Inches to Millimeters Converter
Convert inches to millimeters effortlessly with our free in to mm converter. Perfect for engineering specifications, manufacturing tolerances, 3D printing, and converting imperial measurements to metric precision units.
Convert Inches to Millimeters
Conversion: 1 in = 25.4 mm
Why Convert Inches to Millimeters?
Inches are widely used in American manufacturing, hardware, and consumer products. Millimeters are the international standard for precision engineering, 3D printing, and scientific measurements. Converting inches to millimeters is essential when creating CAD drawings for international manufacturers, specifying tolerances for CNC machining, designing for 3D printing, or communicating with metric-based engineering teams.
How the Conversion Works
The conversion from inches to millimeters uses the exact definition that 1 inch equals 25.4 millimeters. Our converter multiplies your inch value by 25.4 to calculate the equivalent in millimeters. This is an exact conversion by international agreement since 1959, ensuring perfect accuracy for precision engineering.
When to Use This Converter
Use this inches to millimeters converter when preparing CAD files for metric CNC machines, converting American hardware sizes for international projects, designing 3D printed parts, specifying engineering tolerances, converting screen resolution measurements, or working with international manufacturing partners.
Frequently Asked Questions
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