A3 Paper Size in Millimetres

The table below displays the paper size of A3 paper in millimetres.

Paper size Width Height
A3 297 mm 420 mm
Ledger 279 mm 432 mm

Ledger size = Canada and the United States of America.
A3 size = The rest of the world (United Kingdom, Australia, Germany, etc).

a3 paper size in millimetres

What are millimetres?

Millimetres are also known as mm and are part of the metric system of measurement.

Millimetres are one tenth of a centimetre and one thousandth of a metre.

Millimetres are most used for measuring small distances.