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ISO paper sizes

This entry is part 5 of 10 in the series Design Techniques & Terminology

The fifth of Bournemouth-based branding agency CuCo Creative’s technical/terminology articles.

Over time there have been many standard sizes of paper used across the world, but today these have been distilled down to just two, ISO 216 (A4, A3 etc) and the North American sizes officially only still used in the USA and Canada.

ISO 216 evolved from the German DIN 476 standard for paper sizes. and these are based in a single aspect ratio of square root of two. The base format is a sheet of paper measuring 1m² in area (A0 paper size). Successive paper sizes in the series – A1, A2, A3, and so forth – are defined by halving the preceding paper size along the larger dimension; therefore if you cut an A0 sheet in half you get two sheets of A1, and so on. This aspect ratio is especially convenient for a paper size, as each size has the same width/height ratio, which allows the easy scaling of work.

ISO sizes A series

There are various series of sizes: A, B & C. The A series is used as the standard paper sizes for finished work in print, ie the size the final product is cut down to. The most frequently used of this series is A4, which is 210mm × 297mm.

Application examples:
A0, A1: technical drawings, posters
A2, A3: drawings, diagrams, large tables
A4: letters, magazines, forms, catalogues, laser printer and photocopying machines
A5: note pads
A6: postcards

ISO codeSize in millimetresSize in inchesSize in points
4A01582 x 237866.22 x 93.624768 x 6741
2A01189 x 168246.81 x 66.223370 x 4768
A0841 x 118933 x 46.812384 x 3370
A1594 x 84123.39 x 331684 x 2384
A2420 x 59416.54 x 23.361191 x 1684
A3297 x 42011.69 x 16.54842 x 1191
A4210 x 2978.27 x 11.69595 x 842
A5148 x 2105.83 x 8.27420 x 595
A6105 x 1484.13 x 5.83298 x 420
A774 x 1052.91 x 4.13210 x 298
A852 x 742.05 x 2.91147 x 210
A937 x 521.46 x 2.05105 x 147
A1026 x 371.02 x 1.4674 x 105

ISO sizes B series

The B series formats are geometric means between the A series format with the same number and the A series format with one lower number. For example, B1 is a geometric mean between A1 and A0. The B series is less common in office use, but it is used for a variety of special situations. Many posters use B-series paper, B5 is a relatively common choice for books and the B series is also used for envelopes and passports. Most print starts life on a B sized sheet; this allows for bleed, crop/registration marks, colour bars and other notes printed in the margins before it is trimmed to size.

Application examples:
B5,A5, B6,A6: books
B4/A3: newspapers, supported by most copying machines in addition to A4

ISO codeSize in millimetresSize in inchesSize in points
B01000 x 141433.37 x 55.672836 x 4008
B1707 x 100027.84 x 39.372004 x 2835
B2500 x 70719.69 x 27.841417 x 2004
B3353 x 50013.9 x 19.691001 x 1417
B4250 x 3529.84 x 13.9709 x 1001
B5176 x 2506.93 x 9.84499 x 709
B6125 x 1764.92 x 6.93354 x 499
B788 x 1253.47 x 4.92249 x 354
B862 x 882.44 x 3.47176 x 249
B944 x 621.73 x 2.44125 x 176
B1031 x 441.22 x 1.7388 x 125

ISO sizes C series

The C series format was designed for use as envelope sizes, which are designed for use with ISO 216 standard paper sizes (the A series). Metric measurements are the finished envelope size. Inch measurements are approximate. Thus an unfolded A4 sheet or a A3 sheet folded in half will fit into a C4 envelope.

NameSize in millimetresSize in inches
C0917 x 129736.12 x 51.6
C1648 x 91725.50 x 36.12
C2458 x 64818 x 25.50
C3324 x 45812.75 x 18
C4229 x 3249 x 12.75
C5162 x 2296.38 x 9
C6114 x 1624.5 x 6.38
C7/681 x 1623.19 x 6.38
C781 x 1143.19 x 4.5
DL110 x 2204.32 x 8.69

The C6/7 will fit an A5 sheet folded in thirds, the A7 will fit an A5 folded in quarters – though neither of these sizes are used often. Although DL is not part of the ISO C series, it is a very widely deployed standard size and is used to fit an A4 sheet folded in thirds or an A5 in half.

Untrimmed sheets

The ISO 217:1995 standard defines the RA (raw format A) and SRA (supplementary raw format A) formats for untrimmed raw paper. These formats are only slightly larger than the corresponding A formats. Sheets in these formats are cut to the final size format after printing and binding.

ISO press-sheet RA sizes

Press-sheet nameSize in millimetresSize in inches
RA0860 x 122033 7/8 x 48
RA1610 x 86024 x 33 7/8
RA2430 x 6106 15/16 x 24
RA3305 x 43012 x 16 15/16
RA4215 x 3058 7/16 x 12

ISO press-sheet SRA sizes

Press-sheet nameSize in millimetresSize in inches
SRA0900 x 128035 7/16 x 50 3/8
SRA1640 x 90025 3/16 x 35 7/16
SRA2450 x 64017 11/16 x 25 3/16
SRA2320 x 45012 5/8 x 17 11/16
SRA4225 x 3208 7/8 x 12 5/8

If you are seeking print management services, contact Poole-based branding and web design agency CuCo on 01202 911959 or email us at hello@cucocreative.co.uk

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