HVAC Formulator
For HVAC Professionals
$4.99 · In‑App Purchases · Designed for iPad
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.
Totally rewritten code, many additional formulas in additional categories.Ability to save results, compare results in the pro version.
The developer, Historycentral.com, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Historycentral.com Inc
- Size
- 76.3 MB
- Category
- Productivity
- Compatibility
Requires iOS 18.6 or later.
- iPhone
Requires iOS 18.6 or later. - iPad
Requires iPadOS 18.6 or later. - Mac
Requires macOS 15.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.6 or later.
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- HVAC Pro $3.99
- Copyright
- © Historycentralcom 2026