Sing or play one clear note and use the Online Pitch Detector to identify its nearest musical note, octave and frequency in Hertz (Hz). The live reading also shows whether the sound is sharp, flat or close to the selected tuning reference. Start the microphone test below, hold a steady sound, and let the display settle before judging the result. The tool is for a single dominant pitch, whether it comes from your voice or an instrument.
Real-time note and frequency tool
Pitch Detector
Sing or play one clear note to detect the nearest musical note, octave, frequency in Hz, and sharp or flat tuning context.
Use one steady voice or instrument note. Chords, background music, and noisy rooms can confuse detection.
The microphone signal is processed in your browser during the test. This plugin does not send audio to a server.
Results are educational estimates. Microphone quality, distance, volume, and unstable pitch can affect readings.
Related Pitch Tools
The live detector listens to a sound through your microphone. If you already have a number or note rather than a live sound, use the appropriate separate tool:
- Hz to Note Converter — enter a known frequency to find the nearest note.
- Note Frequency Calculator — start with a note name and calculate its frequency.
- Audio File Pitch Detector — the separate page for audio-file pitch detection; the live microphone test on this homepage does not accept a file.
For a broader explanation of how the microphone tool works, read How It Works.
How to Detect the Pitch of a Voice or Instrument
Start with one clear note
Choose a quiet place, select Start Pitch Detection, and grant microphone access in your browser. Sing a sustained vowel or play one instrument note or string. Hold the sound for a moment and watch the displayed note and Hz value settle. A chord, several instruments playing together, percussion or loud background music can produce a changing or misleading reading because this tool is intended to follow one prominent pitch.
If you are testing your voice, sing at a comfortable volume. If you are testing an instrument, play a single clean note and let it ring. You do not need to play more loudly than normal; moving the microphone away from a very loud source may produce a clearer result.
Read the result, then retest when needed
Read the note letter and octave number, then check Hz, cents and tuning status. If the note changes rapidly, try a steadier sound, reduce background noise, or adjust microphone distance. Stop ends the microphone session; Reset clears the displayed test state. The tool also offers Copy Result when you want to save a reading.
Microphone access is unavailable? The current tool includes a Manual Hz input: enter a frequency you already know and choose Convert Hz to Note. This converts a number you supply; it does not analyze a recording or discover an unknown frequency for you. For more help with input and permissions, visit Troubleshooting.
What Your Pitch Detector Result Means
The result combines several pieces of information. A note name alone may be enough to identify a key on a keyboard, but the octave and tuning information make the reading more useful.
| Reading | Meaning | What to check |
|---|---|---|
| Detected note | The nearest musical note to the sound, such as A4 or F#3. | Does the letter match what you expected? |
| Octave | The pitch register attached to the note name. | A3 and A4 share a letter but are one octave apart. |
| Frequency (Hz) | The estimated number of sound cycles per second. | A higher stable frequency usually means a higher pitch. |
| Cents | Fine distance from the nearest reference note. | The sign and tuning display indicate whether the sound is above or below it. |
| Tuning status | A quick sharp, flat or in-tune interpretation. | Hold the note steady before making a small correction. |
| Stability | Context for how steady the detected pitch is. | A jumping reading deserves another test. |
The detector reports the pitch it hears at that moment. It cannot identify which note you intended to sing or play, and it cannot decide whether a musical performance sounds good. If you need help understanding labels such as C4 and F#3, see Scientific Pitch Notation Explained or Vocal Pitch Explained.
Example: Reading A4 at 440 Hz
A4 at 440 Hz is a familiar reference pitch. If the detector hears a steady sound close to that frequency with its A4 reference set to 440 Hz, it should identify A4 and show a cents value near zero. A slightly higher reading can still be named A4 while appearing sharp; a slightly lower reading can still be named A4 while appearing flat. The exact cents value depends on the measured frequency and selected reference.
This example explains how to interpret a display; it is not a claim that every microphone will read exactly 440.00 Hz from a played A4. Check the A4 reference selection if you are comparing with a tuning standard different from the one you expect. For a table of note frequencies, use the Music Note Frequency Chart.
Note, Octave, Hz and Cents: Four Different Questions
What note is this? The note label answers with a letter, optional sharp or flat, and octave number. How high is the sound? The Hz reading expresses its estimated fundamental frequency. Which register? The octave number distinguishes, for example, A3 from A4. How close is it to the nearest note center? Cents and tuning status answer that finer question.
