The Short Answer
A standard violin has four strings. They are tuned in perfect fifths: G3, D4, A4, E5. That is it. If you buy a violin from any major manufacturer and open the case, that is what you will find. No exceptions in the standard instrument family. But the question of how many strings on a violin becomes more complicated when you start looking at specialized instruments and historical setups. I ran into this myself a while back when a student brought in a 5-string violin for a repair consultation. The luthier had fitted it with an extra low C string, which meant the neck was wider and the fingerboard was carved differently than a standard setup. Not something you can just swap onto a regular violin without modifying the instrument.
How Many Strings On A Violin
The answer depends on what kind of violin we are talking about. Here is the breakdown of what actually exists in the field. This is the instrument you see in orchestras, chamber groups, and music classrooms. Four strings, tuned G-D-A-E. The G string is the thickest and produces the lowest pitch. The E string is the thinnest and carries the highest register. Each string is typically made from either synthetic core, steel, or gut. Synthetic core is the most common choice for serious students and professionals these days because they stay in tune better than gut and sound warmer than steel. I have seen players go through sets of strings anywhere from three months to two years depending on how much they play. A student practicing an hour a day might re-string every six to eight months. A professional performing regularly might change them every three to four months. The strings lose their brightness and the intonation drifts. You can tell when they are worn out because the tone goes dull and the E string starts to sound metallic and harsh.
Five-String Violin
Five-string violins exist and they add either a low C string below the G or a high B string above the E. The low C extension is far more common, especially among folk and jazz violinists who need a broader range without switching to viola. These instruments have a wider neck and a longer fingerboard. The additional string requires a different bridge cut as well, since the bridge needs a groove for five strings instead of four. The problem with five-string violins is that they are not interchangeable with standard repertoire. Most classical sheet music is written for four strings. If you pick up a five-string and try to play standard Bach Partitas, you will find yourself constantly wondering whether to play the passage on the G string or the new C string, and the notation does not tell you. I worked with a player who tried to use a five-string for orchestral auditions and ended up spending extra time transcribing parts just to make them comfortable. It added about twenty minutes of prep per piece and still did not feel natural under pressure.
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Six-String and Specialty Violins
Six-string violins are extremely rare. They typically appear in experimental or crossover contexts where the player wants the range of both violin and viola simultaneously. I have only encountered two in my time, and both were custom orders. The fingerings become a spatial puzzle pretty quickly because your hand has to cover more ground and the string spacing changes across the neck. There are also violins with tenor and bass ranges built for specific folk traditions, like the Norwegian Hardanger fiddle, which has four main playing strings and four or five sympathetic resonance strings underneath. The sympathetic strings are not played directly but vibrate in response to the bowed strings, giving that characteristic buzzing, shimmering sound. The Hardanger fiddle typically has eight total strings — four played, four sympathetic — though some variants go up to nine or ten.
Electric Violins
Electric violins follow the same basic string count as their acoustic counterparts, but the construction is different enough that the string options vary. Some electric models come with five or even seven strings. A seven-string electric violin adds both a low B and a high F, essentially giving you the range of a violin plus a little extra on each end. The scale length and string tension behave differently because the body is usually a solid block rather than a resonant chamber, which affects how the strings feel under the bow. I once had a guitarist try to transfer his approach to an electric violin with seven strings and kept playing chords that were physically impossible on that instrument. The string spacing just does not allow for the same voicings you can get on a guitar. He spent about three weeks adjusting his technique before it stopped sounding forced.
Violin vs. Viola String Count
A common point of confusion is the relationship between violin and viola. The viola also has four strings, but they are tuned a perfect fifth lower than the violin: C3, G3, D4, A4. The C on the viola matches the G on the violin in pitch, which is why viola music is written in alto clef — it keeps the staff lines from multiplying. Someone switching from violin to viola does not need to learn a new string count. They need to learn that their old G string is now the middle string on a larger instrument, and the bow holds differently because the strings are thicker and the instrument rests on the chest rather than the shoulder.

Practical Notes on String Setup
If you are working with a standard four-string violin and trying to understand the setup, here is what matters. The strings pass over the bridge and are anchored at the tailpiece. The tension on all four strings combined is roughly forty to forty-five pounds. That is a significant amount of force pulling upward on the soundpost and the top plate, which is why a broken string can sometimes cause the soundpost to fall inside the instrument. If you change a string and hear a rattling sound, check the soundpost position before you assume the rattle is coming from somewhere else. String gauge matters too. Light gauge strings respond faster and are easier to press down, which is why most beginners start with them. Heavy gauge strings produce a fuller tone but require more finger strength and bow pressure. Medium is the middle ground and is what most intermediate players settle on. I would not recommend going heavy on a student instrument because the poor quality of the wood and varnish will not benefit from the extra tension — it will just make the instrument sound worse with more effort required.
When the String Count Changes Mid-Performance
There is a niche situation worth mentioning. Some contemporary composers write pieces that call for a player to retune a string mid-performance, sometimes called scordatura. The most famous example is Bartok, who tuned the A string down to Gin several works. This is not changing the number of strings, but it does change the tuning enough that fingerings you learned for standard tuning no longer apply. A player who has not practiced the specific scordatura fingering will make consistent mistakes in the first few bars, and it takes real muscle memory adjustment to recover. I watched a performer attempt a scordatura piece cold at a workshop and miss nearly every note in the first movement because his hand was still positioning for standard tuning. He recovered after about four minutes, but it was clear he needed at least a week of dedicated practice on the alternate tuning before it would feel normal.
Summary
Four strings is the standard. Five exists as a specialty option. Six and seven are rare and mostly found on electric instruments. Historical and folk variants like the Hardanger fiddle add sympathetic strings that you do not bow directly. The core answer to how many strings on a violin remains four, but the variations exist for reasons that are practical rather than decorative.
