Type	Width mm	Height mm	Width (inch)	Height(inch)
A0	841	1189	33	464/5
A1	594	841	231/3	331/9
A2	420	594	161/2	231/3
A3	297	420	112/3	161/2
A4	210	297	81/4	112/3
A5	148	210	54/5	81/4
A6	105	148	41/8	54/5
A7	74	105	29/10	41/8
A8	52	74	21/20	29/10
Business card (Japan)	55	91	21/6	37/12
Business card (UK)	55	85	21/6	31/3
Business card (US)	51	89	2	312
C0	1297	917	51	361/10
C1	917	648	36	251/2
C2	648	458	251/2	18
C3	458	324	18	123/4
C4	324	229	123/4	9
C5	229	162	9	61/3
C6	162	114	61/3	41/2
CD case insert	120	120	41/2	41/2
DL	220	110	83/4	43/8
Executive	184	267	71/4	101/2
Foolscap	336	419	131/4	161/2
Gov. Legal	216	330	81/2	13
Gov. Letter	203	267	8	101/2
Imperial	559	761	22	30
Legal	216	356	81/2	14
Letter	216	279	81/2	11
Royal	507	634	20	25

All sizes are very approximate. This list represents some popular sizes, however, there are many more options. Sizes C0 to C6 are often used for envelopes