CSS Unit Converter
px, rem, em, pt, %, vw, vh — with live viewport.
Viewport
1024 × 768
Root font
16px
16px equals
16 px
1 rem
1 em
12 pt
100 %
1.563 vw
2.083 vhvw/vh use the live viewport size; % and em use the base font sizes you set above.