1 Inch to Millimeter

Convert 1 (one) Inches to Millimeters (in to mm) with our conversion calculator.

1 Inches to Millimeters equals 25.4000 mm.

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  • Light Year

Convert 1 Inches to Millimeters (in to mm) with our conversion calculator.

1 Inches to Millimeters equals 25.4000 mm.

To convert inches to millimeters (mm), we utilize a conversion factor. The conversion factor from inches to millimeters is that 1 inch is equal to 25.4 millimeters. The calculation to convert 1 inch to millimeters is straightforward. You multiply the length value in inches by 25.4 to get the equivalent value in millimeters. Therefore, the calculation steps as follows: 1 inch * 25.4 mm/inch = 25.4 mm. Hence, 1 inch is equal to 25.4 millimeters.

This calculation is based on the definitions of inches and millimeters. An inch is a unit of length in the imperial and United States customary systems of measurement. Since the international yard has been defined as exactly 0.9144 meters, and a meter is defined in the International System of Units (SI) as the base unit of length, an inch therefore is defined as exactly 25.4 millimeters. This conversion factor allows for simple, precise conversions between the metric system and systems used in the United States and other countries that utilize inches for measurement. Such conversions are crucial in industries like manufacturing and engineering, where materials may be produced in one set of units and used in a context that utilizes the alternate set of units.

Here are 7 items that are approximately 1 inch in length:

  • Standard paperclip:

    • A typical medium-sized paperclip is often around 1 inch long, used for clipping together papers.
  • A quarter (US coin):

    • The diameter of a US quarter is just slightly less than 1 inch, making it a common reference for this measurement.
  • USB Type-A plug length:

    • The metal part of a USB Type-A plug is roughly 1 inch long, a familiar sight in data and charging cables.
  • AA battery diameter:

    • The diameter of a standard AA battery is close to 1 inch, familiar in household electronics.
  • Standard desktop pencil diameter:

    • A freshly sharpened pencil has a diameter near its point around 1 inch, a common tool in offices and schools.
  • SD card width:

    • The width of a standard SD card is close to 1 inch, important for digital storage in cameras and computers.
  • Matchstick length:

    • A standard matchstick length is about 1 inch, a simple tool for lighting fires.