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All about paper sizing

All about paper sizing

ISO 216 specifies international standard (ISO) paper sizes used in most countries in the world today, although not in Canada, the United States, Mexico, Colombia, or the Dominican Republic. The standard defines the “A” and “B” series of paper sizes, including A4, the most commonly available paper size worldwide. Two supplementary standards, ISO 217 and ISO 269, define related paper sizes; the ISO 269C” series is commonly listed alongside the A and B sizes.

All ISO 216, ISO 217 and ISO 269 paper sizes (except some envelopes) have the same aspect ratio, √2:1, within rounding to millimetres. This ratio has the unique property that when cut or folded in half widthways, the halves also have the same aspect ratio. Each ISO paper size is one half of the area of the next larger size in the same series.

 

SizeA series formatsB series formatsC series formats
mminchesmminchesmminches
0841 × 118933.1 × 46.81000 × 141439.4 × 55.7917 × 129736.1 × 51.1
1594 × 84123.4 × 33.1707 × 100027.8 × 39.4648 × 91725.5 × 36.1
2420 × 59416.5 × 23.4500 × 70719.7 × 27.8458 × 64818.0 × 25.5
3297 × 42011.7 × 16.5353 × 50013.9 × 19.7324 × 45812.8 × 18.0
4210 × 2978.3 × 11.7250 × 3539.8 × 13.9229 × 3249.0 × 12.8
5148 × 2105.8 × 8.3176 × 2506.9 × 9.8162 × 2296.4 × 9.0
6105 × 1484.1 × 5.8125 × 1764.9 × 6.9114 × 1624.5 × 6.4
774 × 1052.9 × 4.188 × 1253.5 × 4.981 × 1143.2 × 4.5
852 × 742.0 × 2.962 × 882.4 × 3.557 × 812.2 × 3.2
937 × 521.5 × 2.044 × 621.7 × 2.440 × 571.6 × 2.2
1026 × 371.0 × 1.531 × 441.2 × 1.728 × 401.1 × 1.6

 

Letter or ANSI Letter is a paper size commonly used as home or office stationery in the United States, Canada, Chile, Mexico, Panama, the Dominican Republic and the Philippines. It measures 8.5 by 11 inches (215.9 by 279.4 mm). US Letter-size paper is a standard defined by the American National Standards Institute (ANSI, paper size A), in contrast to A4 paper used by most other countries, and adopted at varying dates, which is defined by the International Organization for Standardization, specifically in ISO 216.

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