CAD tip # 5255:

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Standard paper size formats.

Standard paper formats are used for printing - the most widely used are the formats A (A0-A10) and B (B0-B10) - and the format line C (envelopes, C0-C10).

The format series "A" (ISO 216, DIN 476, ANSI/ASME Y14.1m-1995) begins on the size A0 with the area of 1m². The aspect ratio of its sides (height/width) is the square root of 2 (ã2, 1.4141).

The sizes of the "B"-line are geometric mean of the same and the nearest higher format of the A line. The sizes of the "C"-line are geometric mean of the same formats from the A- and B-lines.

The sizes of the A- and B-formats (in mm) are following:

Format	A	Format	B
4A0	1682 x 2378	-	-
2A0	1189 x 1682	-	-
A0	841 x 1189	B0	1000 x 1414
A1	594 x 841	B1	707 x 1000
A2	420 x 594	B2	500 x 707
A3	297 x 420	B3	353 x 500
A4	210 x 297	B4	250 x 353
A5	148 x 210	B5	176 x 250
A6	105 x 148	B6	125 x 176
A7	74 x 105	B7	88 x 125
A8	52 x 74	B8	62 x 88
A9	37 x 52	B9	44 x 62
A10	26 x 37	B10	31 x 44

Oversize formats:

Format	A-oversized
A1.0	594 x 1189
A2.0	420 x 1189
A2.1	420 x 841
A3.0	297 x 1189
A3.1	297 x 841
A3.2	297 x 594

In drivers, plotter model names, etc, you can find also the US formats:

Format	Size
E	864 x 1118
D	559 x 864
C	432 x 559
B	279 x 432
A	216 x 279
-
Letter	216 x 279
Legal	216 x 356
Ledger	279 x 432

* HP,PLT

31.10.2006 55054× FAQ

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See also:
Tip 14088:	3 methods of creating true rectangles in AutoCAD.
Tip 13911:	How to print all sheets at once from Inventor?
Tip 13773:	What is the maximum paper size when plotting from AutoCAD?
Tip 13228:	DWG or DXF file exported to/from Fusion 360 has incorrect size (scale, 10x larger/smaller).
Tip 10556:	AutoCAD 2015 and 2016 do not allow to select paper size for Designjet T120/T520.

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