# HVAC Formulator — For HVAC Professionals

> HVAC formulas, calculations, and unit conversions for professionals. (iPhone/iPad app by Historycentral.com.)

- Source: https://appshunter.io/ios/app/hvac-formulator/id318898907 (this page in markdown: same URL + `.md`)
- Developer: [Historycentral.com](https://appshunter.io/developer/1744330560)
- Category: Productivity, Business
- Price: $4.99 with in-app purchases
- Rating: 2.00/5 from 1 App Store ratings · 11 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.6 · 73 MB
- Languages: American English
- Released: 2009-06-09
- Data updated: 2026-08-23
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/hvac-formulator/id318898907/reviews.md

## What is HVAC Formulator?

HVAC FORMULATOR is the essential tool for Heating, Ventilating, and Air
  Conditioning professionals. With over 900 formulas and calculations, it covers
   everything from basic load calculations to advanced system design — all in
  your pocket.

  US & METRIC SUPPORT — Switch instantly between US (Imperial) and Metric (SI)
  units. Results display in both systems so you always have the value you need.
  Input labels and conversions update automatically.

  23 CALCULATOR CATEGORIES including:
  - Cooling Load — Sensible, latent, and total cooling calculations, tons, EER,
  COP, and sensible heat ratio
  - Fan Laws — Speed and diameter affinity laws for CFM, pressure, and
  horsepower
  - Duct Sizing — Velocity, round and rectangular sizing, equivalent diameter,
  aspect ratio
  - Ventilation Rate — ASHRAE 62.1 breathing zone, air changes per hour, exhaust
   fan sizing
  - Electrical — Ohm's Law, single and three-phase power, motor FLA, watts to
  BTU/h
  - Gas Laws — Boyle's, Charles's, Gay-Lussac's, Combined, and Ideal Gas Law
  - Psychrometrics — Bypass factor, mixed air temperature, percent outside air,
  dew point
  - Hydronic Formulas — Heat transfer, flow rate, pipe velocity, expansion tank,
   Cv coefficient
  - Boiler — Efficiency calculations, BTU output, heat absorption
  - Refrigeration — Tonnage output, compression ratio, mass flow rate, COP
  - Ductwork — Velocity, velocity pressure, total pressure, equivalent round
  - Airside — Sensible heat, latent heat, total heat (US and Metric)
  - Piping — Pipe area, weight, friction loss, expansion, Hazen-Williams, 70+
  formulas
  - Steam — Condensate loads, fuel calculations, steam flow
  - Pump Laws — Break horsepower, suction head, pump affinity laws
  - Energy — Fuel values for oil, gas, coal, propane, ethanol, and more
  - Heating Design — Electric heating, baseboard, radiant ceiling, boiler
  capacity, hydronic snow melting
  - Heating Requirement — Insulation-based load calculations
  - Humidity — Specific humidity, relative humidity, sensible and latent heat
  - Loads — Temperature loads, heat gains from lights, equipment, and machines
  - Temperature — Mixed air, liquid mixing, final temperature calculations
  - Waterside System — Total heat, evaporator and condenser flow rates
  - Air Change Rate — Air changes per hour, air flow rate

  460+ UNIT CONVERSIONS across 16 categories: Metric, Pressures, BTU, Linear,
  Square, Cubic, Liquid Measures, Weights, Flows, Power, Horsepower, Watts,
  Hydraulic, Ft-Lbs, Sand/Volume, and HVAC-specific conversions.

  8 TEMPERATURE SCALES — Convert between Celsius, Fahrenheit, Kelvin, Rankine,
  Reaumur, Newton, Delisle, and Romer.

  BUILT FOR PROFESSIONALS:
  - Search across all 900+ formulas instantly
  - Mark favorites for quick access
  - Save calculation history with full breakdown
  - Share and export results
  - Clean, fast interface designed for field use
  - Works offline — no internet required

  HVAC FORMULATOR is a professional-grade tool built for HVAC technicians,
  engineers, contractors, and students. New formulas and features are added
  regularly.

