Pitch Detector
Detect the note you are singing or playing, see frequency in Hz, and check whether the pitch is flat, sharp, or in tune.
Allow microphone access, then sing or play one steady note.
Microphone audio is analyzed locally in your browser by this plugin. It is not uploaded for pitch calculation.
Recent stable pitches
Stored only for the current browser session.
Pitch detection can be affected by microphone quality, room noise, harmonics, vibrato and octave errors. This tool is designed for practical pitch checking, not laboratory measurement.
A Pitch Detector helps you identify the frequency and musical note of a sound in real time. Speak, sing, play an instrument, or produce a steady tone near your microphone, and the tool analyzes the incoming audio to estimate its fundamental frequency in hertz (Hz) and match it to the nearest musical note.
Use the Pitch Detector above when you want to check singing pitch, tune an instrument, compare notes, practice intonation, analyze tones, or understand the relationship between frequency and musical pitch. The tool runs directly in your browser and uses your microphone only while pitch detection is active.
If you already know a frequency and want to convert it manually, use the Hz to Note Converter to translate a frequency into its nearest note without microphone input.
How to Use the Pitch Detector
Using the tool is straightforward:
- Select or allow access to your microphone.
- Start the Pitch Detector.
- Produce one clear, steady note.
- Keep the sound reasonably consistent for a moment.
- Read the detected note and frequency.
- Check whether the pitch is sharp, flat, or close to the note center.
- Repeat with another note whenever needed.
For cleaner results, try to use the tool in a quiet room and keep the microphone reasonably close to the sound source.
Sustained notes are generally easier to analyze than speech, percussion, chords, or rapidly changing sounds because the detector needs a recognizable fundamental frequency.
What the Pitch Detector Shows
The main result is the musical note closest to the frequency detected from your microphone.
Depending on the current signal, the tool can show values such as:
- detected note
- frequency in Hz
- octave
- cents difference
- sharp or flat direction
- tuning position
- signal or detection status
Frequency tells you how many waveform cycles occur each second.
For example, 440 Hz means approximately 440 cycles per second. Under the common A4 = 440 Hz tuning reference, that frequency corresponds to the musical note A4.
You can explore frequency relationships in more detail with the Frequency Calculator, which calculates wavelength, period, octave relationships, and other frequency-based values.
How Pitch Detection Works
A microphone records a constantly changing audio waveform. The Pitch Detector analyzes short sections of that waveform and estimates the repeating pattern associated with the fundamental frequency.
Once a frequency has been estimated, the tool compares it with standard musical-note frequencies and selects the closest note.
For a simple sustained tone, this process can be very effective. Real-world sounds, however, contain much more than a single frequency.
A sung note or instrument tone usually contains:
- a fundamental frequency
- harmonics
- overtones
- background noise
- resonance
- transient information
The challenge for a pitch detector is to identify the fundamental rather than simply selecting the strongest frequency component.
Understanding Frequency and Musical Notes
Musical notes correspond to specific frequency relationships.
In twelve-tone equal temperament, moving up one octave doubles the frequency.
For example:
| Note | Approx. Frequency |
|---|---|
| A2 | 110 Hz |
| A3 | 220 Hz |
| A4 | 440 Hz |
| A5 | 880 Hz |
This doubling relationship is why 220 Hz, 440 Hz, and 880 Hz are all different octaves of A.
For quick conversion between measured frequencies and note names, the Hz to Note Converter provides a useful companion to the live detector.
What Do Cents Mean?
A cent is a small unit used to describe the distance between pitches.
One equal-tempered semitone contains 100 cents.
A cents reading helps show how close the detected pitch is to the center of the nearest note.
For example:
- 0 cents means the detected pitch is at the calculated center of the note.
- A negative cents value means the pitch is below the note center.
- A positive cents value means the pitch is above the note center.
For tuning or singing practice, try to stabilize the sound near the center rather than reacting to every tiny movement in the reading.
Natural voices and acoustic instruments rarely hold a perfectly fixed frequency from moment to moment.
Using the Pitch Detector for Singing
Singers can use the detector to practice matching individual notes and maintaining steady pitch.
Try singing a comfortable sustained vowel such as “ah” and watch how the displayed frequency and note behave.
