# Gear & Engine Calculator — Ratio,Tire,Flow Rate & Airflow

> Vehicle gear ratio estimation and unit conversion utility for automotive enthusiasts. (iPhone/iPad app by Verosocial Studio.)

- Source: https://appshunter.io/ios/app/gear-and-engine-calculator/id425836445 (this page in markdown: same URL + `.md`)
- Developer: [Verosocial Studio](https://appshunter.io/developer/354566841)
- Category: Productivity, Travel
- Price: $0.99
- Rating: 3.00/5 from 2 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.3 · 4 MB
- Languages: English
- Released: 2011-03-21
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/gear-and-engine-calculator/id425836445/reviews.md

## What is Gear & Engine Calculator?

The Gear and Engine Calculators app is a very useful utility to give an estimate of vehicle’s (car, truck, motorcycle) gear ratio. Calculators are included and additionally supplied are helpful converters.

Calculators


- Gear Ratio

- Gear Selector

- Air Filter Height

- Ring and Pinion Ratio

Converters


- Tire Size

- Flow Rate

- Pressure Units

- Airflow Converter

- Temperature Conversion

Area Converters 

• Square Inches and Shorter Conversion 
• Square Feet & Yards & Meters Conversion 

Distance Converters 

• Inches & Centimeters & Millimeters Conversion 
• Feet & Yards & Meters Conversion 
• Nautical Miles, Statue Miles and Kilometers Conversion 

Volume Converters 

• US/Imperial to Metric Units Conversion 
• Metric to US/Imperial Units Conversion 
• Inches & Centimeters Volume Conversion 
• Feet, Yards, & Meters Volume Conversion

This app features: 

• Send your calculations or conversion by email 
• Universal App (iPhone, iPod Touch, and iPad) 
• Retina Display graphics 
• Fast app switching 
• Automatically Saves Your Inputs 
• All iPhone screen are supported

No network connectivity required.

The application is a universal app compatible with the iPhone, iPod Touch, and the iPad.

## Key features

- Gear Ratio Calculator
- Gear Selector
- Tire Size Converter
- Flow Rate Converter
- Airflow Converter
- Area, Distance, Volume Converters
- Email Calculation Sharing

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/gear-and-engine-calculator/id425836445/reviews.md

### 5/5 — Great app for engines

*2019-02-09, version 7.4*

Useful toolkit

### 5/5 — Cool app

*2013-09-15, version 6.0*

Fun to play "what if" with. And can give useful info.

### 1/5 — Outdated

*2011-09-02, version 1.03*

Disappointed.  There should be a means by which to enter a final gear ratio other than 1:1.  Every vehicle on the road today has an overdrive transmission.  It would certainly help if this app would permit the entry of the overdrive gear ratios to accurately calculate engine rpm, rpm at vehicle speed, etc.

### 1/5 — Frozen app

*2011-05-13, version 1.03*

I opened this app one time when I bought it.  The next time i opened the app I could no longer switch between different calculators in this app now I can't use this app at all.

## Frequently asked questions about Gear & Engine Calculator

### What is Gear & Engine Calculator used for?

Gear & Engine Calculator is a utility app that helps estimate a vehicle's gear ratio. It also includes helpful converters for tire size, flow rate, airflow, and various units of area, distance, and volume.

### What types of calculations can Gear & Engine Calculator perform?

It can calculate gear ratio, select gears, and determine ring and pinion ratios. It also offers converters for tire size, flow rate, pressure units, airflow, temperature, area, distance, and volume.

### Can I share my calculations from Gear & Engine Calculator?

Yes, you can send your calculations or conversions via email directly from the app, making it easy to share information with others.

### Does Gear & Engine Calculator require an internet connection?

No, the application does not require network connectivity, allowing you to perform calculations and conversions offline.

### What devices is Gear & Engine Calculator compatible with?

Gear & Engine Calculator is a universal app compatible with iPhone, iPod Touch, and iPad devices, supporting all iPhone screen sizes.

### What is the price of Gear & Engine Calculator?

Gear & Engine Calculator is a paid app, priced at $0.99.

### How often is Gear & Engine Calculator updated?

The latest version, 7.4, was released on February 9, 2019. The app was originally released on March 21, 2011.

### What is the age rating for Gear & Engine Calculator?

Gear & Engine Calculator has an age rating of 4+, indicating it is suitable for users aged 4 and above.

## Version history (last 1 release)

### 7.4 — 2019-02-09

Bug fixes to prevent crashing

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## More apps by Verosocial Studio

- [Heat Index & Category Calc](https://appshunter.io/ios/app/heat-index-and-category-calc/id370913314)
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- [Roadtrip: Fuel & Trip Planner](https://appshunter.io/ios/app/roadtrip-fuel-and-trip-planner/id377000731)
- [Torque Calculator, Units Conv](https://appshunter.io/ios/app/torque-calculator-units-conv/id379959718)
- [Gas Oil Mixture Ratio](https://appshunter.io/ios/app/gas-oil-mixture-ratio/id380750809)

All apps by Verosocial Studio: https://appshunter.io/developer/354566841

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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 2026-06-10.*