DPI: 1200 dpi high-end printer

Use this calculator to find out how many pixels (resolution) an image should have to be printed at a certain size.

Print Dimensions

Net dimensions (no bleed)
40.64 mm x 22.86 mm = 929.03 mm2aspect ratio: 1.778 (diagonal: 46.63 mm)
4.06 cm x 2.29 cm = 9.3 cm2aspect ratio: 1.773 (diagonal: 4.66 cm)

Print Pixel Size

Dots-per-inch
Printer resolution = 1200 dpi = 472 dots/cm
Printer pitch = 21 µm / micrometer (size of 1 pixel)
Net dimensions (no bleed)
1920 px x 1080 px = 2.1 megapixels
= aspect ratio 1.778

Some examples

References