Can this calculator handle non-water liquids?

Yes, you can input custom values for liquid density and viscosity to model oils, fuels, or other fluids, though the results remain estimates based on the orifice flow equation.

What is the coefficient of discharge and do I need to know it?

The coefficient of discharge (Cd) accounts for real-world flow losses; the tool provides a default value, but you can adjust it if you have measured data for your specific orifice.

Does the tool support metric and imperial units?

The interface accepts standard unit inputs for diameter, pressure, and head, allowing you to work in either system depending on your preference.

Is the calculated flow rate exact for my tank setup?

No, the result is an estimate based on ideal fluid dynamics; actual discharge may vary due to pipe geometry, fluid turbulence, or orifice edge conditions not captured by the calculator.

PhysicsFree Tool

Orifice Flow Calculator

Provided byOmni Calculatoromnicalculator.com

Determine the flow rate of liquid through an orifice using the orifice flow calculator.

Use This Tool

Fluid mechanics calculators

Screenshot of Orifice Flow Calculator on Omni Calculator — omnicalculator.comOpen the live tool →

About this tool

What Orifice Flow Calculator does

The Orifice Flow Calculator determines the volumetric flow rate of liquid exiting an opening under specific physical conditions. Users input parameters such as orifice diameter, pressure difference, and liquid properties to receive a calculated discharge value. The tool applies fundamental fluid dynamics principles to model scenarios involving constricted passages or nozzles, providing an accurate measure of liquid discharge speed for scientific analysis or engineering design. It serves as a practical resource for anyone needing to quantify flow through an orifice without manual computation. The Omni Calculator version distinguishes itself through a clean, step-by-step interface that guides users through each input field with plain-language explanations. Unlike more technical software, it offers real-time result updates, example scenarios for water and oil tanks, and the ability to share or reload calculations instantly. The site also links to 49 related fluid mechanics calculators, creating a broader ecosystem for related tasks while keeping this tool focused and uncluttered.

Step by step

How to use the Omni Calculator Orifice Flow Calculator

1
Enter the diameter of the orifice in the designated field
2
Input the pressure difference or head across the orifice
3
Specify the liquid properties such as density and viscosity
4
Adjust the coefficient of discharge if known, or use the default value
5
View the calculated flow rate (Q) displayed instantly as output

Is it right for you

Best for

Engineers, physics students, and industrial technicians who need quick, accurate flow rate calculations for orifice applications without manual formula manipulation.

Limitations

Results are estimates based on ideal fluid assumptions
Requires known input values; not suitable for unknown or complex multiphase flows
Default coefficient of discharge may not match every real-world orifice geometry

Questions

Orifice Flow Calculator FAQ

Can this calculator handle non-water liquids?: Yes, you can input custom values for liquid density and viscosity to model oils, fuels, or other fluids, though the results remain estimates based on the orifice flow equation.
What is the coefficient of discharge and do I need to know it?: The coefficient of discharge (Cd) accounts for real-world flow losses; the tool provides a default value, but you can adjust it if you have measured data for your specific orifice.
Does the tool support metric and imperial units?: The interface accepts standard unit inputs for diameter, pressure, and head, allowing you to work in either system depending on your preference.
Is the calculated flow rate exact for my tank setup?: No, the result is an estimate based on ideal fluid dynamics; actual discharge may vary due to pipe geometry, fluid turbulence, or orifice edge conditions not captured by the calculator.

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