Comparison

HVAC Pipe Sizer Plus vs Fluid Mechanics Calculator

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

HVAC Pipe Sizer Plus

This utility app combines three specialized pipe sizing tools for HVAC systems: liquid, steam, and gas. It offers flexible input options, unit conversions, and an equipment locator for comprehensive HVAC design.

Highlights
  • Liquid pipe sizing
  • Steam pipe sizing with steam table calculator
  • Gas pipe sizing (low and high pressure)
  • HVAC Equipment Locator
  • Slider controls for input adjustments
  • English and Metric unit display
Features
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The HVAC Pipe Sizer Plus application is a combination of three (3) of our individual pipe sizing applications including: 1. HVAC Pipe Sizer - Liquid 2. HVAC Pipe Sizer - Steam 3. HVAC Pipe Sizer - Gas Plus This app is a universal app that works on both the iPhone and iPad and adjusts its screen size accordingly. The "HVAC Pipe Sizer - Gas" module allows you to quickly size a simple low (less than or equal to 1.5 psi) and high (greater than 1.5 psi) pressure gas piping system by inputting a number of piping and gas properties. The "HVAC Pipe Sizer - Steam" module allows you to size a steam pipe run, and it also includes a bonus steam table calculator. The "HVAC Pipe Sizer - Liquid" module allows you to size a pipe run with many different types of liquids (or fluids), pipe material and fitting types. This application includes all of the great features of the individual pipe sizer apps such as the use of slider controls that allow you to quickly increment or decrement the input values and immediately observe the calculated results. It also allows you to specify different types of liquids, gases, pipe material types, fitting quantities, min and max ranges, and step values. Also, you can display a wide variety of English and Metric units. The "HVAC Pipe Sizer Plus" application was designed by Carmel Software Corporation, a leader in HVAC design software since 1995. In fact, Autodesk (the makers of AutoCAD) acquired our load calculation software and incorporated it into their leading 3D modeling software called Revit. In addition, we developed a number of customized apps for ASHRAE, DNV GL, and other organizations. We also offer the following additional apps for the iPhone and iPad: 1. HVAC Residential Load Calcs for iPhone and iPad 2. HVAC Quick Load Plus 3. HVAC Quick Load 4. HVAC Toolkit 5. HVAC Pipe Sizer – Gas Low Pressure 6. HVAC Pipe Sizer - Gas High Pressure 7. HVAC Pipe Sizer – Liquid 8. HVAC Pipe Sizer – Steam 9. Steam Tables 10. Psychrometric Plus 11. Psychrometric LT 12. HVAC Pipe Sizer Plus 13. HVAC Pipe Sizer Gas Plus 14. HVAC Toolkit Ultimate 15. HVAC Equipment Locator 16. HVAC ResLoad-J 17. HVAC Psych HD

About

Fluid Mechanics Calculator

This app provides 97 calculators for fluid mechanics and civil engineering parameters. It supports both Imperial (USCS) and Metric (SI) units, offering automatic and accurate calculations with unit changes.

Highlights
  • 97 fluid mechanics and civil engineering calculators
  • Supports SI and USCS (Imperial) units
  • Automatic calculations with unit changes
  • Wide range of parameters covered
  • Civil engineering applications
Features
Read full description

