Keiger Graphic Communications

Keiger Graphic Communications, graphic communications and printing company in Winston-Salem, North Carolina


In the ISO paper size system, the height-to-width ratio of all pages is the square root of two (1.4142 : 1). The current ISO 216 standard was introduced in 1975 and is a direct follow up to the german DIN 476 standard from 1922. The Netherlands have used the DIN/ISO standard since 1925, Belgium since 1924, England (UK) since 1959 and France since 1967. ISO 216 is also called EN 20216 in Europe.


ISO Sizes in Inch Fractions


A Series B Series C Series
4A0 66 1/4 x 93 5/8 - - - -
2A0 46 3/4 x 66 1/4 - - - -
A0 33 X 46 3/4 B0 39 3/8 X 55 3/4 C0 36 X 51
A1 23 3/8 X 33 B1 27 3/4 X 39 3/8 C1 25 1/2 X 36
A2 16 1/2 X 23 3/8 B2 19 3/4 X 27 3/4 C2 18 X 25 1/2
A3 11 3/4 X 16 1/2 B3 13 7/8 X 19 3/4 C3 12/3/4 X 18
A4 8 1/4 X 11 3/4 B4 9 7/8 X 13 7/8 C4 9 X 12 3/4
A5 5 7/8 X 8 1/4 B5 7 X 9 7/8 C5 6 3/8 X 9
A6 4 1/8 X 5 7/8 B6 4 7/8 X 7 C6 4 1/2 X 6 3/8
A7 2 7/8 X 4 1/8 B7 3 1/2 X 4 7/8 C7 3 3/16 X 4 1/2
A8 2 X 2 7/8 B8 2 1/2 X 3 1/2 C8 2 1/4 X 3 3/16
A9 1 1/2 X 2 B9 1 3/4 X 2 1/2 C9 1 5/8 X 2 1/4
A10 1 X 1 1/2 B10 1 1/4 X 1 3/4 C10 1 1/8 X 1 5/8


Application Examples


A0, A1 technical drawings, posters
A1, A2 flip charts
A2, A3 drawings, diagrams, large tables
A4* letters, magazines, forms, catalogs, laser printer and copying machine output
A5 notepads
A6 postcards
B5, A5, B6, A6 books
C4, C5, C6 envelopes for A4 letters: unfolded (C4), folded once (C5), folded twice (C6)
B4, A3 newspapers, supported by most copying machines in addition to  A4
B8, A8 playing cards
*This is the most commonly used format in today's time.
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