# Gear Ratio Speed Calc — Multi-Stage Gear Drive Tool

> Multi-Stage Gear Drive Tool (iPhone/iPad app by Shanghai Sheyuan Network Technology Co., Ltd..)

- Source: https://appshunter.io/ios/app/gear-ratio-speed-calc/id6761039376 (this page in markdown: same URL + `.md`)
- Developer: [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858)
- Category: Utilities, Productivity
- Price: $1.99 (on sale, was $9.99)
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: English
- Released: 2026-03-25
- Data updated: 2026-07-08
- User reviews in markdown: https://appshunter.io/ios/app/gear-ratio-speed-calc/id6761039376/reviews.md

## What is Gear Ratio Speed Calc?

Designing a gear train and need to know the final output RPM and torque multiplier for single, dual, or triple stage setups? Enter driver and driven teeth counts, set your input RPM, and get instant results. Includes 8 common gear presets for fast selection on the shop floor.

FEATURES:
- Single, dual, and triple stage gear ratio calculations
- Calculate overall gear ratio, output RPM, and torque multiplier
- 8 common gear presets for quick selection
- Custom driver and driven teeth input for any gear combination
- Supports any input RPM value
- Clean, dark-themed interface for shop and field use

FORMULAS:
- Gear Ratio = Driven Teeth / Driver Teeth
- Output RPM = Input RPM / Overall Gear Ratio
- Torque Multiplier = Overall Gear Ratio
- Multi-stage: Overall Ratio = Stage 1 x Stage 2 x Stage 3

PRESETS INCLUDED:
12/48 (4:1), 15/45 (3:1), 18/36 (2:1), 20/40 (2:1), 16/64 (4:1), 24/72 (3:1), 20/60 (3:1), 14/56 (4:1)

Perfect for designing gear trains, verifying speed reductions, and calculating torque multiplication in mechanical power transmission systems.


## Version history (last 3 releases)

### 1.0.2 — 2026-06-28

Added a More Pro Tools section to discover related field calculators.

### 1.0.1 — 2026-04-15

Bug fixes and performance improvements.

### 1.0 — 2026-03-25

No release notes.

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All apps by Shanghai Sheyuan Network Technology Co., Ltd.: https://appshunter.io/developer/1560626858

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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 2026-07-08.*