Standardized Paper Sizes

x × y in mm

ISO/EN/DIN formats

Class	A Series		B Series		C Series		D Series		German alternative name (Usage)
4×	1682	2378	2000	2828
2×	1189	1682	1414	2000
0	841	1189	1000	1414	917	1297	771	1090	Vierfachbogen
1	594	841	707	1000	648	917	545	771	Doppelbogen
2	420	594	500	707	458	648	385	545	Bogen
3	297	420	353	500	324	458	272	385	Halbbogen
4	210	297	250	353	229	324	192	272	Viertelbogen (Letter)
5	148	210	176	250	162	229	136	192	Blatt/Achtelbogen (Booklet)
6	105	148	125	176	114	162	96	136	Halbblatt (Postcard)
7	74	105	88	125	81	114	68	96	Viertelblatt (File Card)
8	52	74	62	88	57	81	48	68	Achtelblatt
9	37	52	44	62	40	57	34	48
10	26	37	31	44	28	40	24	34
11	18	26	22	31	20	28	17	24
12	13	18	15	22	14	20	12	17
13	9	13	11	15	10	14	8	12

1/6	210	198							(Sechstelbogen)
lang			110	220					(Business Envelope)

A series are normal paper sizes; B and C series are envelope sizes; D series is very uncommon.

RA Sizes, for work without bleeds, allow 3 mm (1/8") head, foot, and fore-edge trim margins

SRA Sizes, for work with bleeds, allow 3 mm (1/8") head and foot and 6 mm (1/4") fore-edge trim margins

Name	Size (x × y in mm)
1/4 Sheet (portrait or landscape)	420	300
1/2 Sheet (portrait or landscape)	590	420
1/1 Sheet (portrait or landscape)	840	590
2/1 Sheet (portrait or landscape)	1190	840
3/1 Sheet	840	1780
4/1 Sheet (landscape)	1190	1680
4/1 Sheet (portrait)	840	2380
6/1 Sheet	1190	2520
18/1 Large Area Poster	3564	2523
1 part of 4 part partition	1782	1262
1 part of 6 part partition	1188	1262
1 part of 8 part partition	891	1262
1 part of 9 part partition	1188	841
City Light Poster	1200	1760
Advertising Column	3,6 m	2,6 m
Poster World Format (e.g. Switzerland)	905	1280

Maybe these formats are only standardized in Europe or even only in Germany.

They are based on ISO A1, "18/1" means "18 times A1".

Name	Size (x × y in mm)		Used in/for
Berliner Format	315	470	Newspapers
Rheinisches Format	360	530	Newspapers
Nordisches Format	400	570	Newspapers
Tabloid	290	370	Newspapers
Broadsheet	365	600	Newspapers
Broadsheet	380	580	Newspapers
US Letter	216	279	USA, Letters
US Legal	216	356	USA, Contracts
Ledger	432	279	USA, ?
Executive	190	254	USA, ?
10 × 14 "	254	356	USA, ?
11 × 17 "	279	432	USA, also known as A3+ used in medium format ink jet printers
Quart	215	305	?
Quarto	215	275	USA, ?
Oktav	140	210	Books
Statement	140	216	USA, ?
Folio	216	330	USA, ?
Tabloid	279	432	USA, ?
Credit Card	86	54	Business and Credit Cards

Remark: I left the format and country names in their own language/spelling intentionally.

(Deutsches Reich = Imperial Germany; Schweiz = Switzerland) --Hraban, April 2006