The length of a standard B-flat trumpet is about 19.5 inches with a variance of no greater than a half inch. The total length of the tubing, were it to be extended, is approximately 54 inches. It is bent into curves to accommodate all the extra length.
There are less common styles of trumpet such as the piccolo trumpet, which measures about 10 inches in length, and the triumphal trumpet, which measures 52 inches. The size of the bore and the size of the bell of a trumpet also are likely to vary and to contribute to the sound produced by an individual trumpet.