Paper Sizes Here is list of all page sizes
Sizes Of A Series Paper Sizes
The dimensions of the A series paper sizes, as defined by ISO 216, are given in the table below in both millimeters and inches (cm measurements can be obtained by dividing mm value by 10). The A Series paper size chart to the right gives a visual explanation of how the sizes relate to each other  for example, A5 is half of A4 size paper and A2 is half of A1 size paper.
The A series paper sizes are now in common use throughout the world apart from in the US, Canada and parts of Mexico. The A4 size has become the standard business letter size in English speaking countries such as Australia, New Zealand and the UK that used to use British Imperial sizes. In Europe, the A paper sizes were adopted as the formal standard in the mid 20th century and from there they spread across the globe.
Table of Paper Sizes From 4A0 to A10
A Series Paper Sizes Chart. 
Size  Height x Width (mm)  Height x Width (in) 
4A0  2378 x 1682 mm  93.6 x 66.2 in 
2A0  1682 x 1189 mm  66.2 x 46.8 in 
A0  1189 x 841 mm  46.8 x 33.1 in 
A1  841 x 594 mm  33.1 x 23.4 in 
A2  594 x 420 mm  23.4 x 16.5 in 
A3  420 x 297 mm  16.5 x 11.7 in 
A4  297 x 210 mm  11.7 x 8.3 in 
A5  210 x 148 mm  8.3 x 5.8 in 
A6  148 x 105 mm  5.8 x 4.1 in 
A7  105 x 74 mm  4.1 x. 2.9 in 
A8  74 x 52 mm  2.9 x 2.0 in 
A9  52 x 37 mm  2.0 x 1.5 in 
A10  37 x 26 mm  1.5 x 1.0 in 
Table of Envelope Sizes From C0 to C10
C Series Envelope Sizes Chart. 
Size  Height x Width (mm)  Height x Width (in) 
C0  1297 x 917 mm  51.5 x 36.1 in 
C1  917 x 648 mm  36.1 x 25.5 in 
C2  648 x 458 mm  25.5 x 18.0 in 
C3  458 x 324 mm  18.0 x 12.8 in 
C4  324 x 229 mm  12.8 x 9.0 in 
C5  229 x 162 mm  9.0 x 6.4 in 
C6  162 x 114 mm  6.4 x 4.5 in 
C7  114 x 81 mm  4.5 x. 3.2 in 
C8  81 x 57 mm  3.2 x 2.2 in 
C9  57 x 40 mm  2.2 x 1.6 in 
C10  40 x 28 mm  1.6 x 1.1 in 
C Series Envelope Size Definitions
C envelopes sizes are defined as the geometric mean of the A and B sizes with the same number i.e. C4 dimensions are the geometric mean of A4 and B4. This produces a size between the two that makes an envelope that will neatly hold the A series paper of the same size, thus a C4 envelope is perfect for an A4 sheet of paper unfolded.It should be noted that C format envelopes also have an aspect ratio of 1:root2 and because of this an A4 sheet folded parallel to its shortest sides will fit in a C5 envelope and folded twice will fit a C6 envelope.
The following diagrams show C4, C5 and C6 envelopes compared to A4 paper size (the envelope being shown in brown with the paper shown as grey) as can be seen in the first diagram the C4 envelope can contain an A4 sheet, the C5 envelope can contain an A4 sheet folded in half (an A5 sheet) and the C6 envelope can contain an A4 sheet folded in half twice (an A6 sheet). This is the reason that you will sometimes see these envelope sizes being referred to as A4 envelope size, A5 envelope size and A6 envelope size.
C4 Envelope 
C5 Envelope 
C6 Envelope 
DL Envelope
The dimensions of the B series paper sizes, as defined by ISO 216, are given in the table below in both millimeters and inches (cm measurements can be obtained by dividing the mm value by 10). The B Series paper size chart to the right is a visual explanation of how the B paper sizes relate to each other.
B Series Paper Sizes Chart. 
Size  Height x Width (mm)  Height x Width (in) 
B0  1414 x 1000 mm  55.7 x 39.4 in 
B1  1000 x 707 mm  39.4 x 27.8 in 
B2  707 x 500 mm  27.8 x 19.7 in 
B3  500 x 353 mm  19.7 x 13.9 in 
B4  353 x 250 mm  13.9 x 9.8 in 
B5  250 x 176 mm  9.8 x 6.9 in 
B6  176 x 125 mm  6.9 x 4.9 in 
B7  125 x 88 mm  4.9 x. 3.5 in 
B8  88 x 62 mm  3.5 x 2.4 in 
B9  62 x 44 mm  2.4 x 1.7 in 
B10  44 x 31 mm  1.7 x 1.2 in 
B Series Paper Size Tolerances
ISO 216 specifies tolerances for the production of B series paper sizes in the same way as for A series paper sizes, the specific details of which are as follows:

1.5 mm (0.06 in) for dimensions up to 150 mm (5.9 in)

2 mm (0.08 in) for lengths in the range 150 to 600 mm (5.9 to 23.6 in)

3 mm (0.12 in) for any dimension above 600 mm (23.6 in)
B Series Paper Sizes Definition
The B series paper sizes are defined in ISO 216 in the following way.
The B series paper sizes were created in order to provide paper sizes that weren't covered by the A series, but also use an aspect ratio of 1:root2. B sizes are defined as size B(n) being the geometric mean of size A(n) and size A(n1). The
Geometric Means of 2 numbers being the square root of the product of the two numbers.
This system gives a useful property for enlarging and reducing documents in that the enlargement from A(n) to B(n) is the same as that from B(n) to A(n1).
As with the A series paper the standard lengths and widths are rounded to the nearest millimetre.