International Paper Sizes

 

ISO A-sizes

The A-sizes are a logical set of paper sizes. The largest size (A0) measures one square meter. The height/width ratio remains constant (1:1.41) for all sizes. This means you get the A1 size by folding an A0 paper in two. Then fold the A1 size in two to get an A2 size paper, and so on... A-sizes are used to define the finished paper size in commercial printing. A4 is used for office documents. A6 is used for postcards.

 
Millimetres
Inches
Points
 
Height
Width
Height
Width
Height
Width
A0
1189
841
46.81
33.11
3370
2384
A1
841
594
33.11
23.39
2384
1684
A2
594
420
23.39
16.54
1684
1190
A3
420
297
16.54
11.69
1190
842
A4
297
210
11.69
8.27
842
595
A5
210
148
8.27
5.83
595
420
A6
148
105
5.83
4.13
420
298
A7
105
74
4.13
2.91
298
209

ISO B-sizes

The same logic from the A-sizes also applies for the B-series, except here the starting point was the dimension of one of the sides, which starts at 1 meter. B-sizes are often used for posters.

 
Millimetres
Inches
Points
 
Height
Width
Height
Width
Height
Width
B0
1414
1000
55.67
39.37
4008
2835
B1
1000
707
39.37
27.83
2835
2004
B2
707
500
27.83
19.69.
2004
1417
B3
500
353
19.69
13.90
1417
1001
B4
353
250
13.90
9.84
1001
709
B5
250
176
9.84
6.93
709
499
B6
176
125
6.93
4.92
499
354
B7
125
88
4.92
3.46
354
249
B8
88
62
3.46
2.44
249
176
B9
62
44
2.44
1.73
176
125
B10
44
31
1.73
1.22
125
88

 
American paper sizes
 
 

As far as I know, a lot of businesses in the US still rely on the paper sizes below that come with nice names but no apparent logic behind them. In England a similar system was used but they have already seen the light and switched to the A-sizes.

 
Millimetres
Inches
Points
 
Height
Width
Height
Width
Height
Width
Letter
279.4
215.9
11.00
8.50
792
612
Legal
355.6
215.9
14.00
8.50
1008
612
Ledger
431.8
279.4
17.00
11.00
1224
792
Tabloid
279.4
431.8
11.00
17.00
792
1224
Executive
266.7
184.1
10.55
7.25
756
522

 

 

ISO C-sizes

C-sizes are used for envelopes to match the A-series paper. I have omitted unrealistic sizes like C0 (imagine an envelope measuring 917 by 1297 millimetres).

 
Millimetres
Inches
Points
 
Height
Width
Height
Width
Height
Width
C2
458
648
18.03
25.51
578
1837
C3
324
458
12.76
18.03
919
578
C4
229
324
9.02
12.76
649
919
C5
162
229
6.38
9.02
459
649
C6
114
162
4.49
6.38
323
459

 
ISO D-sizes
 
 

I have no idea what D-sizes are used for but the standard is there so it should be mentioned.

 
Millimetres
Inches
Points
 
Height
Width
Height
Width
Height
Width
D0
771
1090
30.35
42.91
2186
3090

 

 

ISO RA & SRA sizes 

 

These oversized papersizes are used by printers. The dimensions in millimetres are rounded to the nearest value.

 
Millimetres
Inches
Points
 
Height
Width
Height
Width
Height
Width
SRA0
900
1280
35.43
50.39
2551
3628
SRA1
640
900
25.20
35.43
1814
2551
SRA2
450
640
17.72
25.20
1276
1814
SRA3
320
450
12.59?
17.72
907?
1276
SRA4
225
320
8.86?
12.59?
638?
907?
RA0
860
1220
33.86
48.03
2438
3458
RA1
610
860
24.02
33.86
1729
2438
RA2
430
610
16.93
24.02
1219
1729

 
 
English paper sizes (writing papers)
 
 

I have no idea whether these definitions are still in use today.

 
Millimetres
Inches
Points
 
Height
Width
Height
Width
Height
Width
Foolscap
419
336
16.50
13.25
1188
954
Small Post
469
368
18.50
14.50
1332
1044
Sheet and 1/3 cap
588
336
22.00
13.25
1584
954
Sheet and 1/2 cap
628
336
24.75
13.25
1782
954
Demy
507
394
20.00
15.50
1440
1116
Large Post
533
419
21.00
16.50
1512
1188
Small medium
558
444
22.00
17.50
1584
1260
Medium
584
457
23.00
18.00
1656
1296
Small Royal
609
482
24.00
19.00
1728
1368
Royal
634
507
25.00
20.00
1800
1440
Imperial
761
559
30.00
22.00
2160
1584

 

 

© 2000 L. Leurs