This Dual-Dimension Tolerance Rounding Tool is designed to be an aid for professionals who convert engineering dimensions and tolerances between metric (mm) and imperial (in) units.
Therefore, its core purpose is to address the critical risk of tolerance inversion or tolerance growth that can occur when mathematically rounding converted limits. The utility applies a methodology commonly referred to as “inward rounding,” which helps ensure the calculated secondary tolerance zone remains contained within the original primary zone. Although SOLIDWORKS has similar functionality built-in, there may be other times when this calculation is necessary but not available in a particular software.
By presenting limits or bilateral deviations derived from this methodology, the tool assists in reducing manual calculation errors and provides a valuable general reference for maintaining the part’s original design intent.
Note on Use: This utility uses the online decimal.js library for precision; so whether you download the utility or use it here, you’ll need internet access. As always, the results generated should be verified by a professional and used in accordance with your organization’s standards.
Dual-Dimension Tolerance Rounding Tool
This utility is based on online sources, particular assumptions and calculations. This utility should only be used as a general reference. Results should always be verified. No one is responsible for incorrect information generated by this utility. Use thereof is the sole responsibility of the user. Use at your own risk.
