A series paper sizes (A0 to A10)

The A series is the international paper standard, ISO 216 (also known as DIN 476 in Germany). Each size is half of the one before it, and all of them share the 1 : √2 shape.

A series paper sizes (A0 to A10)
Size	mm	cm	inches	px at 300 dpi
A0	841 × 1189	84.1 × 118.9	33.11 × 46.81	9933 × 14043
A1	594 × 841	59.4 × 84.1	23.39 × 33.11	7016 × 9933
A2	420 × 594	42 × 59.4	16.54 × 23.39	4961 × 7016
A3	297 × 420	29.7 × 42	11.69 × 16.54	3508 × 4961
A4	210 × 297	21 × 29.7	8.27 × 11.69	2480 × 3508
A5	148 × 210	14.8 × 21	5.83 × 8.27	1748 × 2480
A6	105 × 148	10.5 × 14.8	4.13 × 5.83	1240 × 1748
A7	74 × 105	7.4 × 10.5	2.91 × 4.13	874 × 1240
A8	52 × 74	5.2 × 7.4	2.05 × 2.91	614 × 874
A9	37 × 52	3.7 × 5.2	1.46 × 2.05	437 × 614
A10	26 × 37	2.6 × 3.7	1.02 × 1.46	307 × 437

Drawn to the same scale.

What A series is used for

A0–A2: posters and plans
A3: drawings and spreadsheets
A4: documents and printer paper
A5–A6: notebooks, flyers, postcards
A7–A8: tickets, labels, pocket cards

The halving rule

Fold any A sheet in half across its long side and you get the next size, with the same proportions. That is why an A4 page scales to A5 (71%) or A3 (141%) with nothing cropped.

Questions

What is the difference between A4, A5 and A6?

A4 is 210 × 297 mm, A5 is half of it (148 × 210 mm) and A6 is a quarter (105 × 148 mm).

How big is A7?

74 × 105 mm (2.91 × 4.13 in). A8 is 52 × 74 mm.