There are many different paper sizes in the world. Currently, the most widespread are the international standard ones, all of the A derivatives, and the North American ones.
The international standard is based on the German one. The base format is 1m² which is called A0. All other sizes are subdivisions of A0. They are formed by halving A0 parallel on its shorter side.
The international standard is almost universal, except in the US and Canada. Although Mexico, Colombia, Chile and the Philippines have adopted the international standard, the US letter format is still commonly used.
Each sheet of A4 weighs 5 grams, if the A0 weighs 80grams per square meter.
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