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About
This engineering reference tool simplifies calculating ISO standard tolerances for mechanical design and manufacturing. It provides instant calculations for hole and shaft dimensions, with support for multiple units and a user-friendly interface.
✓ISO tolerance calculations for holes and shafts
✓Complete engineering tolerance reference table
✓Minimum, maximum, and average dimension calculations
✓Multi-unit support (mm, inches, micrometers)
✓Powerful search and filtering of designations
✓User-friendly interface with color-coded indicators
✓Dark mode support
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What's New in Tolerance Helper
1.7.0
September 21, 2026
Bug fixes and performance improvements.
User reviews
Developer apps
FAQ
What is Tolerance Helper?
Tolerance Helper is a free engineering reference tool designed to simplify the calculation of ISO standard tolerances for mechanical design and precision manufacturing. It allows users to quickly determine dimensions for both holes and shafts.
How does Tolerance Helper calculate tolerances?
You can enter a nominal dimension, and Tolerance Helper will instantly display all tolerance limits, including minimum, maximum, and average dimensions. It supports both hole and shaft designations like H7 and h7.
Does Tolerance Helper support different units of measurement?
Yes, Tolerance Helper supports multiple units. You can view tolerances in millimeters (mm), convert them to inches (in), and also convert to micrometers (μm) for highly precise work.
Can I search for specific tolerances in Tolerance Helper?
Tolerance Helper features a powerful search and filtering system. You can quickly find specific tolerance designations and filter by hole or shaft tolerances, with a history of recent searches for convenience.
Is Tolerance Helper available on multiple devices?
Tolerance Helper is designed for iOS devices, including iPhones and iPads. Its responsive layout ensures a good experience on both phones and tablets, supporting both portrait and landscape orientations.
What languages does Tolerance Helper support?
The app currently supports English and Russian languages, with a professionally translated interface and international engineering symbols to assist a global user base.
Does Tolerance Helper have ads?
No, Tolerance Helper is ad-free. As a free application, it does not contain any advertisements, allowing for an uninterrupted user experience.
How often is Tolerance Helper updated?
The latest version, 1.7.0, was released on September 21, 2026. While specific update frequency isn't detailed, the developer actively maintains the application.
