HVAC Formulator vs Electrical Motor Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HVAC Formulator
This app provides HVAC professionals with over 900 essential formulas and calculations for load calculations and system design. It supports both US and Metric units, offers instant switching, and includes 23 calculator categories and over 460 unit conversions. Designed for field use, it works offline and allows users to save and share results.
- Over 900 formulas and calculations
- US & Metric unit support
- 23 calculator categories
- 460+ unit conversions
- 8 temperature scales
- Offline functionality
- Save and share results
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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.
Electrical Motor Calculator
This engineering tool calculates key electrical motor characteristics like amps, horsepower, and kVa. Input system voltage, motor efficiency, and power factor to determine electrical values for your system.
- Calculate amps, horsepower, and kVa
- Input system voltage and motor efficiency
- Converts kilowatts to horsepower
- Defines Power Factor (PF) and Full Load Amps (FLA)
- Calculates Running Load Amps (RLA)
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Electrical Motor Calculator is an engineering tool to calculate amps, horsepower, kilowatt and kVa base on electrical motor formula. Electrical Motor Calculator calculated values and are intended for use as a means of indicating expected values for electrical motor and similar product. Values will vary in service with load conditions, condition, age and type of motor. Electrical Motor Calculator lets you figure out electrical characteristics of your system given a specific motor. By inputting horsepower, kilowatt, motor efficiency, power factor, and system voltage the system will calculate the amps, horsepower, kilowatt and kVa. PF - Power Factor - three phase motors (0 - 100%) or (0.0 - 1.0) FLA - "Full Load Amps" - the amount of current when a motor is at its full rated output power. FLA is the running load + 25%. RLA - "Running Load Amps" - current drawn during normal operation of electric motor. 1 kVA = 1,000 volt amps Kilowatts to horsepower conversion 1 HP = 0.7457 kW 1 kW = 1.34102 HP Thanks for your support and do visit nitrio.com for more apps for your iOS devices.
Screenshots
Verdict
The clearest difference is rating: Electrical Motor Calculator at 3.8 against HVAC Formulator's 2.0. Electrical Motor Calculator also leads on in-app purchases (none vs 1) and ratings volume (8 vs 1). HVAC Formulator's advantage is update cadence (every 2 months vs every 43 months). On ads, 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
HVAC Formulator costs $4.99 and Electrical Motor Calculator $2.99 up front. HVAC Formulator sells 1 one-off in-app purchase. Electrical Motor Calculator asks for nothing beyond the download.
Electrical Motor Calculator holds the better App Store score, 3.8 against 2.0. That said, the two scores are not equally well evidenced: Electrical Motor Calculator has 8 ratings behind it against 1, so its average is the more settled of the two.
HVAC Formulator ships an update every 2 months, Electrical Motor Calculator every 43 months. The most recent releases landed on October 18, 2026 and October 24, 2026 respectively.
| Parameter | HVAC Formulator | Electrical Motor Calculator |
|---|---|---|
| Price | $4.99 | $2.99 — better |
| Rating | 2.0 (1 ratings) | 3.8 (8 ratings) — better |
| Positive reviews | 9.1% of reviews | — |
| Number of ratings | 1 | 8 — better |
| Update frequency | Every 2 months — better | Every 43 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 13 — better |
| Further details — not scored | ||
| Size | 73 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Historycentral.com | Heng Jia Liang |
Customer experience
HVAC Formulator
Electrical Motor Calculator
In-app purchases
HVAC Formulator
- HVAC Pro$3.99
Electrical Motor Calculator
No in-app purchases
Questions
Is HVAC Formulator free?
Is Electrical Motor Calculator free?
Which has better reviews, HVAC Formulator or Electrical Motor Calculator?
Do HVAC Formulator or Electrical Motor Calculator have ads?
Which is updated more often, HVAC Formulator or Electrical Motor Calculator?
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