# Pulley Calculator — Pulley Size, RPM, Speed etc

> Engineering calculator for pulley system dimensions and performance. (iPhone/iPad app by Nitrio.)

- Source: https://appshunter.io/ios/app/pulley-calculator/id1388205210 (this page in markdown: same URL + `.md`)
- Developer: [Nitrio](https://appshunter.io/developer/321121189)
- Category: Utilities, Productivity
- Price: $2.99
- Rating: 3.70/5 from 34 App Store ratings · 8 written reviews indexed
- Age rating: 4+
- Requires: iOS 13 · 1 MB
- Languages: American English
- Released: 2018-06-21
- Data updated: 2026-09-04
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/pulley-calculator/id1388205210/reviews.md

## What is Pulley Calculator?

Pulley Calculator is a engineering calculator to calculate Belt Length, Ratio, RPM, Belt Speed, Pulley Gap.

Features:
- Instant calculation
- Result are copy able to other apps
- RPM are calculate once one of the RPM[Larger or Small] receive input
- Formulas are include as reference

A pulley is simply a wheel with a groove in it, and a rope in the groove. It is also called a drum or a sheave. The groove is important because it helps to keep the rope in place. It is used to lift up or lower heavy objects. With a pulley, an object to be lifted can be tied to one end of the rope, and a force is applied to the other end by pulling the rope downwards. The downward force turns the wheel with the rope and pulls the load upwards at the other end. 

it designed to support movement and change of direction of a taut cable or belt, or transfer of power between the shaft and cable or belt. In the case of a pulley supported by a frame or shell that does not transfer power to a shaft, but is used to guide the cable or exert a force, the supporting shell is called a block, and the pulley may be called a sheave.

A pulley may have a groove or grooves between flanges around its circumference to locate the cable or belt. The drive element of a pulley system can be a rope, cable, belt, or chain.

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

## Key features

- Calculate Belt Length
- Calculate Ratio
- Calculate RPM
- Calculate Belt Speed
- Instant calculations
- Copyable results
- Includes formulas

## Recent user reviews (8 of 8)

All indexed reviews: https://appshunter.io/ios/app/pulley-calculator/id1388205210/reviews.md

### 1/5 — Only metric

*2026-04-16*

Bought the app but no option for imperial measurements

### 1/5 — Doesn’t work

*2024-12-05*

Gives me wrong pulley size ever time

### 3/5 — Perfect, but only metric units

*2024-03-08*

This is an ideal app for simple speed calculations.  I volunteer with antique equipment association where we commonly use flat belt equipment.  There is a frequent need to do speed calculations for machinery.

My only complaint is that all units are in metric.  Shouldn’t make a difference for speeds, but belt speed isn’t useable without conversions.  Wish there was a toggle to convert to imperial measurements

### 1/5 — Millimeter or what?

*2022-03-09*

Inches?

### 1/5 — What are we looking at

*2022-02-25*

What are the numbers? Are they Standard or metric? in inches or millimeters?

### 5/5 — Great app.

*2021-12-23*

Simple. Never fails.

### 4/5 — Pulley Calc

*2021-07-16*

Works Great, But Needs Landscape Mode for iPad

### 3/5 — Great App, but needs one simple feature

*2018-10-07*

The app does exactly what it’s supposed to do, but needs the option to view/input imperial dimensions.

## Frequently asked questions about Pulley Calculator

### What is the price of Pulley Calculator?

Pulley Calculator is a paid app, priced at $2.99. This one-time purchase grants you access to all its features without any additional costs or subscriptions.

### Does Pulley Calculator have ads?

No, Pulley Calculator is ad-free. You can use the application without any interruptions from advertisements, ensuring a focused calculation experience.

### What devices is Pulley Calculator compatible with?

Pulley Calculator is designed for iOS devices, including iPhone, iPad, and iPod. It is optimized to run on these platforms.

### How often is Pulley Calculator updated?

The latest version of Pulley Calculator is 1.2, last updated on January 6, 2026. While specific update frequency isn't detailed, this indicates ongoing support and development.

### What is the age rating for Pulley Calculator?

Pulley Calculator has an age rating of 4+, making it suitable for a wide range of users. This indicates it contains no mature content.

### Can I copy the results from Pulley Calculator?

Yes, the results from Pulley Calculator are copyable. This feature allows you to easily transfer calculated values to other applications for further use or documentation.

### What kind of calculations does Pulley Calculator perform?

Pulley Calculator performs instant calculations for belt length, ratio, RPM, and belt speed. It also includes the relevant engineering formulas for reference.

### What do users like about Pulley Calculator?

Users appreciate the instant calculation feature and the ability to copy results. The inclusion of formulas also adds value for understanding the engineering principles behind the calculations.

## Version history (last 3 releases)

### 1.2 — 2026-01-06

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

### 1.1 — 2020-09-07

- Update for Newest Devices.

### 1.0 — 2018-05-27

No release notes.

## Apps similar to Pulley Calculator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Gear Simulation & Calculation](https://appshunter.io/ios/app/gear-simulation-and-calculation/id1618701429) | 4.3 (11) | $3.99 | Utilities |
| [Pulley & Belt calculator](https://appshunter.io/ios/app/pulley-and-belt-calculator/id6470370055) | 1.3 (3) | $1.99 | Utilities |
| [Belt Length Calculator Pro](https://appshunter.io/ios/app/belt-length-calculator-pro/id1487292230) | 2.3 (3) | $2.99 | Utilities |
| [Belt Length Calculator](https://appshunter.io/ios/app/belt-length-calculator/id1490691852) | — | $1.99 | Utilities |
| [Slope Calculator & Arc Finder](https://appshunter.io/ios/app/slope-calculator-and-arc-finder/id1445840295) | 2.3 (3) | $3.99 | Utilities |
| [My Belt App](https://appshunter.io/ios/app/my-belt-app/id6742230805) | 5.0 (1) | Free | Utilities |

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All apps by Nitrio: https://appshunter.io/developer/321121189

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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 2026-09-04.*