C5 Envelope Size
C5 measures 162 × 229 mm (6.38 × 9.02 in). It is the ISO C envelope for an A4 letter folded once, or an A5 sheet flat, sitting between A5 and B5.
C5 measures 162 millimetres wide and 229 millimetres tall.
C5 Dimensions in Each Unit
C5 is 162 × 229 mm, which is 16.2 × 22.9 cm or 6.38 × 9.02 in. It is C4 cut in half.
| Unit | Width | Height | Width × height | Copy |
|---|---|---|---|---|
| Millimetres (mm) | 162 | 229 | 162 × 229 mm | |
| Centimetres (cm) | 16.2 | 22.9 | 16.2 × 22.9 cm | |
| Metres (m) | 0.162 | 0.229 | 0.162 × 0.229 m | |
| Inches (in) | 6.38 | 9.02 | 6.38 × 9.02 in | |
| Feet (ft) | 0.53 | 0.75 | 0.53 × 0.75 ft | |
| Points (pt) | 459 | 649 | 459 × 649 pt | |
| Picas (pc) | 38.3 | 54.1 | 38.3 × 54.1 pc | |
| Pixels at 72 DPI | 459 | 649 | 459 × 649 px | |
| Pixels at 150 DPI | 957 | 1352 | 957 × 1352 px | |
| Pixels at 300 DPI | 1913 | 2705 | 1913 × 2705 px | |
| Pixels at 600 DPI | 3827 | 5409 | 3827 × 5409 px |
Pixel counts follow from the resolution: pixels = millimetres ÷ 25.4 × DPI. More on the DPI and pixels page.
C5 Shape and Area
| Aspect ratio | 1 : 1.414 (√2) |
|---|---|
| Area | 0.0371 m² · 37,098 mm² |
| Diagonal | 280.5 mm · 11.04 in |
| ISO 216 tolerance | ± 2 mm each side |
| Governing standard | ISO 216:2007 |
C5 to Scale
C5 is half of C4 and folds in half to C6. Put C5 next to another size in the comparison tool.
Frequently Asked Questions
What size is a C5 envelope?
C5 is 162 by 229 mm, or 6.38 by 9.02 inches.
What fits in a C5 envelope?
An A5 sheet flat, or an A4 sheet folded once in half.
Is C5 bigger than DL?
In area, yes. C5 is 162 by 229 mm; DL is 110 by 220 mm. DL is longer and much narrower, sized for a triple-folded letter.
Envelope Sizes
✓ Dimensions per ISO 216:2007; unit values derived by formula. Reviewed . Editorial Process →