Pulley and Belt Calculator
Gear Ratio, RPM & Length
$1.99 · Designed for iPad. Not verified for macOS.
Pulley & Belt Calculator instantly computes drive ratios, belt lengths, and pulley speeds (RPM) for both single and multi-stage belt drive systems. It takes the guesswork out of designing and tuning your mechanical projects. Designed for engineers, mechanics, and DIY makers, this app offers two dedicated calculation modes with rich visual diagrams to simplify complex pulley setups.
Key Features:
Two-Pulley Calculator: Calculate a two-pulley setup with ease. Input pulley diameters, center distance, and a known RPM to get the belt length, driven pulley RPM, speed ratio, and contact angles for your system.
Multi-Stage Calculator: Chain 2–4 pulley stages (multiple belts) to determine the overall gear ratio and final output RPM. Ideal for designing speed reductions or increases across several pulley sets. Includes a quick toggle for setting the initial driver on the bottom or top, accommodating both reduction and step-up scenarios.
Quick Adjust Tool: Fine-tune center distances effortlessly. This feature automatically equalizes the belt slack (gap) between pulleys on all stages for an optimal fit – especially useful in confined spaces or when you want uniform tension across belts.
Interactive Diagrams: Visualize your pulley system in action. The app provides animated, scaled diagrams of your belt drive, along with an RPM gauge, so you can see relative speeds and rotational motion in real time. This helps you intuitively understand the system’s behavior.
Export & Share: Save and share your results. With one tap, export a PDF report of your calculations – including inputs, results, and schematic diagrams – perfect for project documentation or collaboration. (For example, similar apps allow sharing results via text or email, and we’ve built this app to integrate seamless export for your convenience.)
User-Friendly & Offline: Enjoy a clean, ad-free experience. The interface is intuitive, with all inputs and results displayed clearly. All calculations run offline on your device (no internet required). Unit support is in metric (millimeters) for precise input; this caters to standard engineering measurements and ensures high accuracy in results.
Whether you’re a professional building industrial machinery or a hobbyist tuning an automotive belt drive, Pulley & Belt Calculator provides accurate results in seconds. It’s a must-have tool for anyone working with belt-driven systems – empowering you to design, optimize, and troubleshoot pulley setups with confidence and precision. Download now and take control of your pulley projects!
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Vladislav Zhirnov, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Vladislav Zhirnov
- Size
- 3.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.6 or later.
- iPhone
Requires iOS 16.6 or later. - iPad
Requires iPadOS 16.6 or later. - Mac
Requires macOS 13.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 31 more
- English, Arabic, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
4+
- 4+
- Copyright
- © zhirnov.zsystems
