# Gear Simulation & Calculation — Calculate Gears Fast and Easy

> Calculates gear ratio, torque, speed, and mechanical advantage for gear trains. (iPhone/iPad app by Heng Jia Liang.)

- Source: https://appshunter.io/ios/app/gear-simulation-and-calculation/id1618701429 (this page in markdown: same URL + `.md`)
- Developer: [Heng Jia Liang](https://appshunter.io/developer/1532000635)
- Category: Utilities, Productivity
- Price: $3.99
- Rating: 4.30/5 from 11 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 1 MB
- Languages: American English
- Released: 2022-04-11
- Data updated: 2026-08-16
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/gear-simulation-and-calculation/id1618701429/reviews.md

## What is Gear Simulation & Calculation?

Gear Simulation and Calculation calculate the gear ratio, torque and speed of gears train system.
Plus quickly simulate how the gear train work on the fly.

This is a great tool especially for DIYer who want to design their own Gears Train System quick and easy.
Preview how these system work before 3D print own gear system.


Features:
∙ Calculate gears fast and easy with parameter 
∙ Input gear teeth number
∙ Output gear teeth number
∙ Input gear speed [rpm]
∙ Output gear speed [rpm]
∙ Input gear torque [Nm]
∙ Output gear torque [Nm]
∙ Output wheel diameter [in/cm]
∙ Calculate wheel speed [mph/kmh/ms⁻¹]
∙ Calculate Gear Ratio
∙ Calculate Mechanical Advantage


Formula:
Gear Ratio = input gear teeth number / output gear teeth number

Mechanical Advantage = output gear teeth number / input gear teeth number

Wheel Speed = output gear speed * wheel diameter * .pi * 60 / 63360


Law of Gearing:
T1/T2 = d1/d2 = n1/n2 = ω1/ω2
T1 and T2 = Number of Teeth on driver and driven gear respectively.
d1 and d2 = driver and driven gear diameter respectively.
n1 and n2 = Gear Speed in RPM for driver and driven gear respectively.
ω1 and ω2 = Angular Velocity in radian/sec for driver and driven gear respectively.


A gear is a circular machine element that can control the rotational movement's direction, torque, and speed. Gears are a necessary component of any machine having moving parts, such as a wristwatch or a car. are important components in modern engineering. A Gear train consists of two or more gears in series. It is used to increase or decrease the speed or torque of the output shaft. 

The Gear Calculator calculates the mechanical advantage of a two-gear system in a machine. The gear ratio indicates how much a system's output gear is sped up or slowed down, as well as how much torque is lost or gained.

Gears available in a variety of shapes and sizes (the most common are involute gears), and these distinctions indicate how the rotating movement is translated or transferred. When two or more gears in a system mesh together while in motion, movement is transmitted. This set of gears is referred to as a gear train.

In a gear train, the gear ratio is the ratio of the input gear circumference to the output gear circumference. The gear ratio is used to calculate the number of teeth required for each gear to achieve the specified output speed/angular velocity, or torque.

Mechanical advantage in terms of torque
Riding a bike uphill is easier if you use a low-speed gear. When you do this, you get more torque and more power when travelling uphill. 

Mechanical advantage in terms of speed
Hand drills are a good example of a simple machine that has a mechanical speed advantage. The drill bit spins at a high speed when the handle is cranked.


Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

## Key features

- Calculate gear ratio
- Calculate torque and speed
- Simulate gear train operation
- Input/output gear teeth number
- Calculate mechanical advantage
- Calculate wheel speed and diameter

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/gear-simulation-and-calculation/id1618701429/reviews.md

### 3/5 — Great, but limits ratios

*2026-02-05*

I love the visual representation of the gears! However I need a ratio far higher than 100. Above 100 it would most likely limit the graphical teeth drawn/shown, but it would allow to use the calculator without limits. Wish I knew this before I downloaded it.

### 4/5 — Nice app, I want more though.

*2025-06-30*

This is a great app, i wish it had more features though. for example: being able to type numbers into the box rather than being limited by the slider, being able to add more gears, change color of gears, fill the gears in with colors or patterns to be able to see better. also just more controls in general.

## Frequently asked questions about Gear Simulation & Calculation

### What is Gear Simulation & Calculation used for?

Gear Simulation & Calculation is used to calculate the gear ratio, torque, and speed of gear train systems. It also allows users to simulate how these systems work in real-time, which is helpful for designing custom gear systems.

### What are the key calculations provided by Gear Simulation & Calculation?

The app calculates essential parameters such as gear ratio, mechanical advantage, input/output gear speeds and torque, and wheel diameter and speed. It provides formulas and explanations for these calculations.

### Who would benefit most from using Gear Simulation & Calculation?

This app is particularly beneficial for DIYers who want to design their own gear train systems quickly and easily. Engineers and students studying mechanical principles would also find it a valuable tool.

### How does Gear Simulation & Calculation help with 3D printing projects?

The app allows users to preview how their designed gear systems will work on the fly. This simulation capability helps ensure the design is functional before committing to 3D printing, saving time and resources.

### What devices is Gear Simulation & Calculation available on?

Gear Simulation & Calculation is available for iPhone, iPad, and iPod devices, as indicated by its supported devices list.

### What is the price of Gear Simulation & Calculation?

Gear Simulation & Calculation is a paid application, priced at $3.99. It does not appear to have in-app purchases or advertisements.

### How often is Gear Simulation & Calculation updated?

The app was last updated on January 17, 2026, with version 1.1 being the latest release. This indicates a recent update, suggesting ongoing support and potential for future improvements.

### What is the age rating for Gear Simulation & Calculation?

The app has an age rating of 4+, making it suitable for a wide range of users, including younger individuals interested in mechanical concepts.

## Version history (last 2 releases)

### 1.1 — 2026-01-17

- Updated for the newest devices.
- Minor bugs fixed.

### 1.0 — 2022-04-11

No release notes.

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All apps by Heng Jia Liang: https://appshunter.io/developer/1532000635

## Related topics

[gear simulator](https://appshunter.io/ios/topics/gear-simulator) · [gear ratio calculator lite](https://appshunter.io/ios/topics/gear-ratio-calculator-lite) · [gear ratio calculator 2](https://appshunter.io/ios/topics/gear-ratio-calculator-2) · [gear calculator pro](https://appshunter.io/ios/topics/gear-calculator-pro) · [gear ratio calculator](https://appshunter.io/ios/topics/gear-ratio-calculator)

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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 2026-08-16.*