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Message: <blockquote data-quote="spiely" data-source="post: 35625" data-attributes="member: 145">ISO 216 defines the A series of paper sizes as follows: The height divided by the width of all formats is the square root of two (1.4142). Format A0 has an area of one square meter. Format A1 is A0 cut into two equal pieces, i.e. A1 is as high as A0 is wide and A1 is half as wide as A0 is high. All smaller A series formats are defined in the same way by cutting the next larger format in the series parallel to its shorter side into two equal pieces. The standardized height and width of the paper formats is a rounded number of millimeters. For applications where the ISO A series does not provide an adequate format, the B series has been introduced to cover a wider range of paper sizes. The C series of formats has been defined for envelopes. The width and height of a B series format is the geometric mean between the corresponding A format and the next larger A format. For instance, B1 is the geometric mean between A1 and A0, that means the magnification factor that scales A1 to B1 also scales B1 to A0. Similarly, the formats of the C series are the geometric mean between the A and B series formats with the same number. For example, an A4 size letter fits nicely into a C4 envelope, which in turn fits as nicely into a B4 envelope. If you fold this letter once to A5 format, then it will fit nicely into a C5 envelope. [The Japanese JIS P 0138-61 standard defines the same A series as ISO 216, but a slightly different B series of paper sizes, sometimes called the JIS B or JB series. JIS B0 has an area of 1.5 m², such that the area of JIS B pages is the arithmetic mean of the area of the A series pages with the same and the next higher number, and not as in the ISO B series the geometric mean. For example JB3 is 364 × 515, JB4 is 257 × 364, and JB5 is 182 × 257 mm. Using the JIS B series should be avoided because it introduces additional magnification factors and is not an international standard.] The following table shows the width and height of all ISO A and B paper formats, as well as the ISO C envelope formats. The dimensions are in millimeters:A Series Formats  B Series Formats  C Series Formats  4A0 1682 × 2378  - -  - -  2A0 1189 × 1682  - -  - -  A0 841 × 1189  B0 1000 × 1414  C0 917 × 1297  A1 594 × 841   B1 707 × 1000  C1 648 × 917  A2 420 × 594   B2 500 × 707   C2 458 × 648  A3 297 × 420   B3 353 × 500   C3 324 × 458  A4 210 × 297  B4 250 × 353  C4 229 × 324  A5 148 × 210   B5 176 × 250   C5 162 × 229  A6 105 × 148   B6 125 × 176   C6 114 × 162  A7 74 × 105   B7 88 × 125   C7 81 × 114  A8 52 × 74   B8 62 × 88   C8 57 × 81  A9 37 × 52   B9 44 × 62   C9 40 × 57  A10 26 × 37   B10 31 × 44   C10 28 × 40 So A4 is 210mm by 297mmhope this helpsspiely..................... </blockquote>

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