![]() There are dozens of envelope sizes for North America, and several different "styles" of envelope relating to the shape, material and strength. This range of larger sizes is typically used by architects and draughtsmen, and seldom used directly by the general public. Also known as Statement, Stationery, Memo, Half Size and Half A. It is close to the ISO A5 size, and is typically used for private letters, invitations, flyers, postcards, small notepads, greetings cards, organizers and diaries. Half Letter is the same as Letter size folded in two. It is close to the ISO A4 size, and is typically used in North America for: Letter size paper is the most commonly used ANSI paper size. Legal size paper is typically used for legal documents, flyers and brochures. Note that Ledger can fold in two to make Letter size. They are both typically used for small posters, flyers, brochures, drawings, diagrams and large tables. Tabloid is "portrait" or vertical, while Ledger is "landscape" or horizontal. Tabloid and Ledger sizes have the same dimensions but a different orientation. The most common ANSI paper sizes are: Tabloid: 11 x 17 in (portrait) / Ledger: 17 x 11 in (landscape) Note that International paper sizes are increasingly available and used in North America. The imperial units are also often converted into metric units-millimetres (mm) and centimetres (cm). The ANSI system is based on imperial units-inches (in or "). The most commonly used North American paper size is Letter (8.5" x 11"). Since 1995, North American sizes have often been prefaced with "ANSI" (American National Standards Institute). Paper sizes in the USA, Canada and Mexico (and the Philippines and Chile) are based on traditional sizes, which are difficult to scale. Over 200 g/m2, it becomes card rather than paper, and can go all the way up to 460 g/m2. ![]() Much lighter, it could be "airmail" paper or even tissue paper. If it's slightly heavier, the quality is probably slightly better (for example 100 g/m2 or 120 g/m2). This is a very standard "weight" for office paper. Typically, photocopy paper is 80 g/m2 (80 grams per square metre) which means that a square metre of the paper weighs 80 grams. This relates to the "weight" of the paper, and the weight of the paper is closely related to its thickness. Regardless of the size system, you may notice markings such as "g/m2" or "gsm" on paper when you buy it. Some Common ISO Envelope Sizes: C Series (+ DL) An additional useful envelope size is the long-format "DL" envelope designed to accommodate A4 paper folded in three. A5 paper (or A4 folded in two) fits neatly into a C5 envelope. Thus A4 paper fits neatly into a C4 envelope. For each A size there is a slightly larger "C" size for envelopes. The International paper system specifies envelope sizes based on the A paper sizes. Sizes smaller than A6 (A7, A8 etc) exist for such things as very small notepads, visiting cards etc. Sizes larger than A3 exist but are rarely used by the general public. It is often used in card form rather than paper, and is the size of many: Note that some items (greetings cards for example) may be A5 in size but actually made from A4 paper folded in two.Ī6 is half the size of A5 and quarter the size of A4. A5: 148 x 210 mmĪ5 paper is half the size of A4. Note that some items (brochures for example) may be A4 in size but actually made from A3 paper folded in two. It is typically used for:Ī4 is the most commonly used International paper size. It is possible to buy A3 photocopy paper, though not all photocopiers/printers can handle it. The most common A paper sizes are: A3: 297 x 410 mmĪ3 paper is quite large. The metric dimensions are also often converted into imperial units-inches (in or "). The International ISO system is based on metric units-millimetres (mm) and centimetres (cm). The important thing is that each A size has the same proportions or "shape": 1 is to the When folded in two, A3 becomes A4, A4 becomes A5, and so on. The eagle-eyed among you will spot a fourth format: A2. This diagram shows three formats from the ISO A series: A3, A4 and A5. The system was developed in Germany in the early 1920s and then spread internationally. International system (ISO)Īlso known as the "A Series" and "ISO 216", the system is such that when folded in two all A sizes retain their proportions, which are 1 to the square root of 2 (1:√2 or approximately 1:1.4). So 8 x 10 is vertical (also known as portrait) and 10 x 8 is horizontal (also known as landscape). Note that paper sizes are measured as width first x height second.
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