ISO 217

The ISO 217:2013 standard defines the RA and SRA paper formats.


These paper series are untrimmed raw paper. RA stands for “raw format A” and SRA stands for “supplementary raw format A”. The RA and SRA formats are slightly larger than the corresponding A series formats. This allows bleed (ink to the edge) on printed material that will be later cut down to size. These paper sheets will after printing and binding be cut to match the A format.

  • The ISO A0 format has an area of 1.00 m²
  • The ISO RA0 format has an area of 1.05 m²
  • The ISO SRA0 format has an area of 1.15 m²
RA Series formats SRA Series formats
RA0 860 × 1220 SRA0 900 × 1280
RA1 610 × 860 SRA1 640 × 900
RA2 430 × 610 SRA2 450 × 640
RA3 305 × 430 SRA3 320 × 450
RA4 215 × 305 SRA4 225 × 320


Paper in the RA and SRA series format is intended to have a aspect ratio but the dimensions of the start format have been rounded to whole centimetres.

For example, the RA0 format has been rounded to 860 mm × 1220 mm from the theoretical dimensions .

The resulting real ratios are:

  • for RA0, RA2, RA4;
  • for RA1, RA3;
  • for SRA0, SRA2, SRA4;
  • for SRA1, SRA3.

The sizes of the RA series are also slightly larger than corresponding inch-based US sizes specified in ANSI/ASME Y14.1, e.g. RA4 is roughly equivalent to 8½ in × 12 in and ANSI A (alias US Letter) is defined as 8½ in × 11 in.

Other ISO paper standards

  • ISO 216:1975, defines two series of paper sizes: A and B
  • ISO 269:1985, defines a C series for envelopes

External links

ISO 216

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 269 "C" 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.

List of International Organization for Standardization standards, 1-4999

This is a list of published International Organization for Standardization (ISO) standards and other deliverables. For a complete and up-to-date list of all the ISO standards, see the ISO catalogue.The standards are protected by copyright and most of them must be purchased. However, about 300 of the standards produced by ISO and IEC's Joint Technical Committee 1 (JTC1) have been made freely and publicly available.

List of stationery topics

This is a list of stationery topics. Stationery has historically pertained to a wide gamut of materials: paper and office supplies, writing implements, greeting cards, glue, pencil cases and other similar items.

Paper size

Many paper size standards conventions have existed at different times and in different countries. Today, the A and B series of ISO 216, which includes the commonly used A4 size, are the international standard used by almost every country. However, in many countries in the Americas as well as in the Philippines, the North American series of paper sizes such as 'Letter' and 'Legal' is more prevalent.Paper sizes affect writing paper, stationery, cards, and some printed documents. The international standard for envelopes is the C series of ISO 269


RA3 may refer to:

Command & Conquer: Red Alert 3, a real-time strategy video game

Rocket Arena 3, an unofficial game modification for first-person shooter Quake III: Arena

RA3, an ISO 217 standard paper size

RA3, a file extension for RA3DIO Terrain Information software


SRA may refer to:

The National Center for Biotechnology Information's Sequence Read Archive (previously Short Read Archive)

SRA, a type of semiregular variable star

Satanic ritual abuse

Senior Airman (SrA) in the US Air Force

SRA0 to SRA4 are ISO 217 standard paper sizes

Surveillance radar approach in aviation.

SRA-shooting, Sovellettu reserviläisammunta, Finnish practical shooting sports

Superhuman Registration Act fictitious law in Marvel Comics

Serotonin releasing agent

Stratford station, London, UK, station code

ISO standards by standard number

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