Orifice Flow Calculator
Find flow through an orifice under a head of fluid.
Find the flow of liquid escaping through a small opening under gravity.
The math behind it
Q = Cd·A·√(2gh) (Torricelli's law with a discharge coefficient ~0.62 for a sharp orifice).
Worked example
Cd 0.62, A 0.001 m², head 2 m → about 0.00388 m³/s.
FAQ
Why √h?
Exit velocity is √(2gh), so flow scales with the square root of head.