Ratios between units of measure at 96 dpi

Value Pixel Point Pica Inch Millimeter
1 pixel =1 px =0.75pt(3/4) =0.063pc(1/16) =0.0104in(1/96) =0.265mm
1 point =1.333px(4/3) =1pt =0.083pc(1/12) =0.0138in(1/72) =0.353mm
1 pica =16px =12pt =1pc =0.1667in(1/6) =4.233mm
1 inch =96px =72pt =6pc =1in =25.4mm
1 mm =3.799px =2.835pt =4.233pc =0.039in =1mm