These values are related, but they are not interchangeable. Two sounds can have the same nearest note name and different cents readings. Two notes can share the letter A yet sit an octave apart. A sound with a strong harmonic can also confuse a microphone detector into showing the wrong octave. Check all parts of the result together before changing your tuning or singing technique.
For the underlying ideas, read Pitch vs Note and Pitch vs Frequency. The Hz to Note Converter is useful when your starting point is a known frequency rather than a live sound.
Use the Detector for Singing and Instrument Practice
For singing, play or imagine a target note, sing it on a sustained vowel, and compare the detected note with your target. Watch whether the pitch remains steady. If the display says sharp or flat, make a small, comfortable adjustment and test again. Vibrato naturally changes the reading over time, so look for a consistent center instead of trying to freeze every moment at zero cents.
For instruments, play one note at a time. Check both the note letter and octave before using the tuning direction. If a string or note is far from the expected pitch, a fine sharp/flat adjustment alone is not enough; first make sure you are reading the right octave and intended string or key.
For learning notes by ear, predict a note before you check it. Then compare your guess with the result and repeat with another clear sound. The detector gives feedback; the listening task is still yours. The guide How to Tell What Note Is Playing goes deeper into that process.
Why Is the Note Jumping or Showing the Wrong Octave?
A live pitch estimate can move when the sound itself moves. This is common with vibrato, sliding between notes, a breathy voice or an instrument attack. It can also move when room noise competes with the note, the microphone is too close to a loud source, or another sound is playing. Try holding a single pitch after the initial attack and read the display when it has settled.
If the letter looks right but the octave does not, repeat with a sustained note and less background sound. Musical sounds contain harmonics above their fundamental frequency; a weak fundamental or strong harmonic can sometimes lead a detector to the wrong octave. Compare the Hz value with the expected register before trusting the label. The focused guide on wrong-octave readings explains this issue further.
If readings remain unstable, use the unstable-readings guide and check your browser microphone permission. Do not treat one brief, unexpected number as a reliable result.
What This Tool Can and Cannot Detect
The homepage tool is designed for a live microphone input with one dominant musical pitch. It can estimate a nearest note, octave, Hz and tuning context for a clear voice or instrument tone. It may struggle with chords, several singers, percussion, background music or sounds that have no stable pitch. It does not transcribe a song into notes or identify a musical key from an entire recording.
Queries such as pitch detector MP3 and pitch detector from file describe a different task from listening through a live microphone. The homepage microphone mode does not perform file analysis. Keep file-based intent on the separate Audio File Pitch Detector page rather than describing this homepage as an MP3 uploader.
Frequently Asked Questions
Can this detector tell me what note I am singing?
Yes. Sing one clear, steady note into your microphone and read the nearest note name and octave. A moving sung pitch can make the live display change, so hold the note before judging it.
Can I use it with a guitar, violin or piano?
Yes, for an individual clear note. Play one note or string at a time and compare the note name, octave, Hz and tuning direction. A chord may not produce a reliable single-note result.
Does it detect pitch from an MP3 or uploaded audio file?
The homepage test uses the microphone; it does not offer file upload in its displayed controls. For file-based intent, go to the separate Audio File Pitch Detector page. Playing a file aloud near a microphone is still a microphone test and can be affected by speakers and room sound.
Why does it show the correct letter but the wrong octave?
The sound’s harmonics or a weak fundamental can confuse octave detection. Sustain a single note, reduce competing sound, and compare the Hz value with the expected register before retesting.
What do sharp and flat mean here?
They describe whether the detected frequency is above or below the nearest note’s reference frequency. Cents show the finer distance. Check your selected A4 reference and wait for a steady reading.
Method, Privacy and Limits
The tool estimates the fundamental pitch of microphone input and maps it to a musical note relative to the selected tuning reference. Its usefulness depends on the sound, microphone, room and input level. A browser result is a practical musical estimate, not a measurement of vocal health or a guarantee of studio-level calibration. The How It Works page documents the site’s stated method; Pitch Detector Accuracy discusses the limits in more detail.
The site states that microphone audio is analyzed in the browser. Before publishing a firm privacy assurance on this homepage, confirm that the installed detector plugin matches that description. You can review the Privacy Policy and contact the site through Contact if a result or explanation appears wrong.