Chain & Sprocket Calculator

Gear Ratio & Speedometer Tools

$0.99 · Designed for iPad

Achieve perfect gearing with Chain & Sprocket Calculator – the all-in-one toolkit for chain drive systems. Designed for engineers, mechanics, and serious riders, this app delivers accurate calculations and insights to optimize your chain and sprocket setup. Whether you’re tuning a motorcycle’s final drive or designing an industrial conveyor, Chain & Sprocket Calculator provides the answers you need. Key Features & Benefits: Gear Ratio & Speed Calculator: Input your small and large sprocket teeth counts to instantly get the exact gear ratio. See how changes in sprocket size affect engine RPM and vehicle speed. For a given engine RPM, find out how fast you’ll go – in MPH or KPH – by entering the tire diameter on the driven sprocket (ideal for motorcycles, bicycles, go-karts, etc.). Ever wonder what speed you’d hit at redline in top gear? This app computes it for you in seconds. Chain Length & Adjustment: Determine the optimal chain length (number of links) for your sprocket combination. The calculator computes chain link count and precise center-to-center distance between sprockets. You can lock the center distance to see how many links are needed to fit a fixed axle distance, or conversely unlock it to see the center distance for a given chain length. This feature helps when adjusting wheel position for chain tension – for example, adding or removing a link to keep your motorcycle’s rear wheel within the adjuster range. No more trial and error – get the correct chain length before you break out the wrench. Common Chain Sizes Presets: Quickly select from standard roller chain pitches (ANSI #25, #35, #40, #50, #60, etc.) or enter a custom pitch. The app supports both inch and metric units (with automatic conversion), so you can work with chain pitch in inches or millimeters seamlessly. This ensures accuracy for any standard chain size you’re using. Sprocket Diameter & Wear Optimization: View the effective pitch diameter of both the small and large sprockets, useful for clearance and design considerations. The app goes further with an Optimal Wear Rate analysis – it calculates how often the same chain link contacts the same sprocket tooth. For example, if every 16th chain revolution brings the same link back to a particular tooth, that might be indicated as a 0% optimal wear scenario (meaning wear could concentrate on those links and teeth). The app presents this as a percentage and color code, so you can judge how evenly wear will distribute across the chain. A higher percentage means more even wear, prolonging the life of your chain and sprockets. In short, find the combination that minimizes uneven wear, saving you money on replacements. Interactive Sprocket Diagram: Visualize your setup with a scaled diagram of the sprockets and chain. The app animates the rotation, highlighting a reference tooth/link (you can even mark a specific tooth). This interactive view helps you double-check alignment and visualize how the chain wraps around each sprocket. It’s not only useful for verification – it’s also a great teaching aid or demonstration tool when explaining gear ratios and timing to others.

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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.

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    Accessibility

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    Information

    • Seller
      • Vladislav Zhirnov
    • Size
      • 3.2 MB
    • Category
      • Utilities
    • Compatibility
      Requires iOS 17.6 or later.
      • iPhone
        Requires iOS 17.6 or later.
      • iPad
        Requires iPadOS 17.6 or later.
      • Mac
        Requires macOS 14.6 or later and a Mac with Apple M1 chip or later.
      • Apple Vision
        Requires visionOS 1.3 or later.
    • 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+
    • Copyright
      • © zhirnov.zsystems
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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