A3 Paper Size is 297 x 420

The A3 paper size can be brought from most good stationary shop and large supermarkets. If you need to get an idea of the size of A3 Paper size then get 2 sheets of paper and lay them side by side.
A3 = 2 x a4 / half an A2.

A3 Paper Measurements

Millimeters - 297 x 420 mm
Centimeters - 29.7 x 42.0 cm
Inches / Decimal - 11.69 x 16.54 inches     
Inches / Fraction - 11 11/16 x 23 9/16     (closest 16th)
Points - 842 x 1191 pt
Picas - 70.16 x 99.22

A3 Paper Size for digital images

Pixels at 72 PPi - 842 x 1191 ppi - 1 million pixels
CMYK - 3.8 MB
RGB - 3.0 MB
Gray Scale - 1.0 MB
Bitmap - 0.25 MB

Pixels at 150 PPi - 1754 x 2480 ppi - 4.3 million pixels
CMYK - 16.6 MB
RGB - 12.4 MB
Gray Scale - 4.2 MB
Bitmap - 0.52 MB

Pixels at 300 PPi - 3508 x 4961 ppi - 17.4 million pixels
CMYK - 66.4 MB
RGB - 49.8 MB
Gray Scale - 16.6 MB
Bitmap - 2.08 MB

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To have your A3 design printed take a look at our A3 poster printing page info for photo quality prints

A0 paper size A1 paper size A2 paper size A3 paper size A4 paper size