Strona główna Items The dimensions of a sheet of A3 paper

# The dimensions of a sheet of A3 paper

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

## A3 size sheet

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

## How much larger is an A3 sheet than A4?

A sheet of A3 paper is exactly twice the size of an A4 sheet.

## What is the ratio of the sides in a sheet of A3 paper?

The length of the long side to the short side on a sheet of A3 paper is exactly 1 to √2. Thanks to this distribution of proportions, after folding an A3 sheet in half, with the shorter sides to each other, we will get a sheet of paper with the same ratio of the sides’ length (by the way, with dimensions corresponding to the A4 format).

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