Paper Drafting Sizes - ISO 216 series A, B and C
The ISO 216 A, B and C drawing series - dimensions of regular, oversized
and envelope sheets
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ISO 216 "Writing paper and certain classes of printed matter;
Trimmed sizes; A and B series" specifies international standard (ISO)
paper sizes, used in most countries in the world today with three series of
paper sizes: A, B and C. Series C is primarily used for envelopes.
ISO A Series
The ISO A series of sheet sizes is based on a constant
width to length ratio of 1:√2 (rounded to the nearest millimetre). The A0 size
is defined as having an area of one square meter (1 m2). Paper
weights is expressed in grams per square meter.
Each smaller sheet size is exactly half the area of the previous size.
Each smaller sheet size is exactly half the area of the previous size.
|
ISO A Series
|
Size
|
|
|
(mm)
|
(inches)
|
|
|
A0
|
841 x 1189
|
33.11 x 46.81
|
|
A1
|
594 x 841
|
23.39 x 33.1
|
|
A2
|
420 x 594
|
16.54 x 23.29
|
|
A3
|
297 x 420
|
11.69 x 16.54
|
|
A4
|
210 x 297
|
8.27 x 11.69
|
|
A5
|
148 x 210
|
5.83 x 8.27
|
ISO 216 does not define sizes larger than A0 or B0. With the
German standard DIN 476 "Trimmed sizes of paper" the sizes can be
expanded by using a factor in front of the size:
·
2A0
is twice the size of A0
·
4A0
is four time the size of A0
Oversized ISO A Sheets
Oversized sheets are used when it is desirable to give
extra protection to the drawing sheets by providing a binding or trimming
margin.
|
ISO A Series
|
Size
(mm) |
|
RA0
|
860 x 1220
|
|
RA1
|
610 x 860
|
|
RA2
|
430 x 610
|
|
RA3
|
305 x 430
|
|
RA4
|
215 x 305
|
|
RA5
|
153 x 215
|
ISO B Series
The ISO B series are geometric means between the A series
and defined to satisfy the requirements of sizes between the A series sizes.
For example, B1 is a geometric mean between A1 and A0.
|
ISO B Series
|
Size
|
|
|
(mm)
|
(inches)
|
|
|
B0
|
1000 x 1414
|
39.37 x 55.67
|
|
B1
|
707 x 1000
|
27.83 x 39.37
|
|
B2
|
500 x 707
|
19.68 x 27.83
|
|
B3
|
353 x 500
|
13.90 x 19.68
|
|
B4
|
250 x 353
|
9.84 x 13.90
|
|
B5
|
176 x 250
|
6.93 x 9.84
|
ISO C Series - Envelopes
Series C is primarily used for envelopes. The C series
formats are geometric means between the B series format with the same number
and the A series format with the same number - C2 is the geometric mean between
B2 and A2.
|
ISO C Series
Envelopes |
Size
|
|
|
(mm)
|
(inches)
|
|
|
C0
|
917 x 1297
|
36.00 x 51.20
|
|
C1
|
648 x 917
|
25.60 x 36.00
|
|
C2
|
458 x 648
|
18.00 x 25.60
|
|
C3
|
324 x 458
|
12.80 x 18.00
|
|
C4
|
229 x 324
|
9.00 x 12.80
|
|
C5
|
162 x 229
|
6.40 x 9.0
|
An A4 page will fit into a C4 envelope, A5 will fit into a
C5 envelope and so on.
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