What note am I singing? Press Start listening, sing or hum one steady note, and this singing note detector shows the note name with its octave (for example A3), the frequency in Hz and how many cents sharp or flat you are, live from your microphone.
Every note you hold for about half a second is added to a list of the notes you sang. It works for singing, humming, whistling or a single-note instrument, one note at a time.
Singing Note Detector
Sing, hum or play one note and see which note it is, its frequency in Hz and how many cents sharp or flat you are, live.
Press Start listening and allow microphone access. Sound is analysed in your browser; nothing is recorded or uploaded.
Notes you sang
None yetHear a note, then sing it and watch the needle. While the note plays, the detector ignores the microphone.
Works with singing, humming, whistling or a single-note instrument, one note at a time. It cannot name the notes of a chord. Standard tuning, A4 = 440 Hz. A guide for practice, not a medical test.
Related Tools
- Vocal Range Test
Find your lowest and highest notes and the voice type they suggest.
- Pitch Accuracy Test
Hear a target note, sing it back and get a score out of 100.
- Singing Grader
Sing and get your voice rated from 1 to 10.
- High Note Test
Find the highest note you can sing and hold.
- Voice Frequency Test
Measure the pitch of your speaking voice in Hz.
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Browse every singing test and tool on the site.
How to Find the Note You Are Singing
- Press Start listening and allow microphone access when your browser asks.
- Sing or hum one note on an open vowel such as “ah” or “mm” and hold it steadily for about half a second.
- Read the big note name, for example A3, with the frequency in Hz below it. The needle shows whether you are flat (left) or sharp (right) of that note.
- Keep singing. Each note you hold appears under Notes you sang, with how many cents off it was. Press Copy notes to keep the list, or Clear list to start again.
- Optional: choose a note under Play a reference note (C2 to C6) and press Play note to hear it, then sing it back and watch the needle. While the tone plays, the detector ignores the microphone.
- Press Stop when you are done. The microphone is switched off, and your list stays on the page until you reload or close it.
Understanding Your Results
- Note now: the nearest note to the pitch you are singing, with its octave number. Black-key notes also show their flat name, for example C#4 (Db4).
- Hz: the frequency of your voice, the number of vibrations per second. Higher notes have higher frequencies, and each octave up doubles it.
- Cents and needle: 100 cents make one semitone. Minus means flat, plus means sharp. The green zone is ±10 cents, which this tool shows as in tune. At 50 cents you are halfway to the next note, so the note name changes.
- Last held note: the note you held most recently, with its cents, Hz and how long you held it.
- Notes you sang: every held note in order, plus your lowest and highest held note.
- Status line: Listening, Note detected, No clear note (noise, breath or more than one note at once), No sound (check the microphone) or Playing reference note.
How This Tool Works
About 30 times a second the detector takes a short slice of microphone sound (about 45 milliseconds) and finds how often its wave repeats, using YIN, a standard pitch-detection method. That gives the frequency: f = sample rate ÷ repeat length. The frequency is turned into a note number with n = 69 + 12 × log2(f ÷ 440), where 69 is A4 at 440 Hz and 60 is middle C. The nearest whole number is the note, and cents = 100 × (n − that note).
- Clarity check: a slice counts only when its wave repeats clearly. Noise, breath and chords usually fail this check, so the tool shows nothing rather than a wrong note.
- Smoothing: the display uses the middle (median) of the last five readings, which hides one-off glitches.
- Octave guard: the most common detector mistake is a sudden jump of exactly one octave. A jump like that has to last about 0.13 seconds before it is shown, which filters out glitches but still follows a real octave leap.
- Held notes: a note is listed when it stays within 60 cents of the same note for 0.4 seconds, so passing notes and slides are not listed. The listed value is the median pitch with the first fifth of the note skipped, where singers often slide in.
- Range: 55 Hz (A1) to 2,200 Hz (just above C7), from low bass notes to whistle notes. Standard tuning, A4 = 440 Hz.
