The "HVAC Pipe Sizer - Liquid" application allows you to quickly size a simple pipe system by inputting a number of piping and liquid properties, including hot and chilled water (hydronic).

This app is a universal app that works on both the iPhone and iPad and adjusts its screen size accordingly.

This app now includes the HVAC Equipment Locator. Click here for details:

You can specify the total fluid flow in GPM (or L/s) and one of either unit head loss (ft/100ft), pipe internal diameter (inches) or fluid velocity (ft/s) parameters. The results include both the exact and nominal pipe diameters and the calculated velocity and total head loss. If you are analyzing an existing pipe system, there is an option to input the existing pipe internal diameter and one of either unit head loss or fluid velocity parameters to derive the calculated fluid flow and other remaining properties.

You can specify additional parameters such as the type of liquid, various properties of the liquid, the pipe material type, the total length of pipe, quantities for up to 11 different types of pipe fittings, and much more. You can also choose to display values in either english or metric units.

This application includes built-in pipe fitting equivalent length and nominal pipe sizing tables for a wide variety of pipe material types and diameters.

This application uses slider controls that allow you to quickly increment or decrement the input values and immediately observe the calculated results. You can also manually input exact values.

The app allows you to email inputs and results once you have completed an analysis.

This app now includes the HVAC Equipment Locator. Click here for details:

We also offer the following additional applications for the iPhone/iPad:

1. HVAC Duct Sizer
2. HVAC Pipe Sizer – Gas Low Pressure
3. HVAC Pipe Sizer - Gas High Pressure
4. HVAC Pipe Sizer – Liquid
5. HVAC Pipe Sizer – Steam
6. Steam Tables
7. Psychrometric Plus
8. Psychrometric LT
9. HVAC Pipe Sizer Plus
10. HVAC Pipe Sizer Gas Plus
11. HVAC Toolkit
12. HVAC Toolkit Ultimate
13. HVAC Residential Load Calcs
14. HVAC Load Plus
15. HVAC Equipment Locator
16. ASHRAE Duct Fitting Database
17. ASHRAE 62.1 Ventilation Load Calcs
18. HVAC Psych HD
19. HVAC ResLoad-J
20. HVAC Residential Load Calcs HD

What's New

Version 3.0

1. Optimized for iOS 11
2. Optimized for all iPhone and iPad screen sizes including the new iPhone X
3. Updated UI
4. Updated help

Ratings and Reviews


Wrong calcs!!!

I don't need this app, I bought it to see how actually they built this hvac app, and I have to say it's poor work. This souls be very simple calcs and formulas. I tested the app with copper L pipe, fixed pipe diameter, flow and length, and keep changing fittings which should change the total head loss. Surprise!!!! It's doesn't.
So they got the internal formulas or functions wrong. I will not trust this app calcs to size any system. For people who actually worked on this. Please pay some more attention when you build and sell apps. It's just not about releasing an app, it's something people will pay for and expect to get some trusted result.


Great pressure loss app

With a bit of fiddling, can get some pretty accurate pressure loss calls.
Would love to see an app were you draw out a piping scheme with your finger and put in pipe lengths and typical piping types like grooved connections or welded etc. similar to TACO's desktop software.



Nice little app for the office when I don't feel like booting up my laptop. I wish there were more nominal pipe sizes in the database though. Maybe the next version?


Carmel Software Corporation
18.4 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2018 Carmel Software Corporation. All Rights Reserved.
In-App Purchases
  1. HVAC Equipment Locator $9.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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