Dimension scores are derived from public data and fields; weighted into the composite. Reference only.
Hole Calc is a highly focused web-based developer/engineering tool used to calculate a bore diameter from three measuring pins. The page provides inputs for Pin 1, Pin 2, and Pin 3, and supports selecting pin grades and tolerances. When Tolerance is enabled, the result is shown as a range based on the grade of the measuring pins used, rather than as a single value. This makes it suitable for quick calculations in machining, metrology inspection, and quality control.
Based on the crawled content, its core capabilities include calculating bore diameter from three pins, selecting measuring pin tolerance grades, switching between inch and millimeter units, and setting display precision from 0.1 to 0.0001. The project states that it is open-source software and welcomes bug reports, feature requests, and code contributions. It also provides a GitHub repository for viewing the license and technical documentation. In terms of the tech stack, the text explicitly mentions that it is built with the Flask microframework, uses Pure.css for frontend layout and styling, and uses Space Grotesk for headings and menus.
No paid plans, account system, or commercial subscription information appears on the page, so it can be regarded primarily as a free, open-source tool. Its open-source nature is a major advantage: engineering teams can review the calculation logic, adapt it to internal metrology standards, and potentially build on the repository for secondary development. However, the text does not clearly provide self-hosting installation steps, API, or SDK information, so it is not possible to confirm whether it is suitable for direct integration into enterprise systems.
Its advantages are a clear focus, few input fields, a low barrier to use, and support for tolerance grades and unit switching, covering key variables in real measuring-tool workflows. The limitations are also clear: it only solves the narrow use case of three-pin bore calculation; it does not mention batch calculation, data export, APIs, permission management, or integration with CAD/CAM or quality inspection systems; and support mainly depends on the GitHub community, with no commercial SLA or response commitment.
It is suitable for machine shops, inspectors, manufacturing engineers, gauge engineers, and developers who need to verify bore-diameter calculation formulas. For users in China, the crawled text does not provide information about servers, CDN, ICP filing, or access stability, so china_access can only be rated as unknown. Payments are not involved. If access is limited or stronger localization is needed, alternatives include building an Excel/script-based calculator, using formulas from engineering handbooks, or using similar calculation modules in CAD/CAM or metrology software.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on holecalc.com official site.
holecalc.com is an Unknown Online Tools provider. TG4G tracks its product information, an overall rating of 7.0/10, and a China-accessibility score of China direct-connect friendly. Click "Visit Official Site" to reach holecalc.com directly.