There are three ranges of paper sizes, prefixed A, B and C. The most widely used for general printing and letterhead
stationery is the A series. The most common of these sheet sizes is the international letterhead size A4, which measures
8-1/4 x 11-3/4 in, or 210 x 297 mm. These paper measurements are defined by the ISO 216 standard.
Standard International Paper Sizes and Measurements
| Paper Size |
Inches |
Millimeters |
Centimeters |
| A0 |
33-1/8 x 46-13/16 in |
841 x 1188 mm |
84.1 x 118.8 cm |
| A1 |
23-3/8 x 33-1/8 in |
59.4 x 84.1 cm |
59.4 x 84.1 cm |
| A2 |
16-1/2 x 23-3/8 in |
420 x 594 mm |
42.0 x 59.4 cm |
| A3 |
11-3/4 x 16-1/2 in |
297 x 420 mm |
29.7 x 42.0 cm |
| A4 |
8-1/4 x 11-3/4 in |
210 x 297 mm |
21.0 x 29.7 cm |
| A5 |
5-7/8 x 8-1/4 in |
148 x 210 mm |
14.8 x 21.0 cm |
| A6 |
4-1/8 x 5-7/8 in |
105 x 148 mm |
10.5 x 14.8 cm |
| A7 |
2-15/16 x 4-1/8 in |
74 x 105 mm |
7.4 x 10.5 cm |
| A8 |
2-1/16 x 2-15/16 in |
52 x 74 mm |
5.2 x 7.4 cm |
Folding Examples:
Standard International Paper Sizes and Measurements
| Size |
Inches |
Millimeters |
Suitable Paper Formats |
| C4 |
12-3/4 x 9 in |
324 x 229 mm |
Flat A4 or A3 folded once |
| C5 |
6-3/8 x 9 in |
162 x 229 mm |
Flat A5, A4 folded once, or A3 folded twice |
| C6 |
4-1/2 x 6-3/8 in |
114 x 162 mm |
Flat A6, A5 folded once, or A4 folded twice |
| C7/6 |
3-1/2 x 6-1/2 in |
89 x 165 mm |
1/3 A4 |
| DL |
4-1/4 x 8-5/8 in |
110 x 220 mm |
A5 folded once or A4 folded twice |
