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.

Explore Neenah's extensive selection of quality paper and envelopes to find the right fit for your mailing needs.

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: