# HVAC Formulator vs Electrical Motor Calculator

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.

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.

## The numbers

| Metric | HVAC Formulator | Electrical Motor Calculator |
| --- | --- | --- |
| Price | $4.99 | **$2.99** |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/hvac-formulator/id318898907/reviews) | **[3.8 (8 ratings)](https://appshunter.io/ios/app/electrical-motor-calculator/id1635906150/reviews)** |
| Number of ratings | 1 | **8** |
| Positive reviews | 9.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 43 months |
| Monetization | Paid | Paid |
| Size | 73 MB | 1 MB |
| Requires iOS | 18.6 | **13** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Heng Jia Liang](https://appshunter.io/developer/1532000635) |

## What reviewers say

### HVAC Formulator

[App page](https://appshunter.io/ios/app/hvac-formulator/id318898907)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

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


### Electrical Motor Calculator

[App page](https://appshunter.io/ios/app/electrical-motor-calculator/id1635906150)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*