A4 paper

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A4 paper

The common letter-sized paper used in Europe and in most locations outside of North America. At 8.3 x 11.7" (210x297mm), A4 paper is slightly narrower and a little longer than "A" size 8.5 x 11" paper (216x279mm).

The A Series
The A4 is part of the ISO "A Series," where A0, the first dimension, equals almost one square meter (841x1189mm = 999,949 square mm). Starting with A1, each size is one half the square surface area of the previous size while maintaining the same aspect ratio. For more sizes, see engineering drawing sizes.

Paper Substitution
Most printers default to scaling incoming documents between A4 and A paper sizes so they can be printed on the prevailing paper stock. If "paper substitution" is not set, the printer will attempt to ensure that the paper size matches the document size.
References in periodicals archive ?
Approximately 72 380 000 sheets din a4 +/- 2.0 mm (according to din en iso 216).
Hoy en dia el papel industrial cortado en pliegos estandarizados suelen respetar cuatro numeros irracionales importantes: [pi] (3.114159 ...) que relaciona la circunferencia del circulo con su diametro, [phi] (1.61803 ...) que representa la seccion aurea, e (2.71828 ...) que es la base de los logaritmos naturales, y [square root or 2] (1.41421 ...) que es la proporcion que da principio al tamano de pliego ISO 216.
The presses will have a material width of 29, the equivalent of B2 width under ISO 216. It is expected that these presses will have a price tag north of $1 million, possibly around $1.5 million.
Approximately 74 650 000 sheets din a4 +/- 2 mm (according to din en iso 216)
85.6 million sheets of A4 +/- 2.0 mm (according to DIN EN ISO 216) .