G-code Tool Offset

This tool computes G-code tool length offsets by mapping tool data to machine reference frames and active work offsets. It accepts inputs such as tool number, tool length value, unit system, and the currently active work offset (e.g., G54). It outputs the calculated offset value and the corresponding G-code command fragment (e.g., G43 Hn) ready for inclusion in a toolpath. Conceptually, it treats tool length offset as the difference between the tool tip position and the spindle datum, then applies the selected work offset to align the tool tip with the work origin. The calculator supports both metric and imperial units, multiple tools, and repeated recalculation during setup. Its primary beneficiaries are CNC programmers, machinists, and shop floor engineers who perform tool changes, zeroing, and calibration. The tool's unique value lies in validating offset data against tool data libraries, offering unit-aware results, and providing export-ready snippets that minimize human error. Core features include multi-tool input, unit handling, validation checks for missing or inconsistent tool data, and error reporting for out-of-range offsets. Typical use cases include tool length offset verification after tool changes, post-probe offset reconciliation, and quick sanity checks during fixture setup.