CSS Summit - PX to EM

px-to-em.scss

// Thanks to Chris Eppstein for this gem

$base-line-height: 18px !default;
$base-font-size: 13px !default;
$base-em-ratio: 1em / $base-font-size !default; // used by the px-to-em function below

// Converts px to em in case you do need relative units in your output.
@function px-to-em($value, $em-ratio: $base-em-ratio) {
  @return $value * $em-ratio;
}