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International Organisation for standardisation (ISO) have recommended standardisation of Paper Sizes to simplify Manufacture, storage and marketing.
ISO Sizes are based on the uniform ratio of the sides of a sheet of paper (viz 1:√2).
There are three series of trimmed sizes designated as A, B, & C series. The basic size from which all other sizes are derived is the size AO(841X1189 mm), the superficial area of which 1 sq.meter. Further Sizes of the A series sre obtained by halving the longer side of the sheet and of the resulting divisions, B & C series are geometrical intermediate forms of the A series.
The basic ISO series of trimmed series are as under:-
A Series - AO = 841 x 1189 mm
B Series - BO = 1000 x 1414 mm
C Series - CO = 917 x 1297 mm
Other sizes of the ISO series are given below, the cipher, which also indicates the number of Central folds, being added to the letter of the series.
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| Designation | Sizes (mm) | Inch Conversion |
| 2AO | 1189 x 1682 | 46.81 x 66.21 |
| A0 | 841 x 1189 | 33.11 x 46.81 |
| A1 | 594 x 841 | 23.39 x 33.11 |
| A2 | 420 x 594 | 16.54 x 23.39 |
| A3 | 297 x 420 | 11.69 x 16.54 |
| A4 | 210 x 297 | 8.27 x 11.69 |
| A5 | 148 x 210 | 5.83 x 8.27 |
| A6 | 105 x 148 | 4.13 x 5.83 |
| A7 | 74 x 105 | 2.91 x 4.13 |
| A8 | 52 x 74 | 2.05 x 2.91 |
| A9 | 37 x 52 | 1.46 x 2.05 |
| A10 | 26 x 37 | 1.02 x 1.46 |
'ISO-B' Series trimmed Sizes
| Designation | Sizes (mm) | Inch Conversion |
| B0 | 1000 x 1414 | 39.73 x 55.67 |
| B1 | 707 x 1000 | 27.83 x 39.37 |
| B2 | 500 x 707 | 19.68 x 27.83 |
| B3 | 353 x 500 | 13.90 x 19.68 |
| B4 | 250 x 353 | 9.84 x 13.90 |
| B5 | 176 x 250 | 6.93 x 9.84 |
| B6 | 125 x 176 | 4.92 x 6.93 |
| B7 | 88 x 125 | 3.46 x 4.92 |
| B8 | 62 x 88 | 2.44 x 3.46 |
| B9 | 44 x 62 | 1.73 x 2.44 |
| B10 | 31 x 44 | 1.22 x 1.73 |
'ISO-C' Series of trimmed Sizes
| Designation | Sizes (mm) | Inch Conversion |
| C0 | 917 x 1297 | 36.10 x 51.06 |
| C1 | 648 x 917 | 25.51 x 36.10 |
| C2 | 458 x 648 | 18.03 x 25.51 |
| C3 | 324 x 458 | 12.76 x 18.03 |
| C4 | 229 x 324 | 9.02 x 12.76 |
| C5 | 162 x 229 | 6.38 x 9.02 |
| C6 | 114 x 162 | 4.49 x 6.38 |
| C7 | 81 x 114 | 3.91 x 4.49 |
| C8 | 57 x 81 | 2.24 x 3.91 |
| C9 | 40 x 57 | 1.57 x 2.24 |
| C10 | 28 x 40 | 1.10 x 1.57 |
Note:-
' A ' series is widely used for general and commercial printed matter.
' B ' series is intended primarily for larger printed items such as posters and wall charts.
' C ' series is used for envelopes, files and folders etc.
Untrimmed Paper Sizes
Dimension of untrimmed Paper sizes are sufficiently larger to allow a trimmed size to be obtained from it as required.
The prefix 'R' signifies Untrimmed sizes from which trimmed sizes may be obtained. The prefix 'SR' signifies sizes that may be trimmed to bleed.
'RA' Series of Untrimmed Stock Sizes
| Reels | Width(mm) | inch Conversion |
| 430 | 16.93 | |
| 610 | 24.02 | |
| 860 | 33.86 | |
| 1220 | 48.03 |
| Sheets | Designation | Size(mm) | inch Conversion |
| RA0 | 860 x 1220 | 33.86 x 48.03 | |
| RA1 | 610 x 860 | 24.02 x 33.86 | |
| RA2 | 430 x 610 | 16.93 x 24.02 |
'SRA' Series of Untrimmed Stock Sizes
| Reels | Width(mm) | inch Conversion |
| 450 | 17.72 | |
| 640 | 25.20 | |
| 900 | 35.43 | |
| 1280 | 50.39 |
| Sheets | Designation | Size(mm) | inch Conversion |
| SRA0 | 900 x 1280 | 35.43 x 50.36 | |
| SRA1 | 640 x 900 | 25.20 x 35.463 | |
| SRA2 | 450 x 640 | 17.72 x 25.20 |