Comparison

HVAC Formulator vs Electrical Motor Calculator

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

Head to head
About

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.

Highlights
  • Over 900 formulas and calculations
  • US & Metric unit support
  • 23 calculator categories
  • 460+ unit conversions
  • 8 temperature scales
  • Offline functionality
  • Save and share results
Features
Read full description

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.

About

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.

Highlights
  • 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)
Features
Read full description

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

HVAC Formulator4 screens
Electrical Motor Calculator4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
HVAC Formulator versus Electrical Motor Calculator: the parameters behind the verdict, then further details
ParameterHVAC FormulatorElectrical Motor Calculator
Price$4.99$2.99 — better
Rating2.0 (1 ratings)3.8 (8 ratings) — better
Positive reviews9.1% of reviews—
Number of ratings18 — better
Update frequencyEvery 2 months — betterEvery 43 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.613 — better
Further details — not scored
Size73 MB1 MB
Age rating4+4+
DeveloperHistorycentral.comHeng Jia Liang

Customer experience

HVAC Formulator

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews11 reviews
Positive9.1%
Neutral18.2%
Negative72.7%

Electrical Motor Calculator

All ratings8 ratings
Positive62.5%
Neutral12.5%
Negative25.0%

In-app purchases

1 purchases

HVAC Formulator

One-time1
  • HVAC Pro$3.99
None

Electrical Motor Calculator

No in-app purchases

Questions

Is HVAC Formulator free?
HVAC Formulator costs $4.99, and also offers in-app purchases.
Is Electrical Motor Calculator free?
Electrical Motor Calculator costs $2.99, with no in-app purchases.
Which has better reviews, HVAC Formulator or Electrical Motor Calculator?
Electrical Motor Calculator is rated higher. HVAC Formulator averages 2.0 out of 5 from 1 ratings, while Electrical Motor Calculator averages 3.8 from 8 ratings.
Do HVAC Formulator or Electrical Motor Calculator have ads?
Neither HVAC Formulator nor Electrical Motor Calculator shows ads.
Which is updated more often, HVAC Formulator or Electrical Motor Calculator?
HVAC Formulator ships an update every 2 months, and Electrical Motor Calculator every 43 months. Most recently, HVAC Formulator was updated on October 18, 2026 and Electrical Motor Calculator on October 24, 2026.

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