Cello tuner
Pluck a string — the tuner recognises it and shows whether to tighten or loosen it. It works with your microphone right in the browser; the sound is never uploaded.
Microphone needed
Sound is analysed right in your browser and never uploaded. The browser will ask for permission once.
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turn on the microphone
Auto: the string is detected automatically. Tap a string to hear its note — the tuner will then listen only to it.
A reference: 440 Hz
Cello tuning
The cello is tuned in fifths C G D A — one octave below the viola.
- 4th string — C2, 65.41 Hz
- 3rd string — G2, 98 Hz
- 2nd string — D3, 146.83 Hz
- 1st string — A3, 220 Hz
How to tune a cello online
- Press "Turn on microphone" and allow access — the sound is processed right in your browser and never uploaded.
- Pluck one string. The tuner recognises it and the needle shows how far it is below or above the note.
- Needle left of centre — the string is flat, tighten the peg. Right — it is sharp, loosen it. The green zone (±5 cents) and a check mark mean the string is in tune.
- Prefer tuning by ear? Tap a string in the list to hear its note.
- Start with the A string (220 Hz), then D, G and C.
- Put your phone near the f-holes: low strings are heard better that way.
Frequently asked questions
What are the cello string frequencies?
C2 — 65.41 Hz, G2 — 98 Hz, D3 — 146.83 Hz, A3 — 220 Hz.
Will a laptop microphone work?
Yes, but for the lowest C place the cello closer or tune with a harmonic — the tuner understands it.