How to convert CSS millimetres to CSS pixels
px = mm × 3.77952755905512
Multiply the mm reading by 3.77952755905512.
Worked examples
1 mm ≈ 3.779527559 px
1 × 3.77952755905512 ≈ 3.779527559
Font basis for this example: element 16 px; root 16 px.
25.4 mm ≈ 96 px
25.4 × 3.77952755905512 ≈ 96
Font basis for this example: element 16 px; root 16 px.
Frequently asked questions
Which font or display assumption applies?
em and rem depend on the specified font context. CSS absolute units have fixed relationships to reference pixels, which do not necessarily equal physical display pixels.