A SERIES	mm × mm	Inch × Inch	B SERIES	mm × mm	Inch × Inch
A0	841 × 1189	33.11 × 46.81	B0	1000 × 1414	39.37 × 55.67
A1	594 × 841	23.39 × 33.11	B1	707 × 1000	27.83× 39.37
A2	420 × 594	16.54 × 23.39	B2	500 × 707	19.68 × 27.83
A3	297 × 420	11.69 × 16.54	B3	353 × 500	13.90 × 19.68
A4	210 × 297	8.27 × 11.69	B4	250 × 353	9.84 × 13.90
A5	148 × 210	5.83 × 8.27	B5	176 × 250	6.93 × 9.84
A6	105 × 148	4.13 × 5.83	B6	125 × 176	4.92 × 6.93
A7	74 × 105	2.91 × 4.13	B7	88 × 125	3.46 × 4.92
A8	52 × 74	2.05 × 2.91	B8	62 × 88	2.44 × 3.46
A9	37 × 52	1.46 × 2.05	B9	44 × 62	1.73 × 2.44
A10	26 × 37	1.02 × 1.46	B10	31 × 44	1.22 × 1.73

Area of A0 = 1 Square meter
A0/A1 = AI/A2 = A2/A3 ...........A9/A10 = 2
Length = 1.414 * Width

Width of An = 2^(-1/4-n/2) and Height = 2^(1/4-n/2)

Area of B0 = 1.414 Square meter
B0/B1 = B1/B2 = B2/B3 ............B9/B10 = 2
B0/A0 = B1/A1 = B2/A2 ..........B10/A10

Width of Bn = 2^(-n/2) and Height = 2^(1/2-n/2)

The C series is used for folders, post cards and envelopes. C series envelope is suitable to insert A series sizes.

C SERIES	mm × mm	Inch × Inch	Japanese B Series	mm × mm	Inch × Inch
C0	917×1297	36.10×51.06	B0	1030 x 1456	40.55x57.32
C1	648×917	25.53×36.10	B1	728 x 1030	28.66x40.55
C2	458×648	18.05×25.53	B2	515x728	20.27x28.66
C3	324×458	12.76×18.05	B3	364x515	14.33x20.27
C4	229×324	9.02×12.76	B4	257x364	10.13x14.33
C5	162×229	6.38×9.02	B5	182x257	7.16x10.13
C6	114×162	4.51×6.38	B6	128x182	5.06x7.16
C7	81×114	3.19×4.51	B7	91x128	3.58x5.06
C8	57×81	2.25×3.19	B8	64x91	2.53x3.58
C9	40×57	1.59×2.25	B9	45x64	1.79x2.53
C10	28×40	1.12×1.59	B10	32x45	1.26x1.79

Width of Cn = 2^(-1/8-n/2) and Height = 2^(3/8-n/2)

The allowed tolerances are ±1.5 mm for dimensions up to 150 mm, ±2 mm for dimensions above 150 mm up to 600 mm, and ±3 mm for dimensions above 600 mm.

The A, B & C series are trimmed paper sizes. ISO also define format series RA and SRA for untrimmed raw paper, where SRA stands for 'supplementary raw format A'. These formats are only slightly larger than the corresponding A series formats. Sheets in these formats are cut to the end format after binding. The ISO RA0 format has an area of 1.05 m² and the ISO SRA0 format has an area of 1.15 m². These formats also follow the sqrt(2)-ratio and half-area rule, but the dimensions of the start format have been rounded to the full centimeter. The common untrimmed paper formats that printers order from the paper manufacturers are

RA SERIES	mm × mm	Inch × Inch	SRA SERIES	mm × mm	Inch × Inch
RA0	860×1220	33.86×48.03	SRA0	900×1280	35.43 × 50.39
RA1	610×860	24.01×33.86	SRA1	640×900	25.19×35.43
RA2	430×610	16.93×24.01	SRA2	450×640	17.71×25.19
RA3	305×430	12.00×16.93	SRA3	320×450	12.59×17.71
RA4	215×305	8.46×12.00	SRA4	225×320	8.85×12.59

