A4 size in cm, mm, inches and pixels
A4 is 21 × 29.7 cm (210 × 297 mm, or 8.27 × 11.69 inches).
A4 dimensions in every unit
| Unit | Width | Height |
|---|---|---|
| Millimetres | 210 mm | 297 mm |
| Centimetres | 21 cm | 29.7 cm |
| Inches | 8.27 in | 11.69 in |
| Points (1/72 in) | 595 pt | 842 pt |
A4 in pixels at common resolutions
| Resolution | Width | Height | Typical use |
|---|---|---|---|
| 72 dpi | 595 px | 842 px | PDF and design software default |
| 96 dpi | 794 px | 1123 px | Browser and screen CSS |
| 150 dpi | 1240 px | 1754 px | Draft and large-format print |
| 300 dpi | 2480 px | 3508 px | Standard print quality |
Pixels are the size in inches multiplied by the resolution: 8.268 in × 300 = 2480 px.
About A4 paper
A4 is the everyday paper size in the UK, Europe and most of the world outside North America. Letters, forms, CVs, reports and most home and office printers are set up for it.
Fold an A4 sheet in three and it becomes 99 × 210 mm, which fits a DL envelope (110 × 220 mm). Laid flat, it fits a C4 envelope (229 × 324 mm) without folding.
Against US Letter (215.9 × 279.4 mm), A4 is 5.9 mm narrower and 17.6 mm taller, so a document laid out for one often needs rescaling for the other. When a copier reduces A3 to A4 the scale is about 71%, and A4 to A3 is about 141%.
A4 compared with the other A sizes
Each A size is half the area of the one before, and every sheet has the same 1 : 1.414 shape. This table shows how many A4 sheets fill each size:
| Size | Dimensions | A4 sheets per sheet |
|---|---|---|
| A0 | 841 × 1189 mm | 16 |
| A1 | 594 × 841 mm | 8 |
| A2 | 420 × 594 mm | 4 |
| A3 | 297 × 420 mm | 2 |
| A4 | 210 × 297 mm | 1 |
| A5 | 148 × 210 mm | 1/2 |
| A6 | 105 × 148 mm | 1/4 |
| A7 | 74 × 105 mm | 1/8 |
| A8 | 52 × 74 mm | 1/16 |
Print A4 at actual size
Download the A4 actual-size guide (PDF): it shows the outlines of A5, A6, A7 and A8 at true size on one A4 sheet, with a 10 cm ruler to check your printer. Print it at 100% (turn off “fit to page”).
The full table of sizes, including B series, US sizes and envelopes, is on the paper sizes page.
Frequently asked questions
What size is A4 in cm?
A4 is 21 x 29.7 cm (210 x 297 mm).
What size is A4 in inches?
A4 is 8.27 x 11.69 inches.
What size is A4 in pixels?
At 300 dpi A4 is 2480 x 3508 pixels, at 150 dpi it is 1240 x 1754 pixels, and at 72 dpi it is 595 x 842 pixels.
How many A5 sheets make A4?
Two A5 sheets make one A4.
How many A4 sheets make A3?
Two A4 sheets make one A3.
Is A4 the same as US Letter?
No. A4 is 210 x 297 mm. US Letter is 215.9 x 279.4 mm, so A4 is 5.9 mm narrower and 17.6 mm taller.
What is the area of A4?
A4 is 0.0624 square metres (210 x 297 mm). A0 is defined as one square metre and every step down halves the area.