Download the calculator

and solve pipe flow problems like a pro

pipe flow calculator

Preferred for Windows™

Latest update 29th April 2024
Required - Windows 64 bit; Internet connection is important to have but not required
Not using Windows 64 bit? click here.
File size 69.1MB

This software is available as a service through the SaaS Terms of Use
Read more about available subscription plans.

Preferred for MacOS™ and Linux™

Start calculator with Java™

If you are having Java on your system, you can try with Java™ Web Start version available from here.
Use the calculator with better user experience and smaller download size (only 2.85MB).

3 steps instruction

to get a calculator and make it work

1. download the calculator by clicking the button above and confirm it is working on your system
2. register account and select credentials
3. select subscription plan from any available. No automatic renewals

Step no. 1 - Download the calculator

Just click the button above and download button on the opened window afterwards, and wait for download to complete, as it can take a while. After that, initiate the installation as for any other application.

After the installation you will be asked to register an account and create username and password.

Step no. 2 - Register your new account

Register your account on registration page. Select a user name, password and enter valid email. You will instantly receive registration confirmation email to confirm your registration and activate account. Click on the link provided in the activation email to activate account. You will once more receive an instant email confirming that your account is activated. This time no action is required from you.

Step no. 3 - Select subscription duration

Subscribe to full service at subscription page. Select one out of two available subscription plans. Each plan is time limited and gives you access to all services on this web site. No automatic renewals.

Professional calculations made easy


  • Everyday problem-solving tool in the field of fluid flow in closed tubes,
  • Seventeen desktop calculators, fourteen calculators as the web application, three calculators for Android smartphones,
  • Solve simple and complex fluid flow problems in less than one minute GUARANTEED,
  • Short learning curve, just enter values and get results,
  • Used every day by thousands of students and professionals,
  • Improved many times and confirmed in practice,
  • All formulas used are available and presented in the theoretical section,
  • Connect with developer using email of social networks,
  • Every reported bug is fixed within a day or two, for years.


  • Change between numerous units of measure from the imperial and metric unit system,
  • Selection of pipes from the list of standard pipes,
  • Selection of fluids from the list of the most common fluids,
  • Selection of pipe material from the list of the most common materials,
  • Store multiple results in a table and export to native Excel file,
  • Copy/paste full calculation report,
  • Export results to native Word and Excel format,
  • Save/open calculation results,
  • Print full calculation report,
  • Continue where you left off,
  • Select between gauge and absolute pressure.

Available calculators

Preview slideshow of all calculators

Pressure drop calculator (1/46)
Pipe diameter calculator (2/46)
Reynolds number calculator (3/46)
Flow in valves and fittings calculator (4/46)
Flow in valves and fittings calculator (5/46)
Air pressure drop calculator (6/46)
Gas pressure drop calculator (7/46)
Gas offtake calculator (8/46)
Natural gas calculator (9/46)
Gas mixture properties (10/46)
LPG calculator (11/46)
Control valve calculator (12/46)
Gas control valve calculator (13/46)
Orifice plate calculator (14/46)
Orifice image (15/46)
Venturi tube calculator (16/46)
Venturi tube image (17/46)
Nozzle calculator (18/46)
Prandtl probe calculator (19/46)
Thermal energy calculator (20/46)
Pipe wall thickness calculator (21/46)
Table for liquids (22/46)
Table for gases (23/46)
Table for water (24/46)
Table for air (25/46)
Table for liquid fuel (26/46)
Table for gas fuel (27/46)
Table for steam (28/46)
Table for custom liquids (29/46)
Table for custom gases (30/46)
Table for pipes ANSI B36-10 (31/46)
Table for pipes ANSI B36-19M (32/46)
Table for pipes API 5L (33/46)
Table for pipes sanitary tubing (34/46)
Table for PVC plastic (35/46)
Table for EN10220 EU tubes (36/46)
Table for PEHD pipes (37/46)
Table for cast iron pipes (38/46)
Table for centrifugally cast pipes (39/46)
Table for concrete pipes (40/46)
Table for copper pipes (41/46)
Table for pit-cast pipes (42/46)
Table for precision tubes (43/46)
Table for pipe surface roughness (44/46)
Help pages (45/46)
Report pages (46/46)