Found Via: http://pxtoem.com/
Do you hate having to pull out the calculator every time you want to convert pixels to ems? Sometimes, it’s quicker to simply use pixels because we simply don’t have the time to figure out the correct value. Luckily, an online service called pxtoem.com makes it laughably simple, and more importantly quick, to convert pixels to ems. All that you need to know is your base font size.
PX to EM conversion made simple.
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