ISO A series
A4 paper size
A4 measures 210 x 297 mm (8.27 x 11.69 in). Letters, office documents, magazines, forms and catalogues — the standard sheet outside North America.
210 x 297millimetres
8.27 x 11.69inches
2,480 x 3,508pixels @ 300 dpi
Dimensions in every unit
| Unit | Width x height |
|---|---|
| Millimetres | 210 x 297 mm |
| Centimetres | 21 x 29.7 cm |
| Inches (decimal) | 8.268 x 11.693 in |
| Inches (fraction) | 8 1/4 x 11 11/16 in |
| Points (1/72 in) | 595.3 x 841.9 pt |
| Picas | 49.61 x 70.16 pc |
Pixel dimensions by resolution
| Resolution | Pixels | Megapixels |
|---|---|---|
| 72 dpi | 595 x 842 px | 0.5 MP |
| 96 dpi | 794 x 1,123 px | 0.9 MP |
| 150 dpi | 1,240 x 1,754 px | 2.2 MP |
| 200 dpi | 1,654 x 2,339 px | 3.9 MP |
| 300 dpi | 2,480 x 3,508 px | 8.7 MP |
| 600 dpi | 4,961 x 7,016 px | 34.8 MP |
300 dpi is the usual target for printed photos and artwork; 72–96 dpi is screen resolution.
Document size with bleed
| Bleed | Millimetres | Inches |
|---|---|---|
| 3 mm bleed (each side) | 216 x 303 mm | 8.504 x 11.929 in |
| 0.125 in bleed (each side) | 216.4 x 303.4 mm | 8.518 x 11.943 in |
How many A4 fit on a press sheet
| Sheet | Without bleed | With 3 mm bleed |
|---|---|---|
| A4 | 1-up | 0-up |
| A3 | 2-up | 1-up |
| SRA3 | 2-up | 2-up |
| Tabloid 11 x 17 in | 1-up | 1-up |
| 12 x 18 in | 2-up | 2-up |
| 13 x 19 in (Super B) | 2-up | 2-up |
| B2 (offset) | 4-up | 4-up |
| B1 (offset) | 9-up | 9-up |
Simple grid imposition with no gutters or gripper margin; real layouts may fit fewer.
Envelopes for A4
| Fold | Folded size | Envelopes that fit |
|---|---|---|
| Unfolded | 210 x 297 mm | 9 x 12 catalog envelope, C4 envelope, 10 x 13 catalog envelope |
| Folded in half | 148.5 x 210 mm | 6 x 9 booklet envelope, C5 envelope, Invite envelope |
| Folded in thirds | 99 x 210 mm | DL envelope, #10 envelope, Italian envelope |
The √2 system
A4 has an aspect ratio of 1 : 1.4143 — close to √2 (1.4142). Folding or cutting it in half across the long side produces the next smaller size in the series with the same proportions, and two sheets side by side form the next larger size. This is why scaling between sizes in the series (for example on a photocopier) never crops or distorts the page.
Similar sizes
Frequently asked questions
What are the dimensions of A4?
A4 is 210 x 297 mm, which is 8.27 x 11.69 in (8 1/4 x 11 11/16 in).
How many pixels is A4 at 300 DPI?
2,480 x 3,508 pixels at 300 dpi, or 1,240 x 1,754 at 150 dpi.
Is A4 the same as US Letter?
No. A4 (210 x 297 mm) is 6 mm narrower and 18 mm taller than US Letter (215.9 x 279.4 mm). Documents laid out for one may be scaled or cropped when printed on the other.
Sources & data
- Dimensions per the relevant standard; see sources.