The tables below give the dimensions of the C series envelope sizes in a selection of units

Table of Envelope Sizes From C0 to C10 in Metric Units

This table gives width x height for C series envelope sizes in micrometres, millimetres, centimetres and metres in portrait orientation.

Size	Micrometres	Millimetres	Centimetres	Metres
C0	917000 x 1297000 μm	917 x 1297 mm	91.7 x 129.7 cm	0.917 x 1.297 m
C1	648000 x 917000 μm	648 x 917 mm	64.8 x 91.7 cm	0.648 x 0.917 m
C2	458000 x 648000 μm	458 x 648 mm	45.8 x 64.8 cm	0.458 x 0.648 m
C3	324000 x 458000 μm	324 x 458 mm	32.4 x 45.8 cm	0.324 x 0.458 m
C4	229000 x 324000 μm	229 x 324 mm	22.9 x 32.4 cm	0.229 x 0.324 m
C5	162000 x 229000 μm	162 x 229 mm	16.2 x 22.9 cm	0.162 x 0.229 m
C6	114000 x 162000 μm	114 x 162 mm	11.4 x 16.2 cm	0.114 x 0.162 m
C7	81000 x 114000 μm	81 x 114 mm	8.1 x 11.4 cm	0.081 x 0.114 m
C8	57000 x 81000 μm	57 x 81 mm	5.7 x 8.1 cm	0.057 x 0.081 m
C9	40000 x 57000 μm	40 x 57 mm	4.0 x 5.7 cm	0.040 x 0.057 m
C10	28000 x 40000 μm	28 x 40 mm	2.8 x 4.0 cm	0.028 x 0.040 m

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Table of Envelope Sizes From C0 to C10 in Imperial & US Customary Units

This table gives width x height for C series envelope sizes in thou, inches, feet and yards in portrait orientation.

Size	Thou	Inches	Feet	Yards
C0	36102 x 51063 th	36.102 x 51.063 in	3.009 x 4.255 ft	1.003 x 1.418 yd
C1	25512 x 36102 th	25.512 x 36.102 in	2.126 x 3.009 ft	0.709 x 1.003 yd
C2	18031 x 25512 th	18.031 x 25.512 in	1.503 x 2.126 ft	0.501 x 0.709 yd
C3	12759 x 18031 th	12.759 x 18.031 in	1.063 x 1.503 ft	0.354 x 0.501 yd
C4	9016 x 12759 th	9.016 x 12.759 in	0.751 x 1.063 ft	0.250 x 0.354 yd
C5	6378 x 9016 th	6.378 x 9.016 in	0.531 x 0.751 ft	0.177 x 0.250 yd
C6	4488 x 6378 th	4.488 x 6.378 in	0.374 x 0.531 ft	0.125 x 0.177 yd
C7	3189 x 4488 th	3.189 x 4.488 in	0.266 x 0.374 ft	0.089 x 0.125 yd
C8	2244 x 3189 th	2.244 x 3.189 in	0.187 x 0.266 ft	0.062 x 0.089 yd
C9	1575 x 2244 th	1.575 x 2.244 in	0.131 x 0.187 ft	0.044 x 0.062 yd
C10	1102 x 1575 th	1.102 x 1.575 in	0.092 x 0.131 ft	0.031 x 0.044 yd

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Table of Envelope Sizes From C0 to C10 - Typography & Plotter Units

This table gives width x height for C series paper sizes in pica, point and HPGL units in portrait orientation.

Size	Pica	Point	HPGL
C0	216.6 x 306.4	2599 x 3677	36680 x 51880
C1	153.1 x 216.6	1837 x 2599	25920 x 36680
C2	108.2 x 153.1	1298 x 1837	18320 x 25920
C3	76.5 x 108.2	918 x 1298	12960 x 18320
C4	54.1 x 76.5	649 x 918	9160 x 12960
C5	38.3 x 54.1	459 x 649	6480 x 9160
C6	26.9 x 38.3	323 x 459	4560 x 6480
C7	19.1 x 26.9	230 x 323	3240 x 4560
C8	13.5 x 19.1	162 x 230	2280 x 3240
C9	9.4 x 13.5	113 x 162	1600 x 2280
C10	6.6 x 9.4	79 x 113	1120 x 1600

Our table has used the modern desktop publishing pica and point sizes (1/6th of an inch and 1/72nd of an inch respectively). Click the following links for further background information on the pica and point

HPGL units are length units from Hewlett Packard's printer control language used by printers and plotters. 40 HPGL units = 1 mm and 1016 HPGL units is 1 inch, making the HPGL unit effectively a metric thou.

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Other Sizes

• A Series Paper Sizes
• B Series Paper Sizes
• C Sizes Background Information
• RA & SRA sizes
• US Paper Sizes
• Old Imperial Sizes