Violin Cello CGDA Tuner — Tune to Cello CGDA in Your Browser

Cello standard tuning is CGDA, low to high — C2, G2, D3, A3. The same letter names as viola but an octave lower. The cello is tuned in perfect fifths like the rest of the violin family, with the lowest C2 sitting an octave below the viola's open C and a fifth below the bass guitar's open A. The highest A3 sits at 220 Hz, well below the violin's open A and an octave below the viola's open A.

The cello carries the tenor and bass roles of the string section in classical music. Its open C is one of the deepest sustained pitches in chamber music — capable of grounding an entire string quartet — while the higher A and D strings can carry singing melodic lines that approach the warmth of a baritone voice. Solo cello repertoire from Bach onwards exploits the entire range, often in a single movement, which is part of why the instrument is one of the most expressive in the orchestra.

Outside classical, cello appears in singer-songwriter, folk, contemporary, and film score arrangements wherever a warm, sustained mid-bass voice is needed. The fifth-based tuning produces the same scale and arpeggio fingering geometry as violin and viola — fingers do not transfer one-to-one because the spacing is much wider, but the conceptual map is identical. Many string players who started on violin find the cello fingering logic immediately readable, even if the physical execution requires retraining.

If you are picking up a cello after another bowed instrument, the first physical adjustment is body posture — the cello sits between the legs, not on the shoulder, which changes left-hand position and bow angle entirely. Tuning is the same fifths-based listening exercise: tune the A string first to a reference, then tune each adjacent string by listening to a clean perfect fifth between two open strings. The first practice is open-string bowing to feel the resistance of each string, especially the heavy C, before any fingerwork.