Convert mm to mil
More information from the unit converter. How many mm in 1 mil? The answer is 0.0254. We assume you are converting between millimetre and mil.You can view more details on each measurement unit: mm or mil The SI base unit for length is the metre. 1 metre is equal to 1000 mm, or 39370.078740157 mil. Note that rounding errors may occur, so always check the results.