Ratios between units of measure at 96 dpi

ValuePixelPointPicaInchMillimeter
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