RuledSheet

C5 envelope size

C5 envelopes measure 162 × 229 mm (6.38 × 9.02 in). They hold an A5 sheet flat or an A4 sheet folded once.

C5 envelope Holds A5, or A4 folded once
Millimetres162 × 229 mm
Centimetres16.2 × 22.9 cm
Inches6.38 × 9.02 in
PDF points (1/72 in)459.21 × 649.13 pt
Pixels at 72 dpi459 × 649 px
Pixels at 150 dpi957 × 1352 px
Pixels at 300 dpi1913 × 2705 px
C56 × 9 in catalog
Drawn to the same scale.
C5 envelope next to its neighbours
SizemminchesDifference from C5 envelope
C5 envelope162 × 2296.38 × 9.02—
6 × 9 in catalog envelope152.4 × 228.66 × 9-9.6 mm wide, -0.4 mm tall
A5
Millimetres148 × 210 mm
Centimetres14.8 × 21 cm
Inches5.83 × 8.27 in
PDF points (1/72 in)419.53 × 595.28 pt
Pixels at 72 dpi420 × 595 px
Pixels at 150 dpi874 × 1240 px
Pixels at 300 dpi1748 × 2480 px
A4
Millimetres210 × 297 mm
Centimetres21 × 29.7 cm
Inches8.27 × 11.69 in
PDF points (1/72 in)595.28 × 841.89 pt
Pixels at 72 dpi595 × 842 px
Pixels at 150 dpi1240 × 1754 px
Pixels at 300 dpi2480 × 3508 px

What C5 envelope is used for

  • Letters and documents folded once
  • Brochures, catalogues and greeting cards in A5
  • Booklets

C5 vs 6 × 9 in

The US 6 × 9 in catalog envelope (152.4 × 228.6 mm) is almost the same length but 9.6 mm narrower; A5 fits both.

Questions

Will an A4 sheet fit in a C5 envelope?

Yes, folded once across the middle.

Is C5 bigger than A5?

Yes, by 14 mm in width and 19 mm in length, so an A5 sheet slides in flat.