What size cello do I need?

As a general rule, 6-7 years olds need a 1/4 size cello, 8-10 year olds need a 1/2 size, 11-13 year olds need a 3/4 size, and from 14 up a full size cello should be fine. Of course, not everyone the same age is the same height, so it’s worth getting measured up properly before you go out and buy your first instrument. And bow size should match cello size.