Millimetres (mm) to pixels converter

Pixels = mm ÷ 25.4 × DPI. Enter a size and DPI to get pixels, or pixels to get the printed size. Example: 35 mm at 300 DPI = 413 px.

Size to pixels

WidthHeightUnit

DPI

413 × 531 px

Pixels to size

Pixels

at 300 DPI (set on the left)

5.08 cm · 50.8 mm · 2 in

Millimetres to pixels table

mm	72 DPI	96 DPI	150 DPI	300 DPI	600 DPI
10 mm	28 px	38 px	59 px	118 px	236 px
20 mm	57 px	76 px	118 px	236 px	472 px
25 mm	71 px	94 px	148 px	295 px	591 px
30 mm	85 px	113 px	177 px	354 px	709 px
33 mm	94 px	125 px	195 px	390 px	780 px
35 mm	99 px	132 px	207 px	413 px	827 px
40 mm	113 px	151 px	236 px	472 px	945 px
45 mm	128 px	170 px	266 px	531 px	1063 px
48 mm	136 px	181 px	283 px	567 px	1134 px
50 mm	142 px	189 px	295 px	591 px	1181 px
100 mm	283 px	378 px	591 px	1181 px	2362 px
210 mm	595 px	794 px	1240 px	2480 px	4961 px

Questions

How many pixels is 1 mm?

At 300 DPI, 1 mm is 12 pixels; at 96 DPI it is 4. Pixels depend on the DPI because a pixel has no fixed physical size.

What is the formula to convert millimetres to pixels?

Pixels = mm ÷ 25.4 × DPI, rounded to a whole pixel. For example 35 mm at 300 DPI is 413 pixels.

Which DPI should I use for a form photo?

Use the DPI your form or printer asks for. If none is given, 300 DPI is the usual choice for printed photos; screens and most online forms only check the pixel size.

Resize a photo to this size cm to pixels inch to pixels KB to MB