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Orifice Flow Rate Calculator — result sheet
Estimate volumetric flow through a sharp-edged orifice from discharge coefficient, area, pressure difference, and fluid density.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Q = Cd A √(2ΔP/ρ); average orifice velocity = Q/A.
The ideal pressure-to-speed relationship is scaled by a user-supplied discharge coefficient to represent contraction and losses in a narrow screening model.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Discharge coefficient — minimum 1.0E-6; maximum 1
- Orifice area — m²; minimum 1.0E-6; maximum 1000000
- Pressure difference — Pa; minimum 0; maximum 1000000000000
- Fluid density — kg/m³; minimum 1.0E-6; maximum 1000000
Worked example
| Input | Value |
|---|---|
| Discharge coefficient | 0.62 |
| Orifice area | 0.001 |
| Pressure difference | 10000 |
| Fluid density | 1000 |
Estimated flow is about 0.00277 m³/s, or 166.4 L/min.
Assumptions and limits
- The fluid is incompressible, the pressure difference is positive or zero, and the density is constant.
- The discharge coefficient represents the selected geometry and flow regime and is not inferred from the inputs.
- Upstream and downstream piping, cavitation, compressibility, Reynolds-number effects, and code-approved meter calibration are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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