Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v3.2.5)
// ----

$base-font-size: 16px;
$base-line-height: 24px;

@mixin font-size($font-size, $rem-sizing: true, $line-height: true) {
  font-size: $font-size;

  @if $rem-sizing == true {
    font-size: calculate-rem($font-size);
  }

  @if $line-height == true {
    line-height: calculate-line-height($font-size);
  }
}

@function calculate-rem($font-size) {
  $rem-size: ($font-size / $base-font-size) * 1rem;

  @return $rem-size;
}


@function calculate-line-height($font-size) {
  $line-height-size: ceil($font-size / $base-line-height) * ($base-line-height / $font-size);

  @return $line-height-size;
}

@function strip-units($value) {
  @return $value / ($value * 0 + 1);
}

//============
// Tests
//============

.testing {
  @include font-size(24px);
}

SassMeister-output.css

.testing {
  font-size: 24px;
  font-size: 1.5rem;
  line-height: 1;
}