Letter Size In mm (Millimeter)

What is the exact Letter size in mm (millimeters)? Find out exact Letter paper size dimensions in mm for your printing or designing job.

Letter Paper Size in mm

Letter is an American paper size, defined in inches. So the Letter size in mm that we give you below is calculated from these inch values.

The size of one sheet of Letter paper in mm is 279.4mm x 215.9mm.

Notes To Letter Dimensions in mm

  • mm is an SI unit, the abbreviation of millimetre (international spelling) or millimeter (American spelling).
  • As Letter is an American paper size, this Letter size in mm information is calculated from inches. But as mm is a small enough unit of length, the data given here can be treated as exact for everyday use.
  • To find out more information on the Letter paper size, click on the link.
    • letter paper size mm