Height of C3 paper size: 324 mm. = 32.4 cm.
Width of C3 paper size: 458 mm. = 45.8 cm.
Dimensions of C3 in mm: 324 x 458 mm.
Dimensions of C3 in cm: 32.4 x 45.8 cm.
Dimensions of C3 in inches: 12.76″ x 18.03″
Graphic file dimensions in pixels for 300 DPI printing: 3827 x 5409 px.
Graphic file dimensions in pixels for 72 DPI printing: 918 x 1298 px.