# Paper sheet and envelope sizes

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Over time, there have been many conventions of paper sizing. The present-day standards date back to 1975, when the ISO standards regarding paper sizes were issued.

The most popular A-series sizes are based on the findings of Georg Christoph Lichtenberg, a German scientist, who noticed that a rectangle with the √2 side ratio has some unique scaling properties. The basic format, A0, was designed to have the area of 1m2. A1 was achieved by folding the A0 sheet in half across the longer side, A2 is a result of folding A1 in half etc. Each of the subsequent sheets obtained this way has the aspect ratio of √2, too.

A-series paper sizes (especially A4) are common for office use.

 ISO 216 paper size, A series Measurements [mm] A0 841 x 1189 A1 594 x 841 A2 420 x 594 A3 297 x 420 A4 210 x 297 A5 148 x 210 A6 105 x 148 A7 74 x 105 A8 52 x 74 A9 37 x 52 A10 26 x 37

The less popular B-series was designed to be an in-between size for the A-series. For example, B1 is a size between A0 and A1. B-series are used for, e.g., passports and printing press.

 ISO 216 paper size, B series Measurements [mm] B0 1000 x 1414 B1 707 x 1000 B2 500 x 707 B3 353 x 500 B4 250 x 353 B5 176 x 250 B6 125 x 176 B7 88 x 125 B8 62 x 88 B9 44 x 62 B10 31 x 44

C-series (plus and additional format called DL) are used for sizing envelopes:

 C-series; envelope sizes Measurements [mm] DL 110 x 220 C0 917 x 1297 C1 648 x 917 C2 458 x 648 C3 324 x 458 C4 229 x 324 C5 162 x 229 C6 114 x 162 C7 81 x 114 C8 57 x 81 C9 40 x 57 C10 28 x 40

Did you know?

The envelope sizes were designed in such a way that they go well with A- and B-series papers. Taking the most common A4 paper size as an example:

- C4 envelope can fit unfolded A4 sheet of paper
- C5 envelope can fit A4 sheet folded in half
- C6 envelope can fit A4 sheet folded twice (¼ A4 sheet size)
- DL envelope can fit 1/3 A4 sheet

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## Top Discussions

~ hennas 2023-01-19 10:34:23
 i though highland in scotland may have made the list tbh
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