Some common values for Cd are shown on the right as an aide. Use your value that is appropriate for your orifice.
Select units from choices available and enter a value for that unit. The program allows mixed units and will convert, where needed, to the units for your answer Be careful of the units and values entered.
A derivation of the Orifice Equation is found here.
Here are three forms of the orifice equation. Choose the form you need.
Error MessageΧ
This form is for Flow. Click on the button below to choose another form.
(Flow),Q = A C d √ 2 ∆ P / ρ
This form is for Area and Diameter. Click on the button below to choose another form.
(Orifice Area and Diameter),A = Q / C d √ 2 ∆ P / ρ
This form is for Pressure Drop. Click on the button below to choose another form.