A3 paper format size and dimensions in mm cm and inches
A3 paper format size and dimensions in mm cm and inches

Height of A3 paper size: 297 mm. = 29.7 cm.
Width of A3 paper size: 420 mm. = 42 cm.

Dimensions of A3 in mm: 297 x 420 mm.
Dimensions of A3 in cm: 29.7 x 42 cm.
Dimensions of A3 in inches: 11.69″ x 16.54″

Graphic file dimensions in pixels for 300 DPI printing:
3508 x 4961 px.

Graphic file dimensions in pixels for 72 DPI printing:
842 x 1191 px.