Perfect fifths, a fifth below a violin
A viola is tuned C3–G3–D4–A4— the same perfect-fifth spacing as a violin, shifted down by a fifth, sharing its top string. It’s the only instrument in the orchestral string family read primarily in alto clef(the C-clef centered on the staff’s middle line, marking that line as middle C) rather than treble or bass — a real, everyday consequence of sitting in the exact middle of the family’s range. None of that changes what this tuner listens for: it names the sounding pitch regardless of what clef your part is written in.
Convention says tune the A string first, exactly as on a violin: it’s the note the oboe gives the orchestra, and at A4 = 440 Hz it sits at the center of every tuner’s comfort zone. The other three strings — D, G, and the thick, wound C — are then checked against it.
Tune the A first, then D, G, C. Bow each string for a few seconds rather than plucking — a sustained bowed tone gives the tuner a far steadier reading, especially on the C.
Pegs for the big moves, fine tuners for the last few cents
- Check all four strings first with the tuner above. If a string is close — within about a quarter tone — the fine tuners at the tailpiece can do the whole job without touching a peg.
- For bigger drops, use the peg — while bowing or plucking constantly. Press the peg firmly into the pegbox as you turn (pegs hold by friction alone), sneak up to just below the note, then finish with the fine tuner.
- Give the C string extra time.It’s the thickest, highest-tension string on the instrument, usually wound rather than plain gut or steel, and it settles into pitch more slowly than the other three after a peg move — bow it for a few seconds before trusting the reading, not just the first attack.
- Re-check the A after tuning the others. Four strings over a floating bridge shift each other more than a fretted instrument ever has to deal with, and the C in particular can pull the bridge slightly as it settles.
Sizing: inches, not fractions
A violin has a fixed 4/4 full size, roughly 14 inches of body length, and every smaller size is a defined fraction of it. A viola never got that standardization — instruments are sold and described by their body length in inches, and adult “full size” violas span roughly 15 to 16.5 inches, occasionally more. A bigger body generally gives a richer, more resonant C string at the cost of being physically harder to reach across; a smaller one is easier to play but can sound thinner down low. Student sizes run smaller still, down to around 12 inches. None of this changes the target pitches above — C3 is C3 on any size — only the stretch your left hand has to make to find them.
Equal temperament vs. tuning by ear inside a chord
Like a violin, a viola has no frets forcing it toward equal temperament — the open strings are conventionally tuned in pure, beat-free fifthsby ear, which sit roughly 2 cents wider than the equal-tempered fifths this digital tuner reports. That’s not a flaw in either method: use the tuner to set the A accurately against a concert reference, then tune D, G and C to it by listening for the beats between adjacent strings to disappear, which is more precise than chasing a centered needle on each string individually. Once you’re playing rather than tuning open strings, the same expressive-intonation logic applies as on any bowed instrument — thirds sit low, fifths sit high, relative to this equal-tempered grid — which our guide to cents covers in full.
Frequently asked questions
Is this different from the violin tuner?
Same tuning engine, different instrument. A viola is C3–G3–D4–A4 rather than a violin’s G3–D4–A4–E5 — a fifth lower, same top A string, same peg-then-fine-tuner mechanism. We used to fold viola into the violin page as a second tab; it now has its own targets, its own sizing section and its own wolf-tone note, because those genuinely differ from a violin’s.
What is a wolf tone, and is it a tuning problem?
No — leave the tuner out of it. A wolf tone is the body of the instrument resonating uncontrollably at one particular pitch, causing a warble or growl that no amount of peg or fine-tuner adjustment fixes, because the string itself is at the correct pitch. It's common on violas (and cellos), often somewhere near C or C♯ a couple of octaves up, though the exact note is unique to each instrument's body dimensions. Players manage it with bow technique, a wolf-tone eliminator clamped to the string behind the bridge, or simply by knowing which note on their specific instrument does it.
Why don't violas come in one "full size" the way violins do?
Because a violin’s 4/4 body length (about 14 inches) was standardized well over a century ago and a viola’s never was. A “full size” adult viola is sold anywhere from about 15 to 16.5 inches, occasionally larger, and players genuinely choose within that range as a tone-versus-comfort tradeoff — a bigger body gives a fuller C string at the cost of reach. None of that changes what note C3 or A4 is; it only changes how far your hand has to travel to find it.
Can I tune a cello with this?
A viola and a cello share all four letter names — C–G–D–A — and that is exactly the trap: a cello sits one full octave below, so every target on this page is an octave too high for it. Our dedicated cello tunerhas C2–G2–D3–A3 pre-set, plus the endpin-slip check that has no viola equivalent.