Free Online Chromatic Tuner
Play or sing any note into your microphone and the tuner instantly shows the note name, exact Hz frequency, and how many cents sharp or flat you are. Works for any instrument.
Click Start Tuner and play or sing a note…
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How to Use This Tuner
- Click Start Tuner and allow microphone access when prompted.
- Play or sing a single, clean note and hold it steady for at least one second.
- The large display shows the nearest chromatic note name (e.g. A4) and the exact Hz reading below it.
- The cents meter shows how sharp (+) or flat (−) you are. Adjust your instrument until the needle centers on green (±5 cents).
Chromatic Scale Frequency Reference
The table below shows the standard equal-tempered frequencies (A4 = 440 Hz) for all 12 chromatic notes across three common octaves. Use this as a reference when tuning without a microphone or verifying your instrument against specific Hz targets.
| Note | Octave 3 (Hz) | Octave 4 (Hz) | Octave 5 (Hz) |
|---|---|---|---|
| C | 130.81 | 261.63 | 523.25 |
| C# | 138.59 | 277.18 | 554.37 |
| D | 146.83 | 293.66 | 587.33 |
| D# | 155.56 | 311.13 | 622.25 |
| E | 164.81 | 329.63 | 659.26 |
| F | 174.61 | 349.23 | 698.46 |
| F# | 185.00 | 369.99 | 739.99 |
| G | 196.00 | 392.00 | 783.99 |
| G# | 207.65 | 415.30 | 830.61 |
| A | 220.00 | 440.00 | 880.00 |
| A# | 233.08 | 466.16 | 932.33 |
| B | 246.94 | 493.88 | 987.77 |
A4 = 440 Hz (ISO 16 concert pitch standard). Each octave doubles the frequency.
Supported Instruments
This chromatic tuner works for any instrument that produces a clear, sustained single-note tone. The table below shows the approximate playable range for common instruments.
| Instrument | Range | Frequency |
|---|---|---|
| Guitar (standard) | E2–E6 | 82–1319 Hz |
| Bass Guitar (4-string) | E1–G4 | 41–392 Hz |
| Ukulele (standard) | G4–A5 | 392–880 Hz |
| Violin | G3–E7 | 196–2637 Hz |
| Viola | C3–E6 | 131–1319 Hz |
| Cello | C2–A5 | 65–880 Hz |
| Flute | C4–C7 | 262–2093 Hz |
| Trumpet | F#3–D6 | 185–1175 Hz |
Tuner vs Pitch Detector — When to Use Which
Use This Tuner When…
- • You want to tune an instrument to concert pitch
- • You need cents-accurate deviation feedback
- • You are checking intonation on a specific note
- • You are matching a reference pitch (e.g. A440)
Use the Pitch Detector When…
- • You want to identify what note you are singing
- • You are checking your vocal range and voice type
- • You want a live pitch curve for intonation training
- • You are comparing a live take to a recorded reference
Frequently Asked Questions
A chromatic tuner detects any of the 12 notes in the chromatic scale across all octaves. Unlike instrument-specific tuners, it works for any instrument — guitar, bass, violin, ukulele, winds, and more.
Click Start Tuner, allow microphone access, and play a single note. The display shows the nearest note name, the Hz frequency, and the cents deviation. Adjust your instrument until the meter shows green.
A guitar tuner is preset to match the 6 standard guitar strings and highlights which string you are closest to. A chromatic tuner identifies any note name and works for any instrument or tuning.
A cent is 1/100 of a semitone. A +15 cent reading means you are 15/100 of a semitone sharp. A deviation of ±5 cents or less is considered in tune for most musical purposes.
Yes. A4 = 440 Hz is the ISO 16 international standard used by most instruments and ensembles. This tuner uses 440 Hz as its reference pitch.
Yes. Standard 4-string bass guitar tuning is E1 (41.20 Hz), A1 (55.00 Hz), D2 (73.42 Hz), G2 (98.00 Hz). Pluck each string cleanly and let it sustain for the best reading.
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