A4 at 150 DPI in pixels: 1240 × 1754

A4 at 150 DPI is 1240 × 1754 pixels

A4 (210 × 297 mm) at 150 DPI is 1240 × 1754 pixels, which is 2.2 megapixels.

Portrait	1240 × 1754 pixels
Landscape	1754 × 1240 pixels
With 3 mm bleed	1276 × 1789 pixels
Megapixels	2.2
Aspect ratio	1.41:1 (1 to √2 before rounding)
File size	6.2 MB as uncompressed 8-bit RGB; a JPEG or PNG is smaller
Paper size	210 × 297 mm (8.27 × 11.69 in)

Portrait

1240 × 1754 pixels

Landscape

1754 × 1240 pixels

With 3 mm bleed

1276 × 1789 pixels

Megapixels

2.2

Aspect ratio

1.41:1 (1 to √2 before rounding)

File size

6.2 MB as uncompressed 8-bit RGB; a JPEG or PNG is smaller

Paper size

210 × 297 mm (8.27 × 11.69 in)

The working

Pixels are inches multiplied by the resolution, and an inch is 25.4 mm.

Width: 210 mm ÷ 25.4 = 8.268 in; 8.268 in × 150 = 1,240.2, which rounds to 1240 pixels.
Height: 297 mm ÷ 25.4 = 11.693 in; 11.693 in × 150 = 1,753.9, which rounds to 1754 pixels.

Bleed is extra image past the trim line, so that a cut that lands slightly off still leaves ink to the edge. Print shops usually ask for 3 mm on every side of an A-series page, which makes the file 1276 × 1789 pixels.

Is your photo big enough?

To fill A4 at 150 DPI an image needs at least 1240 × 1754 pixels. Cropped to fill the sheet:

A 12 megapixel phone photo (4000 × 3000) gives 342 DPI: enough.
A 24 megapixel camera photo (6000 × 4000) gives 484 DPI: enough.
A 48 megapixel photo (8000 × 6000) gives 684 DPI: enough.

At 150 DPI the pixels of a print blend together from about 22.9 inches (58 cm) away. 150 DPI is a common minimum for posters and large prints seen from a step or two away, and a usual setting for scanning documents that only need to be read.

A4 at other resolutions

Resolution	Pixels	With bleed	Megapixels	Uncompressed
72 DPI	595 × 842	612 × 859	0.5	1.4 MB
96 DPI	794 × 1123	816 × 1145	0.89	2.6 MB
100 DPI	827 × 1169	850 × 1193	0.97	2.8 MB
150 DPI	1240 × 1754	1276 × 1789	2.2	6.2 MB
200 DPI	1654 × 2339	1701 × 2386	3.9	11 MB
240 DPI	1984 × 2806	2041 × 2863	5.6	16 MB
300 DPI	2480 × 3508	2551 × 3579	8.7	25 MB
400 DPI	3307 × 4677	3402 × 4772	15	44 MB
600 DPI	4961 × 7016	5102 × 7157	35	100 MB
1200 DPI	9921 × 14031	10205 × 14315	139	398 MB

A4 is the standard page for letters and documents everywhere outside North America. See A4 in pixels at every resolution or everything at 150 DPI.

A4 at 150 DPI is 1240 × 1754 pixels

The working

Is your photo big enough?

A4 at other resolutions

Other sizes at 150 DPI