Fluid Mechanics Calculator contains 97 calculators to compute different Fluid Mechanics and Civil Engineering parameters — now with a solve-for-any-variable engine: in every calculator, choose the value you want to find and enter the rest. Available in both USCS (Imperial Units) and SI (Metric Units). What's new in this version: • Filter calculators by category — pressure, open channel, pipe, groundwater, pump, and dimensionless numbers • Solve for any variable — pick the unknown in each calculator; no more fixed inputs and outputs • Share any calculation as an image Features: • 97 Fluid Mechanics and Civil Engineering calculators • Automatic, instant results on every value and unit change • USCS (Imperial) and SI (Metric) units throughout • Clear formulas and definitions for every calculator Calculator List: Absolute Pressure Brake Horsepower Bernoulli Theorem for Head Loss Bulk Modulus Buoyant Force Chezy Coefficient Chezy Velocity Compressibility External Hydrostatic Pressure Flow Rate Fluid Density with Pressure Fluid Pressure Hydraulic Radius Kinematic Viscosity Liquid Phase Diffusion Coefficient Pump Efficiency Manning Flow Velocity Mean Depth Minor Losses Net Positive Suction Head and Cavitation Specific Gas Constant Specific Gravity with Water Weight Specific Gravity with Water Weight Loss Specific Volume Thrust Block Water Horsepower Acoustic Flow Meter Bazin's Weir Flow Broad Crested Weir Curb Capture Flow Rate Curb Gutter Flow Rate French Drain Seepage Rate Gutter Capture Efficiency Gutter Carryover Gutter Interception Capacity Rectangular Weir Rectangular Weir Discharge - Francis Equation Orifice Flow Rate Parshall Flume Flow Rate Permeameter Porous Medium Flow Rate Unconfined Aquifer Well Flow Rate V notch Weir Venturi Meter for Flow Rate Hazen Williams - Fluid Flow Rate Hazen Williams - Mean Fluid Velocity Aluminum Pipe - Pressure Rating Buried Corrugated Metal Pipe Thrust - Cross Sectional Area Buried Corrugated Metal Pipe Thrust - Pipe Wall Buried Corrugated Metal Pipe Thrust - Pressure Ductile Iron Pipe - Pressure Ductile Iron Pipe - Wall Thickness Pipe Vacuum Pressure Load Pipe Water Buoyancy Factor Plastic Pipe - AWWA C900 Pressure Class Plastic Pipe - Inside Diameter Controlled Plastic Pipe - Outside Diameter Controlled Plastic Pipe - Outside Diameter Controlled Short Term Strength Plastic Pipe - Short Term Pressure Rating Slotted Pipe Gutter Interception Smooth Wall Steel Pipe - Pressure Rating Soil Load Per Linear Length of Pipe Restrained Anchored Pipe Stress Pipe Soil Weight Pressure Unrestrained Pipe Length Change Poiseuille's Law Stokes Law Cauchy Number Cavitation Number Eckert Number Euler Number Fourier Number Froude Number Knudsen Number Lewis Number Mach Number Prandtl Number Reynolds Number Schmidt Number Sherwood Number Nusselt Number Peclet Number Strouhal Number Threshold Odor Number Weber Number Darcy Weisbach - Head Loss Darcy's Law - Flow Rate Darcy's Law - Flux Darcy's Law - Hydraulic Gradient Darcy's Law - Porosity Darcy's Law - Saturated Soil Darcy's Law - Seepage Velocity Darcy's Law - Seepage Velocity and Porosity Darcy's Law - Void Ratio Water Hammer - Maximum Surge Pressure for a Fluid Water Hammer - Maximum Surge Pressure for Water Water Hammer - Maximum Surge Pressure Head Water Hammer - Pressure Increase

Screenshots

HVAC Pipe Sizer Plus4 screens
Fluid Mechanics Calculator4 screens

Verdict

The call

The clearest difference is review sentiment: HVAC Pipe Sizer Plus at 67% against Fluid Mechanics Calculator's 0%. Fluid Mechanics Calculator's advantage is price ($2.99 vs $13.99) and rating (4.5 vs 3.0). On ads, in-app purchases, monetization model and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

HVAC Pipe Sizer Plus costs $13.99 and Fluid Mechanics Calculator $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Fluid Mechanics Calculator holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: Fluid Mechanics Calculator has 21 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 67% of HVAC Pipe Sizer Plus's written reviews are positive against 0% of Fluid Mechanics Calculator's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

HVAC Pipe Sizer Plus ships an update every 15 months, Fluid Mechanics Calculator every 7 months. Both last shipped on November 6, 2026.

Scorecard5 real differences · 5 level
HVAC Pipe Sizer Plus versus Fluid Mechanics Calculator: the parameters behind the verdict, then further details
ParameterHVAC Pipe Sizer PlusFluid Mechanics Calculator
Price$13.99$2.99 — better
Rating3.0 (1 ratings)4.5 (21 ratings) — better
Positive reviews66.7% of reviews — better0.0% of reviews
Number of ratings121 — better
Update frequencyEvery 15 monthsEvery 7 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.016.1 — better
Further details — not scored
Size2 MB11 MB
Age rating+44+
DeveloperCarmel Software CorporationV PUGAZHENTHI

Customer experience

HVAC Pipe Sizer Plus

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral33.3%
Negative0.0%

Fluid Mechanics Calculator

All ratings21 ratings
Positive85.7%
Neutral9.5%
Negative4.8%
Written reviews3 reviews
Positive0.0%
Neutral33.3%
Negative66.7%

In-app purchases

None

HVAC Pipe Sizer Plus

No in-app purchases

None

Fluid Mechanics Calculator

No in-app purchases

Questions

Is HVAC Pipe Sizer Plus free?
HVAC Pipe Sizer Plus costs $13.99, with no in-app purchases.
Is Fluid Mechanics Calculator free?
Fluid Mechanics Calculator costs $2.99, with no in-app purchases.
Which has better reviews, HVAC Pipe Sizer Plus or Fluid Mechanics Calculator?
Fluid Mechanics Calculator is rated higher. HVAC Pipe Sizer Plus averages 3.0 out of 5 from 1 ratings, while Fluid Mechanics Calculator averages 4.5 from 21 ratings.
Do HVAC Pipe Sizer Plus or Fluid Mechanics Calculator have ads?
Neither HVAC Pipe Sizer Plus nor Fluid Mechanics Calculator shows ads.
Which is updated more often, HVAC Pipe Sizer Plus or Fluid Mechanics Calculator?
HVAC Pipe Sizer Plus ships an update every 15 months, and Fluid Mechanics Calculator every 7 months. Most recently, HVAC Pipe Sizer Plus was updated on November 6, 2026 and Fluid Mechanics Calculator on November 6, 2026.

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