CSS Tools
CSS Units Converter
Convert between px, rem, em, %, vw, vh, pt, cm, mm, and in — see all results at once with custom base font size and viewport dimensions.
Input
Settings
Used for rem, em, and % calculations
Used for vw calculations
Used for vh calculations
Common Spacing Scale
4px0.25rem
8px0.5rem
12px0.75rem
16px1rem
24px1.5rem
32px2rem
48px3rem
64px4rem
96px6rem
All Conversions 16px =
16px1rem1em100%0.833333vw1.481481vh12pt0.423333cm4.233333mm0.166667in Reference Table
| Unit | Equivalent |
|---|---|
1px | 1/96 of 1in |
1rem | Equal to font-size of root element (default 16px) |
1em | Equal to font-size of parent element |
1% | Relative to parent element size |
1vw | 1% of viewport width |
1vh | 1% of viewport height |
1pt | 1/72 of 1in (print) |
1cm | ~37.8px |
1mm | ~3.78px |
1in | 96px (CSS reference pixel) |