International Sizes

Detailed Measurements for International Paper Sizes & Envelopes.

There are three ranges of sizes, prefixed A, B and C. The most widely used for general printing and letterhead stationery is the A series. The international letterhead size is an A4.

Standard International Paper Sizes

Size	Inches	Millimeters
A0	33-1/8 x 46-13/16	841 x 1188
A1	23-3/8 x 33-1/8	549 x 841
A2	16-1/2 x 23-3/8	420 x 594
A3	11-3/4 x 16-1/2	297 x 420
A4	8-1/4 x 11-3/4	210 x 297
A5	5-7/8 x 8-1/4	148 x 210
A6	4-1/8 x 5-7/8	105 x 148
A7	2-15/16 x 4-1/8	74 x 105
A8	2-1/16 x 2-15/16	52 x 74

Standard International Envelope Sizes

Size	Inches	Millimeters	Suitable Paper Formats
C4	12-3/4 x 9	324 x 229	Flat A4 or A3 folded once
C5	6-3/8 x 9	162 x 229	Flat A5, A4 folded once, or A3 folded twice
C6	4-1/2 x 6-3/8	114 x 162	Flat A6, A5 folded once, or A4 folded twice
C7/6	3-1/2 x 6-1/2	89 x 165	1/3 A4
DL	4-1/4 x 8-5/8	110 x 220	A5 folded once or A4 folded twice

Example: