# Belt Length Calculator Pro — Belt Drive & Pulley Tools

> Calculates drive system belt length based on pulley dimensions and center distance. (iPhone/iPad app by Imran Pinjara.)

- Source: https://appshunter.io/ios/app/belt-length-calculator-pro/id1487292230 (this page in markdown: same URL + `.md`)
- Developer: [Imran Pinjara](https://appshunter.io/developer/1484488781)
- Category: Utilities, Productivity
- Price: $2.99
- Rating: 2.30/5 from 3 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.1 · 1 MB
- Languages: American English
- Released: 2019-11-09
- Data updated: 2026-08-21
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/belt-length-calculator-pro/id1487292230/reviews.md

## What is Belt Length Calculator Pro?

Belt Length Calculator is a practical mechanical engineering tool for calculating belt length, pulley speed ratio, and belt speed for common belt drive systems.

Designed for mechanical engineers, maintenance engineers, plant technicians, machine designers, workshop professionals, and engineering students, the app provides fast and convenient calculations for belt and pulley systems used in industrial machinery and mechanical equipment.

The application helps reduce manual calculations and provides useful reference values for belt selection, machine design, maintenance, troubleshooting, and drive system analysis.

Included Calculators

• Open Belt Length Calculator
• Cross Belt Length Calculator
• V-Belt Length Calculator
• Speed Ratio Calculator
• Belt Speed Calculator

Open Belt Length

Calculate the required belt length for open belt drive arrangements.

Enter:

• Large Pulley Diameter
• Small Pulley Diameter
• Center Distance

The calculator provides the calculated belt length along with the relevant input and reference values.

Cross Belt Length

Calculate belt length for crossed belt drive arrangements.

Enter the large pulley diameter, small pulley diameter, and center distance to determine the required belt length.

This is useful when designing or checking crossed belt drive systems.

V-Belt Length

Calculate belt length for V-belt drive systems using the appropriate belt length calculation method.

This calculator is useful for V-belt selection, replacement, machine maintenance, and mechanical drive design.

Speed Ratio

Determine the speed relationship between driver and driven pulleys.

Enter:

• Driver Pulley Diameter
• Driven Pulley Diameter
• Driver RPM

Calculate:

• Speed Ratio
• Driven Pulley RPM

This helps analyze pulley relationships and determine the resulting driven speed.

Belt Speed

Calculate the linear speed of a belt based on pulley diameter and rotational speed.

Results are provided in:

• m/s for Metric units
• ft/s for Imperial units

Features

• Open belt length calculation
• Cross belt length calculation
• V-belt length calculation
• Pulley speed ratio calculation
• Driven pulley RPM calculation
• Belt speed calculation
• Metric and Imperial units
• Automatic unit conversion
• Clear calculation results
• Accurate mechanical engineering formulas
• Simple and professional interface
• Fast calculations
• No internet connection required

Applications

Belt Length Calculator is useful for:

• Mechanical Design
• Belt Drive Design
• Machine Design
• Industrial Machinery
• Plant Maintenance
• Equipment Maintenance
• Power Transmission Systems
• Workshop Engineering
• Manufacturing Equipment
• Mechanical Troubleshooting

Designed For

• Mechanical Engineers
• Design Engineers
• Maintenance Engineers
• Plant Engineers
• Machine Designers
• Workshop Technicians
• Maintenance Technicians
• Industrial Professionals
• Engineering Students

Whether you are selecting a replacement belt, checking an existing pulley system, designing a belt drive, calculating machine speed, or troubleshooting mechanical equipment, Belt Length Calculator provides a convenient engineering reference for everyday belt drive calculations.

The app combines multiple belt and pulley calculations in one simple tool, helping save time, reduce manual calculation errors, and improve efficiency during mechanical design and maintenance work.

## Key features

- Open belt arrangement calculation
- Cross belt arrangement calculation
- Input large pulley diameter
- Input small pulley diameter
- Input center length of pulleys
- Provides belt length output

## Chart rankings

- #196 in Top Paid · Utilities (US App Store)

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/belt-length-calculator-pro/id1487292230/reviews.md

### 1/5 — Pro

*2025-02-23*

Doesn’t work

### 1/5 — Won’t open

*2025-02-15, version 2.0*

Paid for it but won’t open with iPhone 14

### 5/5 — Storm Tech

*2022-11-04, version 1.0*

I used this belt calculation app many times , it really came in handy when I had to change sheaves and get the correct belt length. It kept me from buying different size length,

### 1/5 — Unimpressed

*2020-09-20, version 1.0*

It only works with millimeters. No in-app conversion available. Thanks for very little.

## Frequently asked questions about Belt Length Calculator Pro

### What is Belt Length Calculator Pro used for?

Belt Length Calculator Pro is used to calculate the required length of a belt for drive systems. It supports both open and cross belt arrangements, making it versatile for various mechanical setups.

### What information do I need to provide to use Belt Length Calculator Pro?

To calculate the belt length, you need to input the diameter of the large pulley, the diameter of the small pulley, and the center length between the two pulleys.

### What types of belt arrangements does Belt Length Calculator Pro support?

Belt Length Calculator Pro supports two primary belt arrangements: open belt arrangement and cross belt arrangement, which are common in drive systems.

### How accurate is Belt Length Calculator Pro?

The app provides a calculated result based on the inputs provided. User reviews indicate a rating of 2.3 stars from 3 ratings, suggesting potential areas for improvement in user satisfaction.

### What devices is Belt Length Calculator Pro available on?

Belt Length Calculator Pro is available for iPhone and iPad devices, catering to users within the Apple ecosystem.

### How much does Belt Length Calculator Pro cost?

Belt Length Calculator Pro is a paid application, priced at $2.99. There are no in-app purchases or advertisements mentioned.

### When was Belt Length Calculator Pro last updated?

The latest version of Belt Length Calculator Pro was released on April 29, 2023. This indicates ongoing support and potential for feature enhancements.

### What is the age rating for Belt Length Calculator Pro?

Belt Length Calculator Pro has an age rating of 4+, making it suitable for a wide range of users, including younger individuals with adult supervision.

## Version history (last 3 releases)

### 3.0 — 2026-08-20

Upgraded to Higher SDK level Support.
Changes in UI/UX.
Added V Belt length Calculator.
Added Speed Ratio Calculator.
Added Belt Speed Calculator.
Added Unit Settings Options.
Removed Decimal Fraction Chart.
Improved Input Field labels and placeholders.
Fix minor bugs/issues.

### 2.0 — 2023-04-29

Unit Setting Option Added.
mm/inches selector added.

decimal fraction chart added.
changes in App UI.
changes in App Theme.
Upgraded to Higher SDK levels to support the latest versions.
done button added on the keyboard.
keyboard dismiss issue fixed.
Improved App User Experience.
Fix minor Bugs and Stability issues.
Improved App Performance.

### 1.0 — 2019-11-09

No release notes.

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## More apps by Imran Pinjara

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All apps by Imran Pinjara: https://appshunter.io/developer/1484488781

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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 2026-08-21.*