Free Online Cello Tuner
Tune your cello online with your microphone through real-time pitch detection. Works with all four strings, C, G, D and A, and shows whether your note is flat, sharp or in tune.
Play a string
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Play cello with music you love. Play cello with music you love.
Practice with piano accompaniment
How to Use This Cello Tuner
- 1
Allow microphone access
Click Start and allow your browser to access your microphone.
- 2
Play one string at a time
Play the open C, G, D or A string so the tuner can detect its pitch.
- 3
Watch the pitch indicator
The tuner shows in real time whether your note is flat, sharp or in tune, so you can adjust the string accordingly.
- 4
Adjust the string slowly
Turn the tuning peg or fine tuner gradually until the indicator shows that the note is in tune.
Cello String Frequencies
Standard cello tuning uses the notes C, G, D and A. Most players tune to A4 = 440 Hz, while some orchestras and ensembles use A4 = 442 Hz as their reference pitch. The cello’s A string sounds one octave lower, at A3. The frequencies of the four open strings vary:
| String | Note | Frequency 440 Hz Standard | Frequency 442 Hz Brighter |
|---|---|---|---|
| 1st | A3 | 220.00 Hz | 221.00 Hz |
| 2nd | D3 | 146.83 Hz | 147.50 Hz |
| 3rd | G2 | 98.00 Hz | 98.44 Hz |
| 4th | C2 | 65.41 Hz | 65.70 Hz |
How to Tune a Cello Accurately
Accurate tuning of a cello is not only about reaching the right note. A stable sound, small adjustments and the right tuning technique all help you get a more reliable result.
- Bow a clear, steady note: Draw a full, even bow stroke and let the string ring. Low notes fade quickly when plucked, so a bowed note gives the tuner more to measure.
- Make small adjustments: Turn the fine tuner or peg gradually. Large movements can easily take the string past the correct pitch.
- Use fine tuners when you are close: Many cellos have a fine tuner on the A string, and student cellos often on all four. Use them for the last small corrections; on a string without one, make those corrections at the peg.
- Recheck the strings after tuning: Adjusting one string changes the overall tension on the cello slightly. Once all four strings are tuned, check C, G, D and A again and make any final corrections.
- Tune in a quiet environment: Background noise can make pitch detection less reliable, especially for the low strings. For the best result, tune somewhere quiet and keep your device close to the cello.
- Match the reference pitch you need: Most players use A4 = 440 Hz, while some orchestras and ensembles tune to 442 Hz. If you are playing with others, use the same reference pitch as the rest of the group.
Common Cello Tuning Problems
Having trouble getting a stable reading? These are the most common causes:
- No note detected: Check microphone access, play one open string clearly and reduce background noise.
- Low C string not recognized: Small microphones pick up very low notes less clearly. Bow the C string with a steady, full stroke and move your device closer to the instrument.
- Pitch keeps moving: Use a steady bow stroke and let the note settle for a moment before you adjust the string.
- Peg keeps slipping: Gently press the peg inward while turning it. If it still does not hold, the peg may need professional adjustment.
- Wrong note appears: The string may be far from its target pitch. Adjust it gradually until the tuner moves closer to C, G, D or A.
About the OKTAV Cello Tuner
The OKTAV Cello Tuner is a free online chromatic tuner that uses your device microphone for real-time pitch detection. It works directly in your browser with no download required and helps you tune the open cello strings C, G, D and A by showing whether a note is flat, sharp or in tune.
Once your cello is in tune, OKTAV has cello sheet music for every level: easy cello sheet music for beginners and the most popular cello sheet music, each available as a single purchase or in the subscription.
Cello Tuner FAQ
- Can I tune my cello online without downloading an app?
Yes. An online cello tuner works directly in your browser using your device microphone, so no app or installation is required.
- Is an online cello tuner accurate?
Yes, provided the microphone picks up a clear, steady note. For the best results, tune in a quiet environment, play one string at a time and keep the cello close to the microphone.
- Should I tune my cello with a bow or by plucking the strings?
Both work, but the bow is usually the better choice on the cello. A plucked low string fades quickly, while a steady bow stroke gives the tuner a long, stable note to measure.
- Why is the C string harder to tune?
The open C string sounds at only about 65 Hz, and small phone and laptop microphones pick up such low notes less clearly. Bow it with a full, even stroke and bring your device closer to the cello.
- How often should I tune my cello?
Check the tuning every time you play. Cellos can drift out of tune due to temperature changes, string tension and regular use.
- Can temperature or humidity affect cello tuning?
Yes. Changes in temperature and humidity can affect both the strings and the wooden instrument, causing the pitch to shift. A cello moved between a cold car and a warm room often needs retuning.