# Gearhead Light — Engine and Gearing Calculator

> Automotive performance calculator for engine, gearing, and tire parameters. (iPhone/iPad app by Innovate Engineering LLC.)

- Source: https://appshunter.io/ios/app/gearhead-light/id1477632731 (this page in markdown: same URL + `.md`)
- Developer: [Innovate Engineering LLC](https://appshunter.io/developer/1471540098)
- Category: Utilities, Productivity
- Price: Free
- Rating: 5.00/5 from 3 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 17 MB
- Languages: English
- Released: 2019-08-24
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/gearhead-light/id1477632731/reviews.md

## What is Gearhead Light?

If you are a hobby gearhead, you’ll want Gearhead Light! Gearhead Light is the free calculator app that us gearheads use for performance automotive parameters. It calculates engine, gearing & tire parameters. Gearhead Light works in both standard and metric units so you can select the most compatible parts for your application.

Gearhead Light calculates or estimates:

Speed/Gearing
- Engine RPM from vehicle speed, gearing, tire size
- Vehicle Speed from engine RPM, gearing, tire size
- Tire Diameter and Cross section width from sidewall size
- Simple gear ratios based on drive and driven tooth count

Engine
- Displacement from cylinders, bore, and stroke
- Bore/Stroke ratio
- Static Compression Ratio
- Compression Height (piston wrist pin height)
- Head gasket volume (from bore and compressed thickness if round)

If you are looking for more please check out our paid “Gearhead" apps.
None of our apps have ads or use invasive phone permissions

## Key features

- Engine RPM calculation
- Vehicle speed calculation
- Tire diameter and width estimation
- Gear ratio calculation
- Engine displacement calculation
- Static compression ratio calculation

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/gearhead-light/id1477632731/reviews.md

### 5/5 — Awesome!!!

*2021-07-08, version 2.1*

This app is awesome! I wouldn’t choose another. They keep it advertisement free which just takes the cake for me. Two thumbs up!

### 5/5 — Great app

*2020-06-29, version 2.1*

I love this app!!  Very useful, easy to use and saves time.

### 5/5 — Very useful !

*2020-05-07, version 2.1*

Great app for ios with no ads !  I will definitely get the full version soon!

## Frequently asked questions about Gearhead Light

### What can Gearhead Light calculate?

Gearhead Light can calculate engine RPM from vehicle speed, gearing, and tire size, as well as vehicle speed from engine RPM, gearing, and tire size. It also estimates tire diameter and cross-section width from sidewall size, and calculates simple gear ratios.

### Does Gearhead Light work with both standard and metric units?

Yes, Gearhead Light works in both standard and metric units, allowing users to select the most compatible parts for their specific application.

### What engine parameters can Gearhead Light calculate?

Gearhead Light calculates engine displacement from cylinders, bore, and stroke, bore/stroke ratio, static compression ratio, compression height, and head gasket volume.

### Is Gearhead Light free to use?

Yes, Gearhead Light is a free calculator app. The developer also offers paid 'Gearhead' apps for users looking for more advanced features.

### Does Gearhead Light have ads?

No, Gearhead Light does not have ads. The developer explicitly states that none of their apps use ads or invasive phone permissions.

### What devices is Gearhead Light available on?

Gearhead Light is available on iPhone, iPad, and iPod devices.

### How often is Gearhead Light updated?

Gearhead Light was last updated on August 24, 2019, with version 2.1. The release date was also August 24, 2019.

### What is the age rating for Gearhead Light?

Gearhead Light has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 1 release)

### 2.1 — 2019-08-24

No release notes.

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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.*