ISO 216 — A series

A4 size

210 × 297 mm

8.27 × 11.69 in · 21 × 29.7 cm

A4 measures 210 × 297 mm (21 × 29.7 cm; 8.27 × 11.69 in). At 300 DPI that is 2480 × 3508 pixels.

Millimetres
210 × 297 mm
Centimetres
21 × 29.7 cm
Inches
8.27 × 11.69 in
Points (pt)
595 × 842 pt

A4 in pixels

DPIPixels (portrait)Typical use
72595 × 842Legacy screen standard, PDF points
96794 × 1123Screens, CSS pixels
1501240 × 1754Everyday printing
3002480 × 3508Print quality

Adjacent sizes

FAQ — A4

What size is A4 in centimetres?

A4 is 21 × 29.7 cm (210 × 297 mm) in portrait orientation.

How many pixels is A4?

It depends on the resolution: at 300 DPI (print) A4 is 2480 × 3508 pixels; at 96 DPI (screen) it is 794 × 1123 pixels.

How is the A series defined?

Every ISO 216 A-series size has a √2 ≈ 1:1.414 aspect ratio. Each size is half the previous one: fold A3 in half and you get A4. That is why documents scale between sizes without distortion.

Are A4 and Letter the same?

No. A4 is 210 × 297 mm while Letter is 215.9 × 279.4 mm — Letter is 6 mm wider and 18 mm shorter. Documents laid out for A4 reflow when printed on Letter (and vice versa).

What is A4 used for?

The standard for documents, letters and printing in Europe.

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