Orifice Flow Rate Calculator
SI
Imp
Imperial
Inputs
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Orifice diameter
(d)
Actual orifice bore diameter.
mm
Pressure drop
(dp)
Pressure difference across the orifice.
bar
Discharge coefficient
(Cd)
Accounts for contraction and losses. Sharp-edged liquid orifices are often near 0.60-0.65.
Fluid density
(rho)
Density at operating temperature.
kg/m³
Results
Default result
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Orifice flow rate
(Q)
41.36
L/min
Q = Cd x A x sqrt(2dp/rho).
Also computed
Effective jet velocity
(Cd*v_ideal)
8.777
m/s
Ideal velocity
(sqrt(2dp/rho))
14.16
m/s
Orifice area
(A)
78.54
mm²
Mass flow
(m_dot)
0.688
kg/s
Method notes
2 notes
Liquid orifice flow uses Q = Cd*A*sqrt(2*dp/rho). Cd must match the orifice geometry and Reynolds-number range.
This incompressible screen is not for choked gas flow, two-phase flow, cavitating restrictions, control-valve sizing or calibrated custody-transfer metering.
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