Coefficient of Discharge Calculator
Calculate Cᵈ = Qactual / Qtheoretical.
How to Use This Calculator
- Measure actual flow rate through the device.
- Compute theoretical flow from ideal equations.
- Click Calculate to obtain Cᵈ = Qa/Qt.
Formula
Cd = Qa / Qt
Cᵈ accounts for contraction and friction effects, relating ideal to actual discharge.
Frequently Asked Questions
Typical values?
For orifices 0.6–0.65; for Venturi 0.95–0.99, but verify per device.
Units?
Qa and Qt must use the same units; Cᵈ is dimensionless.