Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v0.7.0)
// ----

@mixin spans($args) {
  $columns: $args;
  $col-val: length($columns);
  
  @for $i from 1 through $col-val {
    .span-#{nth($columns, $i)} {
      width: ((100 / $col-val) * $i)*1%;
    }
  }
}

@include spans(one two three fopah five sikx);

SassMeister-output.css

.span-one {
  width: 16.66667%; }

.span-two {
  width: 33.33333%; }

.span-three {
  width: 50%; }

.span-fopah {
  width: 66.66667%; }

.span-five {
  width: 83.33333%; }

.span-sikx {
  width: 100%; }