How many contra basses in an orchestra?

Typically, there are 8 to 12 double basses (contrabasses) in a standard symphony orchestra. The exact number can vary depending on the size and composition of the orchestra, as well as the specific requirements of the musical piece being performed. The role of the double bass section is to provide the lowest pitched foundation and harmonic support for the rest of the orchestra, adding depth and richness to the overall sound.