A3 is longer than A4: 420 mm vs 297 mm. The difference is 123 mm, so A3 is about 1.4 times the value of A4.
| Item | Value | Position in ranked list |
|---|---|---|
| A4 | 297 mm | 3 of 7 |
| A3 | 420 mm | 4 of 7 |
Values are approximate and rounded. This comparison comes from the list "paper sizes by length of the long side, shortest first" (7 items, position 1 is first in that order).
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