Paper sizes are categorized into two standards, the
ISO standard and the
North American size standard. ISO standard has A, B
and C series, while NA standard is based on inches.
- "A-series", for general printing
- "B-series", for posters
- "C-series", for envelopes, postcards, and folders
The "A" series is used most commonly with sizes
ranging from A0,which is the largest, down to A8. The A-series sizes
are represented as a part of the area of one square meter with a length
to width ratio of 1.414. Size A0 is equivalent to the area of one
square meter while each smaller size being 50% of the size of the
preceding one. A1 is 50% of the area of A0; A2 is 50% of A1, and so on.
Another way to look at it is that when an A0 sheet cut in half yields
two A1 sheets, and an A1 sheet cut in half yields two A2 sheets.
ISO paper sizes (plus rounded inch values)
| Format |
A series |
B series |
C series |
| Size |
mm × mm |
in × in |
mm × mm |
in × in |
mm × mm |
in × in |
| 0 |
841 × 1189 |
33.11 × 46.81 |
1000 × 1414 |
39.37 × 55.67 |
917 × 1297 |
36.10 × 51.06 |
| 1 |
594 x 841 |
23.39 × 33.11 |
707 × 1000 |
27.83 × 39.37 |
648 × 917 |
25.51 × 36.10 |
| 2 |
420 × 594 |
16.54 × 23.39 |
500 × 707 |
19.69 × 27.83 |
458 × 648 |
18.03 × 25.51 |
| 3 |
297 × 420 |
11.69 × 16.54 |
353 × 500 |
13.90 × 19.69 |
324 × 458 |
12.76 × 18.03 |
| 4 |
210 × 297 |
8.27 × 11.69 |
250 × 353 |
9.84 × 13.90 |
229 × 324 |
9.02 × 12.76 |
| 5 |
148 × 210 |
5.83 × 8.27 |
176 × 250 |
6.93 × 9.84 |
162 × 229 |
6.38 × 9.02 |
| 6 |
105 × 148 |
4.13 × 5.83 |
125 × 176 |
4.92 × 6.93 |
114 × 162 |
4.49 × 6.38 |
| 7 |
74 × 105 |
2.91 × 4.13 |
88 × 125 |
3.46 × 4.92 |
81 × 114 |
3.19 × 4.49 |
| 8 |
52 × 74 |
2.05 × 2.91 |
62 × 88 |
2.44 × 3.46 |
57 × 81 |
2.24 × 3.19 |
| 9 |
37 × 52 |
1.46 × 2.05 |
44 × 62 |
1.73 × 2.44 |
40 × 57 |
1.57 × 2.24 |
| 10 |
26 × 37 |
1.02 × 1.46 |
31 × 44 |
1.22 × 1.73 |
28 × 40 |
1.10 × 1.57 |
The tolerances specified in the standard are
- ±1.5 mm (0.06 in) for dimensions up to 150 mm (5.9 in),
- ±2 mm (0.08 in) for lengths in the range 150 to 600 mm (5.9 to 23.6 in) and
- ±3 mm (0.12 in) for any dimension above 600 mm (23.6 in).
 |
| Dimensions of Paper Sizes |
North American Size Standards
Although the ISO size standards are common in many
parts of the world where the metric system is the established standard
for measurement, North American sheet sizes are based on inches. The
most common size of cut sheet for copier/printers is 8.5”x11” (Letter
Size) that is based on basis size of 17”x22”. (Letter being the quarter
of the size of the 17” x 22”). Other popular sizes are 8.5”x14” (Legal
Size), and 11”x17” (Ledger Size). The other sizes such as 12”x18” and
9”x12” are becoming popular for color applications. These paper sizes
are based on paper sizes used in offset printing.
Engineering paper sizes are also in this category
with sizes such as 9”x12” (A size), 12”x18” (B size), 18”x 24” (C
size), 24”x36” (D), 36”x48” (E size).
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