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Millimetres to inches (and points and pixels)
Short answer
One inch is exactly 25.4 mm, so inches = millimetres ÷ 25.4 and millimetres = inches × 25.4. A point is 1/72 inch (0.3528 mm). In pixels, a size depends on the resolution: at 300 dpi, 1 mm is 11.81 px and 1 inch is 300 px.
Common packaging sizes
mminch
80 × 50 × 140 mm3.15 × 1.97 × 5.51 in
100 × 100 × 100 mm3.94 × 3.94 × 3.94 in
150 × 100 × 50 mm5.91 × 3.94 × 1.97 in
200 × 150 × 60 mm7.87 × 5.91 × 2.36 in
220 × 85 × 340 mm8.66 × 3.35 × 13.39 in
300 × 200 × 220 mm11.81 × 7.87 × 8.66 in
Questions
How many mm in an inch?
Exactly 25.4 mm: the inch has been defined as 25.4 mm since 1959.
How many pixels is 1 mm at 300 dpi?
11.81 pixels (300 ÷ 25.4). An A4 page (210 × 297 mm) is 2480 × 3508 px at 300 dpi.
What is a point in print?
A typographic point is 1/72 inch, 0.3528 mm. 12 pt type is about 4.2 mm from the top of the tallest letter to the bottom of the lowest.