java - PDF page size is not exact the one provided -

i need create pdf itext fixed dimensions:

height: 95 mm = 3.74 in

width: 50 mm = 1.96 in

so i've done in code:

float width = mmtopt(95);  float height = mmtopt(50); rectangle rectanglepage = new rectangle(width, height); document document = new document(rectanglepage, 0, 0, 0, 0); 

where mmtopt() function (according documentation 70pt=1in=2.54cm):

public static float mmtopt(float mm){     //70pt = 25.4mm     return ((70f * mm) / 25.4f); } 

the problem when open pdf generated going file/properties can see says page size 3.64 x 1.91 in. not exact size i'm setting (it's 2 or 3 mm shorter - though it's little it's important because file must have dimensions).

what can happening? how can solve problem?

thanks.

it's 72 dots == 1 inch, not 70.