CAD Unit Converter

About This Tool

CAD Unit Converter provides precise, factor-based translation between measurement units used in computer-aided design. It supports common CAD units such as millimeters, centimeters, meters, inches, and feet, and adapts to various drafting standards and formats. The tool targets mechanical engineers, CAD technicians, designers, and students who must move drawings between systems or verify dimensional consistency during design reviews, interchange with suppliers, or when preparing BOM data. By performing conversions within the same workspace, it reduces context switches and minimizes transcription errors that occur when manually recalculating every dimension.
Conceptually, conversions rely on fixed factors defined in a unit-factor matrix and applied by a rules engine. Direct factors convert from source_unit to target_unit; when a direct factor is unavailable, the tool uses a minimal intermediate step through a common base unit (e.g., millimeters or meters). Outputs include the converted value, the factor used, and a note on precision. Advanced mode supports batch conversions by grouping multiple (value, unit) pairs for the same target unit.
Use cases include converting a 125.0 mm dimension to inches for a supplier drawing, validating a 0.5 in hole in metric tooling, or harmonizing units across assemblies in different CAD ecosystems. Unique value lies in a centralized conversion engine with strict accuracy, explicit factor traceability, and tolerance-preserving options. Core features include: unit-factor database, fixed-factor application, optional precision control, and the ability to export results for documentation, CAD imports, or specification sheets.

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