1 mil = 0.0254 millimeters
4 mil = 0.1016 millimeters
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1,570,000 Unless you are using mil to mean "millimetre" then 1.57 mil = 1.57 mm = 0.00157 m Or you are using mil to mean "millilitre" then 1.57 mil = 1.57 ml = 0.00157 l. Or you are using mil to mean "thousandths of an inch" then 1.57 mil = 0.00157 inch.
A 4 mil thickness is four thousandths (0.004) of an inch.
No. Mils are much smaller than mms.
25.4 mm = 1 in → 4 mm = 4 ÷ 25.4 in ≈ 0.16 in
1 cm = 10 mm ⇒ 4 cm = 4 x 10 mm = 40 mm