c series-paper-sizes Table of C Series Paper Sizes (C0, C1, C2, C3, C4, C5, C6, C7, C8, C9, C10)

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Here is a Table of The C Series Paper Sizes, These include C0, C1, C2, C3, C4, C5, C6, C7, C8, C9, and C10. Standard Dimensions or Length and Width of Paper in C Series in unit of measurements in mm (millimeter), cm (centimeter), and inch (inches).

C Sizes mm cm inches
C0 917 × 1297 91.7 × 129.7 36.1 × 51.1
C1 648 × 917 64.8 × 91.7 25.5 × 36.1
C2 458 × 648 45.8 × 64.8 18.0 × 25.5
C3 324 × 458 32.4 × 45.8 12.8 × 18.0
C4 229 × 324 22.9 × 32.4 9.02 × 12.8
C5 162 × 229 16.2 × 22.9 6.38 × 9.02
C6 114 × 162 11.4 × 16.2 4.49 × 6.38
C7 81 × 114 8.1 × 11.4 3.19 × 4.49
C8 57 × 81 5.7 × 8.1 2.24 × 3.19
C9 40 × 57 4.0 × 5.7 1.57 × 2.24
C10 28 × 40 2.8 × 4.0 1.10 × 1.57

International Standard

ISO specifies international standard (ISO) paper sizes used in most countries in the world today, although not in Canada, the United States, Mexico, Colombia, or the Dominican Republic. The standard defines the “A” , “B” and “C” series of paper sizes, including A4, the most commonly available paper size worldwide.


The tolerances specified in the standard are:

  • ±1.5 mm for dimensions up to 150 mm,
  • ±2.0 mm for dimensions in the range 150 to 600 mm, and
  • ±3.0 mm for dimensions above 600 mm.

These are related to comparison between series A, B and C.

The C series is usually used for envelopes and is defined in ISO 269. The area of C series papers is the geometric mean of the areas of the A and B series papers of the same number, for instance, the area of a C4 paper is the geometric mean of the areas of an A4 paper and a B4 paper. 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.

Unit of measurement

Unit of measurement is a definite magnitude of a value, defined and adopted by convention that is used as a standard for measurement of the same kind of value. Any other quantity of that kind can be expressed as a multiple of the unit of measurement.

mm (millimeter)

mm stands for millimeter (American spelling) or millimetre (SI spelling) is the size of the unit of length in the metric system, that is the basis of the length measurement. 1 mm is equal to 0.1 cm.

cm (centimeter)

cm stand for centimetre (international spelling as used by the International Bureau of Weights and Measures) or centimeter (American spelling) is a unit of length in the metric system, equal to one hundredth of a meter. cm being the International System of Units prefix for a factor of one per a hundred. cm is the base unit of length for cgs (centimetre–gram–second) system of units.


Inch (plural: inches, abbreviation: in or ″) is a unit of length in the imperial and United States customary systems of measurement, now formally equal to one per thirty six yard but usually understood as one per twelve of a foot. Derived from the Roman uncia, “inch” is also sometimes used to translate related units in other measurement systems. Traditional standards for the exact length of an inch have varied in the past, but since the adoption of the international yard during the 1950s and 1960s it has been based on the metric system and reckoned as exactly 2.54 cm.

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