Remove unit in SASS

_remove-unit.scss

// extract to https://gist.github.com/moyarich/3260638

@function remove-unit($target){
  $one:1;
  @if not unitless($target){
    // Find out the unit of measurement being used
    @if     (unit($target) == "px"){ $one:1px; }
    @elseif (unit($target) == "em"){ $one:1em; }
    @elseif (unit($target) == "%" ){ $one:1%;  }
    // Dividing by the same unit forces sass to return a value with no unit
    @return $target / $one ;
  }
  @else {
    @return $target;
  }
}