About this tool
Convert CSS length units using px as the base and a configurable root font-size, all in your browser.
Frequently asked questions
How are rem and em calculated?
Both are taken relative to the root font-size you set (default 16px), so 1rem and 1em equal that many pixels here.
What pixel ratios are used?
CSS reference units: 1in = 96px, 1pc = 16px, 1pt = 96/72px and 1cm = 96/2.54px.