## Key features

- Over 900 formulas and calculations
- US & Metric unit support
- 23 calculator categories
- 460+ unit conversions
- 8 temperature scales
- Offline functionality
- Save and share results

## Pricing and in-app purchases

Base price: $4.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| HVAC Pro | $3.99 | one-time |


## Recent user reviews (10 of 11)

All indexed reviews: https://appshunter.io/ios/app/hvac-formulator/id318898907/reviews.md

### 2/5 — Very very disappointed in the

*2016-01-23*

App I thought this would be a quick way to calculate the zones of a job from the pictures is showing that you can

### 1/5 — Extremely bad app

*2011-01-02*

Not worth a penny! I would not recommend it to anyone, student or professional - Too many wrongs to mention here. This is an open invitation for RIP-OFF... People read reviews before you buy!

### 1/5 — Crap

*2010-01-11*

My 2nd inpuls buy, I seen the price at the time I needed it and said what tha heck. Read reviews prier to buying ppl. This is stuff out of the text book if I would take time I would have found it. Add superheated subcooling do some real work with this program and give people so upgrades. Hurry.

### 3/5 — Useful HVAC app

*2009-11-15*

Lots of good formulas but agree it should come with metric as well

### 1/5 — Needs more work

*2009-11-09*

It did not help me . It still needs more work

### 1/5 — Disappointing

*2009-09-28*

Sales pitch greatly exceeds the capacity if this disappointing package

### 1/5 — HVAC Formulator

*2009-09-22*

Poor quality software and the help file is non existant- not worth downloading even if it were free!!

### 3/5 — not metric yet

*2009-09-13*

Lots of great formulas, more than i could ever hope to use BUT! this app would be good if it had a metric side. The Developer has said it may come in a future update so if you are in OZ i would wait till than.

### 5/5 — Helpful

*2009-09-13*

Pretty nice so far. It has been helpful in class.

### 2/5 — Not As Useful as it looked

*2009-07-16*

I thought that this would be a good application to use at work but found that a lot of it wasn't useful. The formulas can only be used to find a single result. (eg. mixed air formual will only find the final temp. but you can't used it to find the amount of outside air you required to get a known mixed air temp.). Some of the conversions are useless (Meters to Rods? Really? Why bother)
I wonder if this was made by technicians in the field. More useful and flexible formulas are needed.

## Frequently asked questions about HVAC Formulator

### What is HVAC Formulator?

HVAC Formulator is a mobile application designed for HVAC professionals, offering over 900 formulas and calculations for system design and load calculations. It supports both US and Metric units and includes numerous conversion tools.

### Does HVAC Formulator work offline?

Yes, HVAC Formulator is designed to work offline, meaning you do not need an internet connection to access its formulas, calculations, and unit conversions. This makes it ideal for use in the field.

### What types of calculations does HVAC Formulator include?

HVAC Formulator covers 23 calculator categories, including cooling load, fan laws, duct sizing, ventilation rate, electrical calculations, gas laws, psychrometrics, hydronic formulas, and many more essential for HVAC work.

### Can I switch between US and Metric units in HVAC Formulator?

Yes, HVAC Formulator allows you to switch instantly between US (Imperial) and Metric (SI) units. Input labels and conversions update automatically, displaying results in both systems.

### How many unit conversions are available in HVAC Formulator?

The app offers over 460 unit conversions across 16 categories, including metric, pressures, BTU, linear, square, cubic, liquid measures, weights, flows, power, and HVAC-specific conversions.

### What is the price of HVAC Formulator?

HVAC Formulator is a paid application, available for $4.99. This one-time purchase grants access to all its features and formulas.

### What devices is HVAC Formulator compatible with?

HVAC Formulator is supported on both iPhone and iPad devices. It is designed for iOS users.

### How often is HVAC Formulator updated?

The latest version of HVAC Formulator is 3.04, which was last updated on March 22, 2026. Updates typically include new features, bug fixes, and formula refinements.

## Version history (last 5 releases)

### 3.04 — 2026-03-22

Minor bug fixes

### 3.03 — 2026-03-16

bug fix

### 3.0.2 — 2026-02-25

Totally rewritten code, many additional formulas in additional categories.Ability to save results, compare results in the pro version.

### 3.0 — 2026-02-20

Totally rewritten code, many additional formulas in additional categories.

### 2.1.5 — 2013-04-17

Minor bug fixes additional metric formulas

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All apps by Historycentral.com: https://appshunter.io/developer/1744330560

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*