how big is a millimeter

5 hours ago 2
Nature

A millimeter (mm) is a unit of length in the metric system. It is very small and is equal to:

  • One thousandth of a meter (1 mm = 0.001 meters)
  • About the thickness of a credit card or a dime
  • Approximately 0.039 inches

To visualize:

  • The thickness of a standard paper is roughly 0.1 mm, so a millimeter is about 10 times that thickness.
  • The width of a typical grain of rice is about 5 to 7 millimeters.

If you need a more specific comparison or examples, feel free to ask!