# Gear Ratio & Speed Calculator

> Gear Ratio & Speed Calculator (iPhone/iPad app by HyeongSeok Oh.)

- Source: https://appshunter.io/ios/app/gear-ratio-and-speed-calculator/id6809325091 (this page in markdown: same URL + `.md`)
- Developer: [HyeongSeok Oh](https://appshunter.io/developer/1474239115)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 16.0 · 6 MB
- Languages: English, German, Japanese, Korean, Portuguese, Spanish
- Released: 2026-09-14
- Data updated: 2026-09-15
- User reviews in markdown: https://appshunter.io/ios/app/gear-ratio-and-speed-calculator/id6809325091/reviews.md

## What is Gear Ratio & Speed Calculator?

Gear Ratio & Speed Calculator is the ultimate automotive engineering tool for car enthusiasts, track racers, off-road builders, and gearheads.

Calculate precise relationships between engine RPM, vehicle speed, transmission gear ratios, final drive ratios, and tire dimensions.

Key Features:
• RPM to Speed Calculator: Accurately calculate vehicle speed from engine RPM, gear ratio, and tire size.
• Speed to RPM Calculator: Determine the exact RPM required for target cruising or highway speeds.
• Gear Speed Matrix Table: Full-spectrum speed table across all gears and RPM intervals.
• Tire Size Calculator: Metric (e.g. 265/70R17) and Inch flotation (e.g. 33x12.50R17) conversions and diameter calculations.
• Setup Comparison: Side-by-side comparison for tire upgrades and ring & pinion gear changes.
• Vehicle Garage Profiles: Save and switch between multiple car configurations instantly.
• Unit Support: Seamless toggle between Metric (km/h, mm) and Imperial (mph, inches).

Privacy Policy:
https://domilabs.vercel.app/gear-ratio-calculator/privacy


## Version history (last 1 release)

### 1.0.0 — 2026-09-14

No release notes.

## More apps by HyeongSeok Oh

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All apps by HyeongSeok Oh: https://appshunter.io/developer/1474239115

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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 2026-09-15.*