Orifice Flow Calculator

Your details

Internal diameter of the orifice opening.
m
Vertical distance from the free surface of the liquid to the center of the orifice.
m
Accounts for friction and contraction losses at the orifice. Typical values: 0.60-0.65 for sharp-edged orifices, 0.80-0.85 for rounded, 0.98-0.99 for well-designed nozzles.
Standard value is 9.81 m/s² (metric) or 32.174 ft/s² (imperial). Adjust for other planets or precision work.
m/s²
Volumetric flow rate (Q)Low flow
0.007503m³/s

Volume of fluid passing through the orifice per second.

Orifice area (A)0.001963m²
Theoretical velocity (v)6.2642m/s
Actual velocity (Cd × v)3.8212m/s
Flow rate450.169L/min
Theoretical velocity (m/s)6.2642
Actual velocity (m/s)3.8212

Orifice flow: 0.007503 m³/s (450.2 L/min)

  • The volumetric flow rate through the orifice is 0.007503 m³/s (450.2 L/min).
  • The theoretical (Torricelli) velocity is 6.264 m/s; the actual velocity after discharge-coefficient losses is 3.821 m/s.
  • A Cd of 0.60-0.65 is typical for a thin, sharp-edged orifice plate in turbulent pipe flow.

Next stepCross-check your Cd against the manufacturer's data sheet or the ISO 5167 table for your orifice type and Reynolds number range.

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