Quick Reference: Note Frequencies
| Note | Frequency (Hz) | Where it sits |
|---|---|---|
| C2 | 65.4 | Low bass notes |
| E2 | 82.4 | Lowest note of many bass parts |
| A2 | 110.0 | Low male voice |
| C3 | 130.8 | One octave below middle C |
| A3 | 220.0 | Comfortable for many male voices |
| C4 | 261.6 | Middle C |
| E4 | 329.6 | Comfortable for many female voices |
| A4 | 440.0 | Tuning reference (concert pitch) |
| C5 | 523.3 | One octave above middle C |
| A5 | 880.0 | High female voice |
| C6 | 1,046.5 | Soprano high C |
Each octave doubles the frequency: A3 is 220 Hz, A4 is 440 Hz and A5 is 880 Hz. For every note across the typical singing voices, see the vocal range notes chart.
Note Detector, Pitch Detector or Pitch Test?
A pitch detector measures the frequency of a sound. A note detector goes one step further and names the nearest note. This tool does both: the Hz reading is your pitch, the note name is the nearest note in standard tuning, and the cents show the gap between them. If you want a voice pitch test that tells you which notes your voice is producing, this is the tool to use.
Two related tools do different jobs. The Pitch Accuracy Test plays target notes and scores how close you sing them back, with a score out of 100. The Voice Frequency Test measures the Hz of your speaking voice rather than sung notes. Both are in Related Tools above.
Octave Numbers: Why Middle C Is C4
The tool uses scientific pitch notation: middle C is C4 (261.6 Hz), and the octave number goes up at every C, so B3 is followed by C4. Some keyboards and music apps label middle C as C3 or C5 instead. If another app disagrees with this tool by exactly one octave, the difference is in the naming, not in your voice.
Men singing along with a woman’s song usually sing an octave lower than the recording. The detector names the octave you actually sing, so a man may see A3 where the singer on the track sings A4.
Tips for an Accurate Reading
- One note at a time. The detector is not polyphonic. It cannot name the notes of a chord or pick the melody out of a song with backing music. Two notes at once can show no note, or a wrong, lower note.
- Use a clear tone. An open “ah”, a hum or a whistle works best. Whispering, very breathy singing and vocal fry often show “No clear note”.
- Keep it quiet. Turn off music, move away from fans and hold your phone or microphone at arm’s length. Headphones stop the reference tone from reaching the microphone.
- Vibrato is fine. The needle swings with it, but a held note is listed at the centre of the vibrato.
- Unprocessed sound. The tool asks the browser to switch off echo cancellation, noise suppression and automatic volume, which can bend pitch readings. Some browsers and headsets may still apply them.
When Should You Use Note Detection?
- Find the starting note of a song: sing its first note, read it, then play that note with the reference tone to check.
- Check a choir part: make sure you are holding your written note before rehearsal.
- Learn note names by ear: sing, guess the note, then look.
- Find your comfortable notes: the notes you hold most easily show where your voice likes to sit, which singers call your tessitura.
- Notice register changes: watch which note you are on when your voice moves between chest voice and head voice.
- See your lowest and highest held notes: the list shows them as you go. For a guided test of your full range and voice type, use the Vocal Range Test.
Microphone and Privacy
The sound is analysed in your browser as it arrives. The detector does not record, upload or save your voice, and it sends nothing to a server. The list of notes exists only on the open page and is gone when you reload or close it. The microphone needs a secure (https) page and your permission; press Stop to switch it off. Read the privacy policy and how our tests measure pitch for the whole site.
Singing Note Detector FAQ
What note am I singing?
Press Start listening and hold one note for about half a second. The large name, such as A3, is your note: A3 is the A below middle C, at 220 Hz. The needle shows how many cents sharp or flat you are.
Can it find the notes of a song or a chord?
No. It follows one note at a time from your voice or one instrument. Chords and songs with backing music can show no note or a wrong one.
Why does it show a different octave than I expected?
Usually because apps number octaves differently (this tool calls middle C C4), or because you are singing an octave below or above the recording you are copying.
How many cents off is out of tune?
The reading turns green within ±10 cents. At 50 cents you are halfway to the next note. For a scored check against target notes, use the Pitch Accuracy Test.
Does it work for humming, whistling or instruments?
Yes, one note at a time between 55 Hz and 2,200 Hz. That covers low bass notes up to whistle notes and most single-note instruments in that range.
Is this a pitch detector?
Yes. It shows your pitch in Hz, the nearest note and the cents between them, updated about 30 times a second.
Is my voice recorded or uploaded?
No. Sound is analysed in your browser as you sing and is not recorded, uploaded or stored by the tool.