A6 at 72 DPI in pixels: 298 × 420

A6 at 72 DPI is 298 × 420 pixels

A6 (105 × 148 mm) at 72 DPI is 298 × 420 pixels, which is 0.13 megapixels.

Portrait	298 × 420 pixels
Landscape	420 × 298 pixels
With 3 mm bleed	315 × 437 pixels
Megapixels	0.13
Aspect ratio	1.41:1 (1 to √2 before rounding)
File size	367 KB as uncompressed 8-bit RGB; a JPEG or PNG is smaller
Paper size	105 × 148 mm (4.13 × 5.83 in)

Portrait

298 × 420 pixels

Landscape

420 × 298 pixels

With 3 mm bleed

315 × 437 pixels

Megapixels

0.13

Aspect ratio

1.41:1 (1 to √2 before rounding)

File size

367 KB as uncompressed 8-bit RGB; a JPEG or PNG is smaller

Paper size

105 × 148 mm (4.13 × 5.83 in)

The working

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

Width: 105 mm ÷ 25.4 = 4.134 in; 4.134 in × 72 = 297.6, which rounds to 298 pixels.
Height: 148 mm ÷ 25.4 = 5.827 in; 5.827 in × 72 = 419.5, which rounds to 420 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 315 × 437 pixels.

Is your photo big enough?

To fill A6 at 72 DPI an image needs at least 298 × 420 pixels. Cropped to fill the sheet:

A 12 megapixel phone photo (4000 × 3000) gives 686 DPI: enough.
A 24 megapixel camera photo (6000 × 4000) gives 968 DPI: enough.
A 48 megapixel photo (8000 × 6000) gives 1,373 DPI: enough.

At 72 DPI the pixels of a print blend together from about 47.7 inches (121 cm) away. 72 DPI is the old screen convention: early Macintosh displays showed 72 pixels to the inch, matching the 72 points in an inch of type. Many image files still carry a 72 DPI tag for that reason.

A6 at other resolutions

Resolution	Pixels	With bleed	Megapixels	Uncompressed
72 DPI	298 × 420	315 × 437	0.13	367 KB
96 DPI	397 × 559	420 × 582	0.22	650 KB
100 DPI	413 × 583	437 × 606	0.24	705 KB
150 DPI	620 × 874	656 × 909	0.54	1.6 MB
200 DPI	827 × 1165	874 × 1213	0.96	2.8 MB
240 DPI	992 × 1398	1049 × 1455	1.4	4 MB
300 DPI	1240 × 1748	1311 × 1819	2.2	6.2 MB
400 DPI	1654 × 2331	1748 × 2425	3.9	11 MB
600 DPI	2480 × 3496	2622 × 3638	8.7	25 MB
1200 DPI	4961 × 6992	5244 × 7276	35	99 MB

A6 is a quarter of A4, the size of a postcard. See A6 in pixels at every resolution or everything at 72 DPI.

A6 at 72 DPI is 298 × 420 pixels

The working

Is your photo big enough?

A6 at other resolutions

Other sizes at 72 DPI