Orifice Flow Calculator
Calculate fluid discharge using Q = Cd × A × √(2gH)
Calculator
Enter discharge coefficient, orifice area, and head height to compute flow rate through an orifice.
About the Orifice Flow Calculator
The Orifice Flow Calculator helps you quickly determine the volumetric flow rate of a fluid passing through an orifice using the standard hydraulic equation Q = Cd × A × √(2gH). It calculates flow based on discharge coefficient, orifice area, and head pressure. This tool is ideal for civil, mechanical, and hydraulic engineers working with tanks, pipes, and open channel systems.
What You Can Calculate
- Flow Rate (Q): The volumetric discharge through the orifice, measured in m³/s.
- Orifice Area (A): The effective open area through which fluid flows.
- Head (H): The height of fluid above the orifice driving the flow.
- Discharge Coefficient (Cd): A correction factor accounting for energy losses and orifice geometry.
Formulas Used in the Calculator
The calculator uses standard fluid mechanics equations for incompressible flow through sharp-edged orifices:
- Volumetric Flow Rate: Q = Cd × A × √(2gH)
- Acceleration Due to Gravity: g = 9.81 m/s²
- Orifice Area (optional diameter relation): A = πd² / 4
How to Use the Calculator
- Enter the discharge coefficient based on orifice type.
- Enter the orifice area and select the appropriate unit.
- Enter the fluid head height above the orifice.
- The calculator instantly displays the resulting flow rate.
Applications of Orifice Flow Calculation
Orifice flow equations are essential for tank drainage, pipe systems, flow measurement, and hydraulic structure design. Engineers use these calculations to size orifices, predict discharge rates, and analyze fluid behavior under varying head conditions, ensuring safe and efficient hydraulic system performance.