|---|---|
| C | 65.41 Hz | 130.81 Hz | 261.63 Hz | 523.25 Hz |
| C# | 69.30 Hz | 138.59 Hz | 277.18 Hz | 554.37 Hz |
| D | 73.42 Hz | 146.83 Hz | 293.66 Hz | 587.33 Hz |
| D# | 77.78 Hz | 155.56 Hz | 311.13 Hz | 622.25 Hz |
| E | 82.41 Hz | 164.81 Hz | 329.63 Hz | 659.26 Hz |
| F | 87.31 Hz | 174.61 Hz | 349.23 Hz | 698.46 Hz |
| F# | 92.50 Hz | 185.00 Hz | 369.99 Hz | 739.99 Hz |
| G | 98.00 Hz | 196.00 Hz | 392.00 Hz | 783.99 Hz |
| G# | 103.83 Hz | 207.65 Hz | 415.30 Hz | 830.61 Hz |
| A | 110.00 Hz | 220.00 Hz | 440.00 Hz | 880.00 Hz |
| A# | 116.54 Hz | 233.08 Hz | 466.16 Hz | 932.33 Hz |
| B | 123.47 Hz | 246.94 Hz | 493.88 Hz | 987.77 Hz |
Each octave doubles the frequency: A2 is 110 Hz, A3 is 220 Hz, A4 is 440 Hz. Middle C is C4 at about 261.63 Hz, and the lowest string of a standard-tuned guitar is E2 at about 82.41 Hz.
Tuning an instrument and want to see how many cents sharp or flat you are? The pitch identifier is set up as a tuner. Need every note of a recorded melody instead of one at a time? Upload it to the music note finder.
When you need to know what note it is
Learning a song by ear
Hum the first note of a melody you can hear in your head, get its name, then find it on your instrument. Repeat note by note and the tune is written down.
Finding a note on guitar or piano
Pluck a string or press a key you're unsure about and see what it is. Handy when you're learning the fretboard or checking which string is which.
Knowing your singing notes
Sing your lowest and highest comfortable notes to find out where your voice sits — the octave number tells you exactly how high or low you went.
Naming a sound you hear
A doorbell, a hum from an appliance, a bottle you blew across — hold the phone near it and the note identifier puts a name to the pitch.
How to identify a note
1. Start and allow the mic
Press start and grant microphone access. The audio is analysed live and never recorded or uploaded.
2. Play or sing one note
Hold a single note steady for a moment. Chords and several notes at once can't be separated — play them one at a time.
3. Read the note
The big readout shows the note and octave. Check it against the chart above if you want the exact frequency of the note you should be hitting.
Note identifier FAQ
How do I find out what note I'm singing?
Press start, allow the microphone, and sing one steady note. The note name and octave appear in the large readout while you hold it. Sing a little louder and closer to the mic if nothing shows up.
What does the number after the note mean?
It's the octave, in scientific pitch notation. The octave number goes up by one at each C, so B3 is directly followed by C4. Middle C on a piano is C4, and A4 is the 440 Hz tuning reference.
Why does it show C# and never Db?
C# and Db are the same pitch on a piano or guitar — which name is correct depends on the key of the music, and a single note has no key. The identifier always uses the sharp name, so read D#, G# and A# as Eb, Ab and Bb when that fits your music.
Can it identify chords or several notes at once?
No. It tracks one pitch at a time, so a chord gives an unreliable reading. Play the notes of a chord one by one, or record the passage and use the music note finder to get the notes of a melody in order.
Why does it show the right note in the wrong octave?
Some sounds — low piano notes, guitars with strong overtones, a room with lots of echo — can pull the reading an octave up or down. Get closer to the microphone, play a clean sustained note and reduce background noise.
What range of notes can it detect?
Roughly A1 (55 Hz) up to about G6 (1600 Hz) — from bass guitar through soprano voice and most lead instruments. Notes outside that band won't register.
Is my audio recorded or uploaded?
No. The microphone stream is analysed frame by frame in your browser and discarded immediately. Nothing is stored or sent anywhere, and stopping the tool releases the microphone.
Find out what note it is.
Sing, hum or play — the note name appears as you hold it.
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