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The ISO A0 size is defined as having an area of one square meter. Each smaller sheet size is exactly half the area of the previous size

| Designation | Size of sheet | Size of frame | ||
|---|---|---|---|---|
| A mm |
B mm |
C mm |
D mm |
|
| A0 | 841 | 1189 | 791 | 1139 |
| A1 | 594 | 841 | 554 | 804 |
| A2 | 420 | 594 | 380 | 554 |
| A3 | 297 | 420 | 267 | 390 |
| A4 | 210 | 297 | 180 | 267 |
| A5 | 148 | 210 | ||
| A6 | 105 | 148 | ||
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