Envelope standard size design
Envelope Size
mm (w x h)
cm (w x h)
in (w x h)
DL
220x 110 mm
22×11 cm
8.66x 4.33 inches
C0
917x 1297 mm
91.7×129.7 cm
36.1×51.5 inches
C1
648×917 mm
64.8x 91.7 cm
25.5×36.1 inches
C2
458x 648 mm
45.8×64.8 cm
18x 25.5 inches
C3
324x 458 mm
32.4×45.8 cm
12.8×18 inches
C4
229×324 mm
22.9×32.4 cm
9×12.8 inches
C5
162×229 mm
16.2x 22.9 cm
6.4×9 inches
C6
114×162 mm
11.4×16.2 cm
4.5×6.4 inches
C7
81×114 mm
8.1×11.4 cm
3.2x 4.5 inches
C8
57×81 mm
5.7×8.1 cm
2.2×3.2 inches
C9
40×57 mm
4×5.7 cm
1.6×2.2 inches
C10
28×40 mm
2.8×4 cm
1.1×1.6 inches