Inches to Millimeters

Understanding Inches and Millimeters

Inch (in) is a unit of length in the imperial measurement system, commonly used in the United States, United Kingdom, and some other countries. One inch equals exactly 25.4 millimeters.

Millimeter (mm) is a metric unit of length equal to one thousandth of a meter. Millimeters are used worldwide for precise measurements.

Inches to Millimeters Conversion Formula

To convert inches to millimeters, use this simple formula:

The factor 25.4 is an exact value established by the international standard ISO 31-1.

Conversion Examples

• 1 inch = 25.4 mm
• 2 inches = 50.8 mm
• 0.5 inch = 12.7 mm
• 3.5 inches = 88.9 mm
• 10 inches = 254 mm

Applications of Inch to Millimeter Conversion

Converting inches to millimeters is essential in various fields:

• Engineering — working with technical drawings and blueprints
• Construction — dealing with imported materials and tools
• Electronics — component sizes and PCB dimensions
• Automotive — wheel diameters and part specifications
• Manufacturing — standardizing product dimensions

Precision and Accuracy

Our calculator provides high-precision conversion with accuracy up to 3 decimal places. This ensures results suitable for professional calculations and technical applications.

Quick Reference Table