CALCULATE WITH CONFIDENCE

Engineering · Fluid Systems & Hydraulics

Orifice Discharge and Pressure Drop Calculator

Calculate idealized liquid flow through an orifice from entered pressure drop or reverse-solve pressure drop from entered flow.

Engineering · Fluid Systems & Hydraulics

Enter the engineering model

Explicit properties, geometry, units and assumptions
  1. 1EnterProvide the known values
  2. 2CalculateResults update automatically
  3. 3VerifyReview the details and units
Try an example
Visual modelSchematic · not to scale
Fluid Systems & Hydraulics: flowFromDp visual explanationA simplified diagram showing the relationship represented by the selected calculator mode. It is explanatory and not a fabrication, safety or scale drawing.entered Cd links pressure drop and floworifice area comes from entered diameter
The diagram explains the selected relationship only. Dimensions, symbols and proportions are illustrative; use the entered values and stated assumptions for the calculation.

Keep every unit basis, sign convention, property source and idealization consistent. Values stay in this browser.

Engineering calculation result

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Enter valid values to see the result.

Your entries are calculated in this browser and are not submitted to 365CALCS.COM.

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Understand the fluid model

What this calculator is for

Calculate idealized liquid flow through an orifice from entered pressure drop or reverse-solve pressure drop from entered flow. It turns a fluid-system relationship into an auditable workflow without hiding the chosen coefficient, state, efficiency or boundary.

1Choose the solve direction and identify the physical control volume or component.
2Enter all pressures, flows, heads and dimensions in one consistent unit system.
3Check the reconciliation outputs and model boundary before using the result.

Visual explanation

The schematic highlights the entered states and the direction of flow, pressure, energy or volume change so the equation can be checked against the actual system.

The governing relationship

Q=CdA√(2Δp/ρ); reverse Δp=ρ(Q/(CdA))²/2.

Keep the boundary visible

Steady incompressible single-orifice relation only. Taps, beta ratio, expansibility, cavitation, viscosity and standard metering corrections are excluded.

Quick guide

How to use this calculator

  1. Choose the analysis mode that matches the physical model before entering values.
  2. Enter properties, geometry, loads, states and coefficients from one consistent unit and sign convention.
  3. Use the intermediate outputs to audit the relationship, then retain the stated idealization before applying it.

Calculation method

Transparent engineering model

Q=CdA√(2Δp/ρ); reverse Δp=ρ(Q/(CdA))²/2.

The calculator evaluates only the declared relationship and preserves visitor-entered assumptions rather than selecting materials, factors, components or standards.

Worked example

Worked example

The discharge coefficient stays explicit so geometry and calibration are never hidden.

Q=CdA√(2Δp/ρ); reverse Δp=ρ(Q/(CdA))²/2.

Supported inputs

Precision and limits

Analysis, not approval

Steady incompressible single-orifice relation only. Taps, beta ratio, expansibility, cavitation, viscosity and standard metering corrections are excluded.

Standards and properties

Material properties, allowable values, load combinations, safety factors, correlations, manufacturer data, codes and jurisdictional requirements are not supplied automatically.

Units and precision

Use one consistent unit basis. Results retain working precision but cannot be more accurate than the entered measurements and properties.

Privacy

Entered engineering values and results stay in this browser and are not sent to analytics or third parties.