Metric (mm) paper size guide
Metric sized paper follows an international standard of paper (known in the biz’ as ISO 216) – although not in Canada, the USA, Mexico or the Dominican Republic.
This standard classifies paper into two series – A and B.
Metric paper sizes will mostly all have the same aspect ratio which allows for the paper size to decrease by a metric size when cut or folded in half widthways (with those halves then following the same mathematical rules).
This explains why when you fold an A4 piece of paper in half, it turns into an A5 piece of paper.
Poster sizes standard paper sizes
It’s quite neat really if you’ve ever stopped to appreciate the maths that goes into a piece of paper!
Originally published : Poster size guide
