Cellos come in sizes named as fractions, from 1/10 for the smallest children up to 4/4, which is full size. The right size depends on the child’s hand and height, not on age. This page shows how to measure, gives three charts, and explains how to check the fit.
The sizes
From smallest to largest, the common sizes are 1/10, 1/8, 1/4, 1/2, 3/4, and 4/4.
The fractions are names, not measurements. A 1/2 size cello is not half as tall as a full-size one.
How to measure the hand
String shops size a cello by the span of the left hand.
- Have your child hold up the left hand with the fingers spread, as if showing the number five.
- Measure from the tip of the index finger to the tip of the little finger.
Chart 1: by finger span
This chart comes from the sizing guide of Shar Music, a string instrument shop.
| Cello size | Finger span in inches | Finger span in centimeters |
|---|---|---|
| 1/10 | 2.5 to 3 | 6.4 to 7.6 |
| 1/8 | 3 | 7.6 |
| 1/4 | 3 to 4 | 7.6 to 10.2 |
| 1/2 | 4 to 5 | 10.2 to 12.7 |
| 3/4 | 5 to 6 | 12.7 to 15.2 |
| 4/4 | 6 and up | 15.2 and up |
Chart 2: by height
Shar also gives a chart by the player’s height.
| Player’s height | Cello size |
|---|---|
| Under 4 feet (122 cm) | 1/10 or 1/8 |
| 4 feet to 4 feet 6 inches (122 to 137 cm) | 1/4 |
| 4 feet 6 inches to 5 feet (137 to 152 cm) | 1/2 |
| 5 feet to 5 feet 4 inches (152 to 163 cm) | 3/4 |
| 5 feet 4 inches and taller (163 cm and up) | 4/4 |
Chart 3: by age
Age is the weakest guide, since children of one age differ so much. This chart is from the music store Sweetwater.
| Age | Cello size |
|---|---|
| 4 to 6 | 1/8 |
| 6 to 7 | 1/4 |
| 7 to 11 | 1/2 |
| 11 to 15 | 3/4 |
| 15 and older | 4/4 |
The three charts do not always agree. Use them to pick a size to try first. Then check the fit with the cello in your child’s hands.
The fit check in a chair
Sit your child on a chair with both feet flat on the floor. Set the cello in playing position.
A good fit. The knees rest on either side of the lower part of the cello’s body. The left hand reaches the fingerboard with a relaxed elbow.
Too big. The child has to reach up or stretch to get the left hand in place.
Too small. The child hunches over the cello.
The chair matters too. Use one that lets both feet rest flat on the floor.
When in doubt, go smaller
Shops and teachers give the same advice for a child between two sizes: choose the smaller one. A cello that is too big can hurt posture and technique. Do not buy a size “to grow into.”
When to move up
Children grow at different rates. Sweetwater suggests a move to the next size about every second year. A growth spurt can make it sooner.
Signs that it is time:
- The left hand looks cramped on the fingerboard.
- The child hunches to reach the cello.
- The teacher says so. Ask the teacher to check the fit every few months.
The bow has a size too
Each cello size has a matching bow. Sweetwater notes that the size of the bow matters as much as the size of the instrument. In a rental outfit, the bow matches the cello.
Rent or buy?
A child who starts young may go through several sizes. Renting the small sizes is one way to manage the cost. Ask the shop two questions.
- Can we trade up to the next size at no charge?
- Does part of the rent count toward buying a cello later?
Related pages
- Cello for kids: how it works and what to hear
- Suzuki cello for kids: how it works
- Suzuki cello Book 1 songs in order
- Violin sizes for kids: how to measure and choose
- Viola sizes for kids: how to measure and choose
- String instruments for kids: violin, viola, cello, and bass
Sources
Checked in November 2026.
- Shar Music. The complete string instrument sizing guide.
- Shar Music. How to find the right size instrument for your child or student.
- Shar Music. How to choose your first instrument, for the finger span chart.
- Shar Music. Understanding instrument sizes: a parent’s guide to choosing the right fit, for the height chart.
- Sweetwater. What size string instrument do you need?
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Use it with your kids
Print a listening page, a practice chart, or a composer fact sheet. Or try a tool, such as the composer timeline or the piece picker.