Inch to Millimeter Converter

Accurately convert inches (in) to millimeters (mm), suitable for length unit conversion

in
0 mm

Conversion formula: 1 inch = 25.4 millimeters

Calculation method: inch × 25.4 = mm

Inch to Millimeter Conversion Instructions

Inch (in) is a unit of length in the imperial system, and 1 inch is precisely equal to 25.4 millimeters. This is a standard international conversion relationship commonly used for precise measurements.

Common conversion values:

  • 1in = 25.4mm
  • 0.5in = 12.7mm
  • 0.25in = 6.35mm
  • 12in = 304.8mm (1 inch)

Usage:

  1. Enter the inch value
  2. Click "Convert" or press Enter
  3. Get the corresponding millimeter value
  4. Click "Copy" to copy the result

Usage Tips:

  • Suitable for precise measurements
  • Commonly used in machining
  • Accurate to one decimal place
  • Common unit in engineering design