---
title: "C5 envelope size — 162 × 229 mm"
description: "C5 envelope: 162 × 229 mm — holds A4 folded once, or A5 flat. Full dimensions in millimetres, centimetres and inches, and what the standard actually specifies."
url: https://atoneplace.net/size/c5-envelope/
site: "At One Place"
---

# C5 envelope size

**C5 envelope: 162 × 229 mm**

162 × 229 mm — holds A4 folded once, or A5 flat.

Takes an A4 sheet folded in half, or an A5 sheet unfolded. The common size for cards and short documents.

## The numbers

- **Millimetres:** 162 × 229
- **Centimetres:** 16.2 × 22.9
- **Inches:** 6.38 × 9.02
- **Aspect ratio:** 1.4136 : 1
- **Area:** 0.0371 m²
- **Defined by:** ISO 269

## Envelope sizes

| Size | Millimetres | Inches |
| --- | --- | --- |
| C4 envelope | 229 × 324 mm | 9.02 × 12.76 |
| C5 envelope ← | 162 × 229 mm | 6.38 × 9.02 |
| DL envelope | 220 × 110 mm | 8.66 × 4.33 |

## Common questions

### What size is C5 envelope?

162 × 229 mm — holds A4 folded once, or A5 flat.

### Which standard defines C5 envelope?

ISO 269

## Related pages

- [DL envelope size](https://atoneplace.net/size/dl-envelope/)
- [C4 envelope size](https://atoneplace.net/size/c4-envelope/)

## Sources

- Official vendor product documentation — At One Place (/about/)