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
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