Unit mistakes are small on screen and expensive in manufacturing. Use this simple converter when moving between metric and inch-based CAD drawings.
Millimetres to Inches
Enter a value.
Inches to Millimetres
Enter a value.
Conversion Factors
1 inch = 25.4 mm
1 mm = 0.0393701 inch
CAD Drawing Tip
Always confirm the drawing units and the required manufacturing standard before converting dimensions. Do not use conversion alone to choose tolerances, fits or surface-finish requirements.
Related Resources
H7 and g6 Fits · Dimensioning Mechanical Drawings · All Design Guides