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Dimensions of C paper sizes | C0,C1,C2,C3,C4,C5,C6,C7,C8,C9,C10

Dimensions of C paper sizes | C0,C1,C2,C3,C4,C5,C6,C7,C8,C9,C10 Paper size
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The C series is usually used for envelopes and is defined in ISO 269. The area of C series sheets is the geometric mean of the areas of the A and B series sheets of the same number; for instance, the area of a C4 sheet is the geometric mean of the areas of an A4 sheet and a B4 sheet. This means that C4 is slightly larger than A4, and slightly smaller than B4. The practical usage of this is that a letter written on A4 paper fits inside a C4 envelope, and both A4 and C4 paper fits inside a B4 envelope.

Some envelope formats with mixed sides from adjacent sizes (and thus an approximate aspect ratio of 2:1) are also defined in national adaptations of the ISO standard, e.g. DIN C6/C5 is 114 mm × 229 mm where the common side to C5 and C6 is 162 mm.

 

 

C Series Paper Sizes From C0 to C10

 

FormatWidth × Height (in)Width × Height (mm)
C036.1 × 51.1 in917 × 1297 mm
C125.5 × 36.1 in648 × 917 mm
C218 × 25.5 in458 × 648 mm
C312.8 × 18 in324 × 458 mm
C49 × 12.8 in229 × 324 mm
C56.4 × 9 in162 × 229 mm
C64.5 × 6.4 in114 × 162 mm
C73.2 × 4.5 in81 × 114 mm
C82.2 × 3.2 in57 × 81 mm
C91.6 × 2.2 in40 × 57 mm
C101.1 × 1.6 in28 × 40 mm

 

 

The dimensions of the C series sizes are defined by the ISO 269 paper size standard. The C series is most commonly used for envelopes. The area of C series paper is the geometric mean of the areas of the A and B series paper of the same number. For example, C4 has a bigger area than A4, but smaller area than B4. Therefore an A4 piece of paper will fit into a C4 envelope. The aspect ratio of C series envelopes is 1:√2, and this means that an A4 sheet of paper when folded in half, parallel to its smaller sides, will fit nicely into a C5 envelope. When it is folded twice, it will fit into a C6 envelope, and so on.

 

 

 

 

ISO paper sizes in portrait view (with rounded inch values)

 

FormatA seriesB seriesC series
Sizemm × mm
in × in
mm × mm
in × in
mm × mm
in × in
0841 × 1189 mm
33.1 × 46.8 in
1000 × 1414 mm
39.4 × 55.7 in
917 × 1297 mm
36.1 × 51.1 in
1594 × 841 mm
23.4 × 33.1 in
707 × 1000 mm
27.8 × 39.4 in
648 × 917 mm
25.5 × 36.1 in
2420 × 594 mm
16.5 × 23.4 in
500 × 707 mm
19.7 × 27.8 in
458 × 648 mm
18.0 × 25.5 in
3297 × 420 mm
11.7 × 16.5 in
353 × 500 mm
13.9 × 19.7 in
324 × 458 mm
12.8 × 18.0 in
4210 × 297 mm
8.27 × 11.7 in
250 × 353 mm
9.84 × 13.9 in
229 × 324 mm
9.02 × 12.8 in
5148 × 210 mm
5.83 × 8.27 in
176 × 250 mm
6.93 × 9.84 in
162 × 229 mm
6.38 × 9.02 in
6105 × 148 mm
4.13 × 5.83 in
125 × 176 mm
4.92 × 6.93 in
114 × 162 mm
4.49 × 6.38 in
774 × 105 mm
2.91 × 4.13 in
88 × 125 mm
3.46 × 4.92 in
81 × 114 mm
3.19 × 4.49 in
852 × 74 mm
2.05 × 2.91 in
62 × 88 mm
2.44 × 3.46 in
57 × 81 mm
2.24 × 3.19 in
937 × 52 mm
1.46 × 2.05 in
44 × 62 mm
1.73 × 2.44 in
40 × 57 mm
1.57 × 2.24 in
1026 × 37 mm
1.02 × 1.46 in
31 × 44 mm
1.22 × 1.73 in
28 × 40 mm
1.10 × 1.57 in

 

 

 

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