# Spur Gear Calculator

> Spur gear dimension calculator for outside diameter, center distance, and ratio. (iPhone/iPad app by SpiralArm Consulting Limited.)

- Source: https://appshunter.io/ios/app/spur-gear-calculator/id827110560 (this page in markdown: same URL + `.md`)
- Developer: [SpiralArm Consulting Limited](https://appshunter.io/developer/836987822)
- Category: Utilities, Business
- Price: Free
- Rating: 3.70/5 from 3 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 11 MB
- Languages: American English
- Released: 2014-03-04
- Data updated: 2026-06-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/spur-gear-calculator/id827110560/reviews.md

## What is Spur Gear Calculator?

This is a specialised set calculators that uses the gear systems (Diametral Pitch or Module) and the number of teeth to calculate the Outside Diameter, Centre Distance and Ratio of Spur gears and pinions.

Please note that these calculators should ONLY be used for spur gears and pinons, NOT for Helical gears.

## Key features

- Calculate Outside Diameter
- Calculate Centre Distance
- Calculate Ratio
- Supports Diametral Pitch
- Supports Module
- Spur gear and pinion specific

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/spur-gear-calculator/id827110560/reviews.md

### 5/5 — Neat and very useful for calculating gears to make or buy

*2021-06-16*

Been making gears some and wondered if there was already a app too help with the math, and this one does exactly what I need, no more needing to look up formulas in the books!!  Just answer a couple questions/dimensions and done!!

## Frequently asked questions about Spur Gear Calculator

### What dimensions can Spur Gear Calculator calculate?

Spur Gear Calculator can compute the Outside Diameter, Centre Distance, and Ratio for spur gears and pinions.

### What units of measurement does Spur Gear Calculator support?

The calculator supports both Diametral Pitch and Module systems for gear calculations.

### Can Spur Gear Calculator be used for helical gears?

No, Spur Gear Calculator is specifically designed for spur gears and pinions only and should not be used for helical gears.

### What is the rating for Spur Gear Calculator?

Spur Gear Calculator has a rating of 3.7 stars based on 3 user reviews.

### Is Spur Gear Calculator free to use?

Yes, Spur Gear Calculator is available for free.

### What devices is Spur Gear Calculator compatible with?

Spur Gear Calculator is compatible with iPhone, iPad, and iPod devices.

### When was Spur Gear Calculator last updated?

The latest version of Spur Gear Calculator was released on August 29, 2017.

### Does Spur Gear Calculator have ads?

Spur Gear Calculator does not contain advertisements.

## Version history (last 5 releases)

### 4.0.0 — 2017-08-29

This app has been updated by Apple to display the Apple Watch app icon.

Modified User Interface
Latest iOS

### 3.0 — 2016-06-18

Updated to latest iOS
New User Interface
Added iPad compatibility and persistent input data
Some small bug fixes

### 2.0.1 — 2015-06-17

Upgrade to support 64bit.

### 2.0.0 — 2014-06-12

New Ratio Calculator
Documentation Updated
Updated 'Copy To' Function

### 1.1.0 — 2014-04-02

Updated Help
New Setting Tab
New options to change setting across calculators

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## More apps by SpiralArm Consulting Limited

- [QRSecret](https://appshunter.io/ios/app/qrsecret/id657457883)
- [Gear Lab](https://appshunter.io/ios/app/gear-lab/id1013375198)
- [Gear Lab Pro](https://appshunter.io/ios/app/gear-lab-pro/id1180676834)
- [Now Departing](https://appshunter.io/ios/app/now-departing/id1309671772)
- [DaysLeft](https://appshunter.io/ios/app/daysleft/id1609778180)

All apps by SpiralArm Consulting Limited: https://appshunter.io/developer/836987822

## Related topics

[spur gear calculator](https://appshunter.io/ios/topics/spur-gear-calculator) · [gear calculator](https://appshunter.io/ios/topics/gear-calculator) · [sup gear](https://appshunter.io/ios/topics/sup-gear) · [sup gears](https://appshunter.io/ios/topics/sup-gears) · [gears](https://appshunter.io/ios/topics/gears) · [gears utility](https://appshunter.io/ios/topics/gears-utility)

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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 2026-06-07.*