Calculate the required belt length for drive systems using open or cross belt arrangements. Input pulley diameters and center distance to get the precise belt length needed.






249+ iOS apps curated and reviewed
If you already know Belt Length Calculator Pro, this is the deeper bench. 249+ belt length calculator pro apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of August 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 | $2.99 | 2.3★ (3) | No | No | Aug 2026 | |
| 2 | Free | — | No | No | May 2026 | |
| 3 | $1.99 | — | No | No | Jun 2026 | |
| 4 | $3.99 | — | No | No | May 2026 | |
| 5 | Free | — | No | No | Jun 2026 | |
| 6 | Free | 4.7★ (61K) | No | No | Sep 2026 | |
| 7 | $1.99 | — | No | No | Aug 2026 | |
| 8 | Free | 5.0★ (3) | No | No | Sep 2026 |






Calculate the required belt length for drive systems using open or cross belt arrangements. Input pulley diameters and center distance to get the precise belt length needed.









Calculate the necessary length for drive system belts with this utility. Supports both open and cross belt arrangements, requiring only pulley diameters and center length for accurate results.






This app offers both basic and scientific calculation modes with over 30 scientific operations. It allows for customization of the app's appearance and includes features for note-taking, drawing, and viewing calculation history. It supports high accuracy calculations and nested parentheses.




This app analyzes the frequency of a plucked timing belt to help you tune it accurately. It provides real-time feedback, historical data, and includes calculators for tension and belt length.


This engineering calculator helps determine belt length, ratio, RPM, and belt speed for pulley systems. It offers instant calculations with copyable results and includes formulas for reference.


Access technical conveyor belt information and perform on-the-spot calculations for professionals. Quickly determine belt dimensions, calculate length from coiled rolls, and estimate motor power for conveyor systems.


Calculate key parameters for a two-pulley system. Input pulley sizes, speed, power, and distance to determine belt velocity, tension, torques, wrap angle, and driven pulley RPM. Supports both imperial and metric units.




This app uses your phone's microphone to measure the sonic vibration frequency of a belt drive. It helps you determine if your bicycle belt tension needs adjustment by comparing the frequency to a provided chart. It also offers a calculator for bicycle belt drive parameters like speed ratio and center distance.




Perform calculations quickly and accurately with large buttons. Personalize the interface by selecting custom background and text colors. This straightforward utility is designed for intuitive use.


This advanced calculator app offers a powerful math core and algebra engine for basic to complex calculations. It includes features like step-by-step solutions, handwriting recognition, and 2D graphing, making it suitable for students, engineers, and programmers.


This app offers a free basic and scientific calculator with an intuitive interface. It supports fractions, percentages, and advanced editing. Optional upgrades provide specialized calculators for fractions with units, polynomial and linear equation solving, graphing, and geometric shapes.


This utility helps users determine the appropriate sling length for lifting applications. It considers various factors like hitch type, angle effects, and environmental conditions to ensure safe and adequate load carrying capacity.


This app offers a versatile calculator experience with both standard and scientific modes. Customize its appearance, use it in any orientation, and access additional tools like a notes tab and calculation history. It's designed for students and professionals needing accurate calculations.

