Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.4)
// Compass (v1.0.0.alpha.18)
// ----

$total-columns: 24;
$column-width: 4em;
$gutter-width: 1em;

@function columns-width(
  $columns  : $total-columns // 12
) {
  @return ($columns * $column-width) // 48
        + (if($columns >= 1, ceil($columns - 1), 0) * $gutter-width);
}

.this {
  this: $total-columns * $column-width;
  plus: if($total-columns >= 1, ceil($total-columns - 1), 0);
}

SassMeister-output.css

.this {
  this: 96em;
  plus: 23;
}