Useful practice includes:
- matching a reference note
- sustaining one pitch
- checking whether a note starts sharp or flat
- comparing low and high notes
- observing pitch stability
A pitch detector identifies the frequency you are producing, but it does not determine your complete vocal classification, vocal health, or ideal singing range.
Using the Pitch Detector for Instruments
The tool can also analyze many monophonic instruments, including:
- guitar strings played individually
- violin
- bass
- flute
- saxophone
- piano notes played one at a time
- synthesizers
- whistles
- tuning forks
For the clearest result, play one note at a time.
Chords can confuse pitch detection because several fundamental frequencies and harmonics may be present simultaneously.
If your goal is frequency analysis rather than note detection, the Frequency Calculator may be more appropriate.
Why the Detected Pitch Moves Around
Small changes in the displayed frequency are normal.
Possible causes include:
- vibrato
- natural pitch instability
- background noise
- microphone quality
- room reflections
- instrument harmonics
- breath noise
- changing volume
- multiple sounds at once
A voice with vibrato intentionally moves above and below a central pitch, so the displayed frequency may fluctuate even when the singer is performing correctly.
The most useful reading is usually the stable center of the detected note rather than every individual movement.
Microphone Tips for Better Detection
If the tool struggles to detect your pitch, try these adjustments:
- Move closer to the microphone.
- Reduce background noise.
- Produce a longer, steadier tone.
- Avoid playing multiple notes simultaneously.
- Keep the sound loud enough to detect without clipping.
- Try another microphone if your device heavily processes the signal.
- Disable unnecessary audio processing where your browser or operating system allows it.
If microphone-based tools are behaving unexpectedly, the site’s troubleshooting guide can help identify browser and device issues.
Pitch, Frequency, and Latency Are Different
Pitch and audio latency describe different properties of sound.
Pitch relates primarily to frequency.
Latency measures delay through an audio system.
A signal can have a perfectly detectable pitch while still experiencing significant playback or recording delay.
If you are troubleshooting timing rather than note accuracy, use the Audio Latency Test. For wireless playback specifically, the Bluetooth Latency Test is designed for latency-focused testing.
Accuracy and Limitations
Browser-based pitch detection can provide useful real-time estimates, but the result depends on the quality of the incoming audio.
Detection may be less reliable with:
- chords
- percussion
- noisy recordings
- highly distorted audio
- very weak signals
- rapid note changes
- strong background noise
- sounds with an unclear fundamental frequency
Microphone hardware and device-level audio processing can also affect the incoming signal.
The tool should therefore be used as a practical pitch reference rather than laboratory frequency-measurement equipment.
Privacy and Microphone Access
The Pitch Detector requires microphone permission because it needs live audio to estimate pitch.
Audio processing occurs during the browser session for real-time analysis. The microphone is not required when the detector is stopped.
You can remove microphone permission at any time through your browser settings.
For more information about how browser-based tools on this site work, see How It Works and the site’s Data Security information.
Frequently Asked Questions
What is a Pitch Detector?
A Pitch Detector analyzes an audio signal and estimates its fundamental frequency, then matches that frequency to the nearest musical note.
Can I use the Pitch Detector for singing?
Yes. It can help you check sustained notes, pitch matching, intonation, and general pitch stability.
Can I use it to tune a guitar?
You can analyze one guitar string at a time. For best results, let each string ring clearly without other strings sounding.
What does Hz mean?
Hz, or hertz, means cycles per second. A 440 Hz tone completes approximately 440 waveform cycles each second.
What does cents mean in pitch detection?
Cents measure small pitch differences. There are 100 cents in one equal-tempered semitone.
Why does the note keep changing?
The detector may be receiving vibrato, background noise, several frequencies, weak audio, or an unstable note. Try producing a clearer sustained sound.
Why does my detected frequency move even when I hold one note?
Human voices and acoustic instruments naturally vary slightly in frequency. Vibrato, airflow, finger movement, resonance, and microphone processing can all cause small changes.
Can the Pitch Detector detect chords?
It is designed primarily for a single dominant pitch. Chords contain multiple notes, so the result may jump between frequencies or identify one dominant component.
Is this a professional tuning instrument?
It is useful for practice, reference, and everyday analysis, but dedicated calibrated measurement equipment may be preferable when exact laboratory or professional calibration is required.
Does the tool record my microphone audio?
The microphone is used during active pitch analysis. The tool is designed to process the incoming signal in the browser for detection rather than requiring an uploaded recording.