Online Cello Tuner
Tune your cello with your microphone or by ear. It uses standard C G D A, with rich bowed reference tones and fast detection of the low strings.
- Free, no sign-up
- Bowed reference tones
- Private, on-device
Reference pitch (A4)
Hz
Lower it in noisy rooms
Press Start tuning, then play a string
0/4 tuned
Standard notes
A4 = 440 Hz| String | Note | Frequency |
|---|---|---|
| 4 | C2 | 65.41 Hz |
| 3 | G2 | 98.00 Hz |
| 2 | D3 | 146.83 Hz |
| 1 | A3 | 220.00 Hz |
Cello tuning
The cello is tuned C G D A in fifths, one octave below the viola. Tune the A first, then D, G and C. Use the fine tuners for the last small adjustment.
Keyboard shortcuts
- Space Start or stop the microphone
- 1–9 Play a string’s reference note
- M Switch Auto / Manual mode
-
Start the tuner
Press Start tuning and allow access to the microphone. Hold your cello 20–50 cm from the mic.
-
Play one string
Pluck one string and let it ring. Auto mode shows the closest string. To stay on one string, switch to Manual.
-
Adjust the peg or fine tuner
If the needle is on the left, tighten the string to raise the pitch. If it is on the right, loosen it. Stop when the needle is in the middle and turns green.
Frequently asked questions
What are the cello string notes?
C2, G2, D3 and A3, from the lowest string to the highest, one octave below the viola.
How do I tune the low C string?
Bow the C string steadily for two seconds. Low strings take a moment to settle before the reading is steady.
Do orchestras tune to 440 or 442 Hz?
Both are common. Set the reference pitch in the tuner settings to match the group you play with.
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