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Common Application Examples:

A0 & A1	Technical drawings, posters
A1 & A2	Flip charts
A2 & A3	Drawings, diagrams, large tables
A4	Letters, magazines, forms, catalogs, laser printer and copying machine output
A5	Note pads
A6	Postcards
B5, A5, B6 A6	Books
C4, C5, C6	Envelopes for A4 letters: unfolded (C4), folded once (C5), folded twice (C6)
B4 & A3	Newspapers, supported by most copying machines in addition to A4
B8 & A8	Playing cards

Japanese Paper Sizes

Japan has adopted the ISO series A sizes, but its series B sizes are slightly different. These sizes are sometimes called JIS B or JB sizes.

A JB0 sheet has an area of 1.5 square meters. The area of each size is the arithmetic average of the areas of the A series page with the same number and the A series page with the next higher number. So for example, the area of a JB4 page is the average of the area of an A4 sheet and an A5 sheet. (In the ISO B series, the area of each sheet is the geometric mean of the A sizes, that is, the square root of the sum of their areas.)

JB SERIES	mm × mm	Inch × Inch	JB SERIES	mm × mm	Inch × Inch
JB0	1030×1456	40.55×57.32	JB6	128×182	5.06×7.17
JB1	728×1030	28.66×40.55	JB7	91×128	3.59×5.06
JB2	515×728	20.27×28.66	JB8	64×91	2.53×3.59
JB3	364×515	14.33×20.27	JB9	45×64	1.8×2.53
JB4	257×364	10.13×14.33	JB10	32×45	1.27×1.8
JB5	182×257	7.17×10.13

Japanese Traditional paper sizes

shiroku-ban

base size: 788 mm by 1091 mm (26 sun* × 36 sun)

4 × 6/4 264 by 379 ( × 12.5 sun)

4 × 6/5 191 by 259 (printing on half sheets)

4 × 6/5 189 by 262

kiku-ban

base size: 639 mm × 939 mm (21 sun × 31 sun)

Kiku 4, 227 mm × 306 mm

Kiku 5, 151 mm × 227 mm

* sun was a unit of length used in Japan and is equal to about 3.03 cm or 1.193 inches

The United States, Canada, and in part Mexico, are today the only industrialized nations in which the ISO standard paper sizes are not yet widely used.

US Engineering	mm × mm	Inch × Inch	US Architecture	mm × mm	Inch × Inch
ANSI A	215.9×279.4	8.5×11	ARCH A	228.6×304.8	9×12
ANSI B	279.4×431.8	11×17	ARCH B	304.8×457.2	12×18
ANSI C	431.8×558.8	17×22	ARCH C	457.2×509.6	18×24
ANSI D	588.8×863,6	22×34	ARCH D	609.6×914.4	24×36
ANSI E	863.6×1117.6	34×44	ARCH E	914.4×1219.2	36×48
			ARCH E1	762×1067	30×32
			ARCH E2	660×965	26×38
			ARCH E3	686×991	27×39

US Misc.	mm × mm	Inch × Inch	US Misc.	mm × mm	Inch × Inch
Letter	215.9×279.4	8.5×11	Folio	215.9×330.2	8.5×13
Legal	215.9×355.6	8.5×14	Quarto	215×275	8.46×10.8
US Govt	203.2×279.4	8×11	Tabloid	279.4×431.8	11×17
Statement	139.7×215.9	5.5×8.5	Ledger	279.4×431.8	11×17
Executive	184.2×266.7	7.25×10.5	Foolscap	342.9×431.8	13.5×17
Junior Legal	203.2×127	8.0×5.0	Organizer J	70×127	2.75×5
Compact	108×171	4.25×6.75	Post	394×489	15.5×19.5
Crown	381×508	15×20	Demy	445×572	17.5×22.5

http://www.cl.cam.ac.uk/~mgk25/iso-paper.html (A very good reference on paper sizes)

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