C5 paper size
162 × 229 mm
6.38 × 9.02 inches · 16.2 × 22.9 cm · aspect ratio 1:1.41
C5 size is 162 × 229 mm. Those are the C5 dimensions a printer works to; the same sheet in centimetres, inches, points and pixels is below.
What C5 is for
C5 at 162 × 229 mm takes an A4 sheet folded once, or an A5 sheet unfolded. It is the middle size of the C series and the usual envelope for a multi-page letter that does not warrant the cost of sending A4 flat.
C5 dimensions in every unit
| Unit | Width | Height |
|---|---|---|
| Millimetres | 162 mm | 229 mm |
| Centimetres | 16.2 cm | 22.9 cm |
| Inches | 6.38 in | 9.02 in |
| Points (PostScript) | 459 pt | 649 pt |
C5 in pixels
Pixel dimensions depend entirely on the resolution you are working at — there is no single "pixel size" for a sheet of paper. C5 size in pixels has every resolution, with file sizes and canvas setup.
| Resolution | Pixels | Use |
|---|---|---|
| 72 DPI | 459 × 649 | Screen preview only — far too coarse to print |
| 150 DPI | 957 × 1352 | Draft printing, internal documents |
| 300 DPI | 1913 × 2705 | The standard for commercial print |
| 600 DPI | 3827 × 5409 | Fine detail, line art, archival scanning |
Setting up a print document? Use 300 DPI and add 3 mm of bleed on every edge unless your printer specifies otherwise.
How C5 relates to the rest of the series
C5 is C0 halved 5 times. Halving a sheet across its longer side is what generates the next size down, and because the sides are in a 1:√2 ratio the proportions survive every fold — which is the entire reason the series exists.
That makes 32 sheets of C5 exactly one sheet of C0, with nothing left over. The area works out at 0.0313 m², since C0 is defined as one square metre.
Scaling to the next size up or down is a factor of √2 ≈ 1.414 on each edge, so enlarging C5 to the next size is 141% on a photocopier and reducing it is 71%. Those two numbers are on the preset buttons of most copiers for exactly this reason, and they are the same for every size in the series.
About C5
Takes an A4 sheet folded once, or an unfolded A5.
Other ISO C series sizes
| Size | Millimetres | Inches |
|---|---|---|
| C4 | 229 × 324 mm | 9.02 × 12.76 in |
| C6 | 114 × 162 mm | 4.49 × 6.38 in |
| DL | 110 × 220 mm | 4.33 × 8.66 in |
| C3 | 324 × 458 mm | 12.76 × 18.03 in |
| C7 | 81 × 114 mm | 3.19 × 4.49 in |
Frequently asked questions
What size is C5 in mm?
162 × 229 mm.
What size is C5 in inches?
6.38 × 9.02 inches.
What size is C5 in pixels?
There is no single answer — it depends on resolution. At the print standard of 300 DPI it is 1913 × 2705 pixels; at 72 DPI it is only 459 × 649.