pipeflowcalculations.com on facebook

Nozzle and Venturi nozzle calculator

Related calculators: Venturi flow; Orifice flow

Pipe flow calculator features

  • Pack of sixteen pipe flow calculators in one application
  • Productive tool for every day flow calculations
  • Used by thousands of engineers, students, professors and other professionals every day
  • Multiple calculation scenarios for each calculator
  • Easy switch between metric and imperial units
  • Copy and save calculation results
  • Every calculator is backed with used theory and equations
  • Always use the latest version with automatic update
  • Stay connected with developer and community through social channels



Java Runtime Environment – JRE version 1.8+
(install latest JRE now)

OR without Java
Download and run calculators pack - for Windows64bit users only.

Register and activate account on pipeflowcalculations.net

Select subscription plan

Read detailed instructions and requirements

Calculators for download in one pack, Java required.
For desktop/laptop users (Windows, MacOS, Linux)

download and start
*no administrator's roles required

No Java? It's a shame…
BUT it's not the end of the word!

If you are having Windows 64bit on your computer you can download and run calculators even without administrator role on your computer. This kind of calculator deployment is great if you are on the corporate network and if you don't have authority to install anything on your computer.

If you are not Windows 64bit user you can still use some calculators on my other web site at pipeflowcalculations.net .
There you can try server side, mobile friendly, pipe flow calculators that require nothing more than a web browser and Internet connection

Nozzles and Venturi nozzles are devices that are inserted in circular cross-section conduit to create pressure difference of static pressure. Based on that pressure difference, flow rate of flowing fluid can be calculated.

Three types of nozzles are covered in calculator: ISA 1932 nozzle, long radius nozzle and Venturi nozzle. All three types differ from each other based on its shape. All nozzles have radius shaped convergent inlet with cylindrical throat and Venturi nozzle also has divergent part as outlet.

Nozzle and Venturi nozzle calculator can be used for both liquids and gases. Calculator is applicable for subsonic flow and single phase fluid. Gas is considered as compressible and ideal. For gas flow, pressure ratio p2/p1 must be equal or greater than 0.75. Calculator is not for pulsating flow.

Calculation of gas flow with higher pressure drop and flow close or equal to choked flow conditions gas discharge calculator should be used.

Limits of use for nozzles are:

  • 50 mm < D < 500 mm
  • 0.3 < β < 0.8
  • 7x104 < ReD < 107 for 0.3 < β < 0.44
  • 2x104 < ReD < 107 for 0.44 < β < 0.80

Limits of use for long radius nozzles are:

  • 50 mm < D < 630 mm
  • 0.2 < β < 0.8
  • 104 < ReD < 107

Limits of use for Venturi nozzles are:

  • 65 mm < D < 500 mm
  • 0.316 < β < 0.775
  • 1.5x105 < ReD < 2x106

Flow rate through nozzles in calculator is calculated using:

rate through nozzles and orifices

where is:

  • q - flow rate
  • C - flow coefficient
  • A - cross section area
  • Δ p - pressure drop
  • ρ - density
  • gn - acceleration of gravity
  • hL - head loss

The values of hL and Δ p are measured differential static head or pressure before and after the nozzle. Values for coefficient of discharge or flow coefficient (C or Cd) can be calculated based on applicable standards like ISO 5167 or similar ASME standards.

Can't see the calculator? Click here to find out why.