‘Dimensions of A3 Paper Size’

What are the dimensions of an A3 paper sheet in mm, cm, and inches? What is the ratio of its longer side to the shorter side, and by how much is it larger than an A4 sheet?

Dimensions of an A3 paper sheet

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

How much larger is an A3 sheet compared to an A4 sheet?

An A3 paper sheet is exactly twice as large as an A4 sheet.

What is the ratio of sides in an A3 paper sheet?

The ratio of the longer side to the shorter side in an A3 paper sheet is exactly 1 to √2. Due to this proportion, when folding an A3 sheet in half with the shorter sides together, you obtain a sheet with the same aspect ratio (and dimensions corresponding to an A4 sheet).


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