Calculating the volume flow of a compressed air hose is relevant to determine what internal diameter a hose should have for a particular application. Often this can be roughly estimated. In some cases, however, an exact calculation is necessary.
The simplest way to calculate the volume flow is to multiply the flow velocity (in m/s) by the flow cross-section (in m^2), i.e. the inner surface of the hose. Alternatively, you can divide the volume of the hose (in m^3) by the time interval (in s).