Guide to Cello Sizes: How to Choose a Cello Size

Manufacturers size cellos according to the length of the instrument’s back. Cellos are available in different sizes to accommodate various heights, arm lengths, and ages of musicians, similar to certain brass and woodwind instruments, like the clarinet or saxophone, and stringed instruments, like the violin or viola. Cello sizing varies by country: Japanese and Romanian cellos are usually slightly smaller instruments than those from the United States. Since there isn’t a “one-size-fits-all” policy for musical instruments, it’s crucial to find the right measurements to help students, especially younger ones, develop the technique needed to play their instruments properly.

There are two cello sizes for adults: the full-size cello, or 4/4 size, which has a back length of 30 inches and above, and the ⅞ size cello, with a back that measures from 27 to 30 inches. There are five smaller cellos from which younger players can choose, ranging from ¾ (26 to 27.25 inches) to ⅒ (17.75 to 20 inches). Cellists must consider their age, height, and arm measurements when choosing the instrument or request a sizing at a retailer that sells cellos.

There are several different ways to choose your ideal cello size, including:

• Age: Age will play a major role in helping you determine the best cello size for your needs. The smallest cello size (⅒) is appropriate for children ages four to six years. For older children, add a year or so to the baseline age for each subsequent size of the cello: the ⅛ cello is appropriate for children ages five to seven, the ¼ for kids ages seven to nine, and so on. Female cellists sometimes use the smaller adult size (⅞), ideal for teenagers 15 years old and up, while the 4/4 works for most adults.
• Arm length: Adults and children alike can use their arm length to determine the best cello size. To make this simple measurement, extend your left arm, so it’s straight with no bends or over-extension. Next, measure from your neck to either your wrist or palm, or from your left shoulder to the tip of the middle finger; a measurement of 24 inches or more would require a 4/4 or full-size cello, while 16 inches or more is acceptable for the ⅒ cello size.
• Finger span: To use the span or distance between your fingers as a cello size guide, spread your fingers in a splayed but comfortable position. A six-inch span from the index finger to the little or “pinky” finger is the right distance for a full-size cello, while three inches is acceptable for the ⅒ cello.
• Height: You can also use your height for an accurate cello measurement. A height of three feet is appropriate for the ⅒, while five feet or taller would require a full-size cello. If you happen to fall between sizes, it’s best to choose a smaller cello.
• Seat: You can get an accurate cello measurement from a seated position if you cannot try the other physical measurements. To use the seat method, sit in a straight-backed chair with your feet on the floor and knees at a 90-degree angle. Set the cello’s endpin to 12 inches in length, and hold the cello as you would if playing it: your sternum, or breast bone, should rest against the upper rim of the cello, and the lower bout corner of the instrument should touch your left knee. The cello’s neck should be close to your left shoulder, while the tuning peg for the C string—the thickest string—should be near your left ear. Your left hand should also be able to use the fingerboard with ease. If this position and height feel comfortable, then the cello is the right size.

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