---
title: "A1 size — 594 × 841 mm"
description: "A1: 594 × 841 mm — 23.39 × 33.11 inches. Full dimensions in millimetres, centimetres and inches, and what the standard actually specifies."
url: https://atoneplace.net/size/a1/
site: "At One Place"
---

# A1 size

**A1: 594 × 841 mm**

594 × 841 mm — 23.39 × 33.11 inches.

A1 is 594 × 841 mm. Two sheets of A1 side by side make one A0, and folding it in half gives A2. The 1:√2 proportion is what makes that work: it is the only ratio preserved when a rectangle is halved, which is why scaling between A sizes never crops or leaves margins.

## The numbers

- **Millimetres:** 594 × 841
- **Centimetres:** 59.4 × 84.1
- **Inches:** 23.39 × 33.11
- **Aspect ratio:** 1.4158 : 1
- **Area:** 0.4996 m²
- **Defined by:** ISO 216

## Paper sizes

| Size | Millimetres | Inches |
| --- | --- | --- |
| B0 | 1000 × 1414 mm | 39.37 × 55.67 |
| A0 | 841 × 1189 mm | 33.11 × 46.81 |
| B1 | 707 × 1000 mm | 27.83 × 39.37 |
| A1 ← | 594 × 841 mm | 23.39 × 33.11 |
| B2 | 500 × 707 mm | 19.69 × 27.83 |
| A2 | 420 × 594 mm | 16.54 × 23.39 |
| B3 | 353 × 500 mm | 13.90 × 19.69 |
| A3 | 297 × 420 mm | 11.69 × 16.54 |
| Tabloid / Ledger | 279.4 × 431.8 mm | 11.00 × 17.00 |
| B4 | 250 × 353 mm | 9.84 × 13.90 |
| US Legal | 215.9 × 355.6 mm | 8.50 × 14.00 |
| A4 | 210 × 297 mm | 8.27 × 11.69 |
| US Letter | 215.9 × 279.4 mm | 8.50 × 11.00 |
| B5 | 176 × 250 mm | 6.93 × 9.84 |
| A5 | 148 × 210 mm | 5.83 × 8.27 |
| B6 | 125 × 176 mm | 4.92 × 6.93 |
| A6 | 105 × 148 mm | 4.13 × 5.83 |
| A7 | 74 × 105 mm | 2.91 × 4.13 |
| A8 | 52 × 74 mm | 2.05 × 2.91 |
| A9 | 37 × 52 mm | 1.46 × 2.05 |
| A10 | 26 × 37 mm | 1.02 × 1.46 |

## Common questions

### What size is A1?

594 × 841 mm — 23.39 × 33.11 inches.

### Which standard defines A1?

ISO 216

## Related pages

- [A4 size](https://atoneplace.net/size/a4/)
- [US Letter size](https://atoneplace.net/size/us-letter/)
- [A3 size](https://atoneplace.net/size/a3/)
- [A5 size](https://atoneplace.net/size/a5/)
- [A0 size](https://atoneplace.net/size/a0/)
- [US Legal size](https://atoneplace.net/size/us-legal/)
- [A2 size](https://atoneplace.net/size/a2/)
- [B5 size](https://atoneplace.net/size/b5/)
- [Tabloid / Ledger size](https://atoneplace.net/size/tabloid/)
- [A6 size](https://atoneplace.net/size/a6/)
- [A7 size](https://atoneplace.net/size/a7/)
- [B0 size](https://atoneplace.net/size/b0/)

## Sources

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