Size of A3

Measurements of paper A3.

  • A3 paper size in millimeters is 297 x 420 mm.
  • 29.7 x 42.0 centimeters.
A3 size in millimeters
  • A3 paper size in inches is 11.7 x 16.5 in.
A3 size in inches

Envelopes for A3 paper.

  • For an unfolded A3 you will need an C3 envelope.
  • Fold the A3 paper once – C4 envelope.

More A papers formats

See all paper sizes in A series.