You know, sometimes you just need a little help with your metrics; we were told that the US would be converted back when I was in the third grade but it never seemed to happen. I’m too old to convert in my head, so here’s a table to help out.
| A Series Formats | B Series Formats | C Series Formats
|
|---|
| 4A0 | 66 1/4 × 93 5/8 | – | – | – | –
|
| 2A0 | 46 3/4 × 66 1/4 | – | – | – | –
|
| A0 | 33 × 46 3/4 | B0 | 39 3/8 × 55 3/4 | C0 | 36 × 51
|
| A1 | 23 3/8 × 33 | B1 | 27 3/4 × 39 3/8 | C1 | 25 1/2 × 36
|
| A2 | 16 1/2 × 23 3/8 | B2 | 19 3/4 × 27 3/4 | C2 | 18 × 25 1/2
|
| A3 | 11 3/4 × 16 1/2 | B3 | 13 7/8 × 19 3/4 | C3 | 12 3/4 × 18
|
| A4 | 8 1/4 × 11 3/4 | B4 | 9 7/8 × 13 7/8 | C4 | 9 × 12 3/4
|
| A5 | 5 7/8 × 8 1/4 | B5 | 7 × 9 7/8 | C5 | 6 3/8 × 9
|
| A6 | 4 1/8 × 5 7/8 | B6 | 4 7/8 × 7 | C6 | 4 1/2 × 6 3/8
|
| A7 | 2 7/8 × 4 1/8 | B7 | 3 1/2 × 4 7/8 | C7 | 3 3/16 × 4 1/2
|
| A8 | 2 × 2 7/8 | B8 | 2 1/2 × 3 1/2 | C8 | 2 1/4 × 3 3/16
|
| A9 | 1 1/2 × 2 | B9 | 1 3/4 × 2 1/2 | C9 | 1 5/8 × 2 1/4
|
| A10 | 1 × 1 1/2 | B10 | 1 1/4 × 1 3/4 | C10 | 1 1/8 × 1 5/8
|