Flow Through Orifice Calculator

This tool calculates the flow of incompressible fluid through an orifice in a horizontal pipe.




Type the required values to get the flow through an orifice:

Inlet Pressure (P1, Pa)


Outlet Pressure (P2, Pa)


Pipe Diameter (D1, m)


Orifice Diameter (Do, m)


Discharge Coefficient (Cd) [See the above table for typical values]


Fluid Density (kg/m3)




Discharge Volumetric Flow (m3/s)