Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v3.2.4)
// ----

@function modular-scale($value, $increment, $ratio) {
  @if $increment > 0 {
    @for $i from 1 through $increment {
      $value: ($value * $ratio);
    }
  }

  @if $increment < 0 {
    $increment: abs($increment);
    @for $i from 1 through $increment {
      $value: ($value / $ratio);
    }
  }

  @return $value;
}

//  div {
//                     Increment Up GR with positive value
//   font-size:        modular-scale(14px,   1, 1.618); // returns: 22.652px
//
//                     Increment Down GR with negative value
//   font-size:        modular-scale(14px,  -1, 1.618); // returns: 8.653px
//
//                     Can be used with ceil(round up) or floor(round down)
//   font-size: floor( modular-scale(14px, 1, 1.618) ); // returns: 22px
//   font-size:  ceil( modular-scale(14px, 1, 1.618) ); // returns: 23px
//  }
//
// modularscale.com

//and the variables:
$golden:           1.618;
$minor-second:     1.067;
$major-second:     1.125;
$minor-third:      1.2;
$major-third:      1.25;
$perfect-fourth:   1.333;
$augmented-fourth: 1.414;
$perfect-fifth:    1.5;
$minor-sixth:      1.6;
$major-sixth:      1.667;
$minor-seventh:    1.778;
$major-seventh:    1.875;
$octave:           2;
$major-tenth:      2.5;
$major-eleventh:   2.667;
$major-twelfth:    3;
$double-octave:    4;

@function golden-ratio($value, $increment) {
  @return modular-scale($value, $increment, $golden)
}

//  div {
//    font-size: golden-ratio(14px, 1); // returns: 22.652px
//  }
//
// goldenratiocalculator.com

div {
  font-size: floor(golden-ratio(14px, 1)); // returns: 22.652px
}

SassMeister-output.css

div {
  font-size: 22px;
}