Tolerance Helper
ISO tolerance size calculator
Free · Designed for iPad. Not verified for macOS.
Precision engineering tool for ISO tolerance calculations. Quick search, interactive calculations, and multiple unit systems for machinists and engineers.
Tolerance Calculator
Tolerance Calculator is a comprehensive engineering reference tool for mechanical design and precision manufacturing professionals. This app simplifies the process of calculating dimensions with ISO standard tolerances for both holes and shafts.
Key Features
Comprehensive Tolerance Reference
Complete reference table of engineering tolerances
Support for both hole and shaft designations (e.g., H7, h7)
Spans all standard dimensional intervals
Easy Tolerance Calculation
Calculate minimum, maximum, and average dimensions
Enter a nominal dimension and view all tolerance limits instantly
Results displayed clearly with color-coded indicators
Copy results to clipboard with a single tap
Powerful Search and Filtering
Quick search for specific tolerance designations
Filter by hole or shaft tolerances
Recent searches history for faster access
Customizable tolerance filter to show only designations you need
Multi-unit Support
View tolerances in millimeters (mm)
Convert to inches (in) with proper precision
Convert to micrometers (μm) for precision work
User-Friendly Interface
Intuitive navigation with tolerance table
Clean, engineering-focused design
Clear color coding: blue for holes, green for shafts
Clickable cells for instant calculations
Accessibility Features
Dark mode support for low-light environments
Responsive layout for phones and tablets
Support for both portrait and landscape orientations
Localization
English and Russian language support
International engineering symbols
Professionally translated interface
Perfect For
Mechanical engineers
CNC machinists
Manufacturing technicians
Quality control specialists
Engineering students
Technical designers
Precision fabricators
Tolerance Calculator is the essential pocket reference for anyone working with precision mechanical parts. Calculate proper fits and clearances accurately without the need for paper tables or complex formulas.
Download now and simplify your engineering calculations!
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Improved column organization: Hole and shaft tolerances are now arranged in alternating pairs (H1, h1, H2, h2...) for easier comparison
The developer, Dmitriy Trofimov, 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
- Dmitriy Trofimov
- Size
- 30 MB
- Category
- Reference
- Compatibility
Requires iOS 12.0 or later.
- iPhone
Requires iOS 12.0 or later. - iPad
Requires iPadOS 12.0 or later. - iPod touch
Requires iOS 12.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2025 Dmitriy Trofimov