Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.12)
// Compass (v1.0.3)
// ----

@function em($target, $context: $baseFontSize) {
  @if $target == 0 {
    @return 0;
  }
  @return $target / $context + 0em;
}

$baseFontSize: 14px;

div {
  font-size: em(18px); // => 1.28571em => 18px
}

$baseFontSize: 18px;

div {
  font-size: em(18px); // => 1em => 18px
}

SassMeister-output.css

div {
  font-size: 1.28571em;
}

div {
  font-size: 1em;
}