Convert pixel units to rem
Px to rem
A simple calculator to convert pixel values to rem values
Simply open up the popup window and add the pixel sizes you want to convert in the textarea and the list will be automatically updated with the rem versions of those pixel values.
You can also set the base pixel value too.
Best of all, the values are stored locally so whatever changes you make will be there when you open the popup window.
Sidenote - I've launched Snapfont, a Chrome plugin to test fonts on any live website. Check it out at getsnapfont.com