Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.14)
// Compass (v1.0.0.rc.1)
// Modular Scale (v2.0.5)
// ----

@import "modular-scale";

$font-base: 16px !default;
$font-scale: 1.5 !default;
// shouldn't need to modify these
$font-keywords: (xsmall: -2, small: -1, medium: 0, large: 1, xlarge: 2);
$fractional-units: em, rem, unquote('%'); // add as needed

@function size($keyword, $base: $font-base, $scale: $font-scale) {
  $size: ms(map-get($font-keywords, $keyword), $base, $scale);
  @return if(index($fractional-units, unit($base)), $size, round($size));
}

.foo {
  a: size(medium);
  b: size(small);
  c: size(large, 1em);
  d: size(xlarge, 1em);
  f: size(xsmall, size(small));
}

SassMeister-output.css

.foo {
  a: 16px;
  b: 11px;
  c: 1.5em;
  d: 2.25em;
  f: 5px;
}