Generated by SassMeister.com.

SassMeister-input.scss

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

$font-base: 16;

@mixin font-size($size: 1.6, $line: $size * 1.5){
    font-size:   ceil($size / $font-base) + rem;
    line-height: ceil($line / $font-base) + rem;
    font-size:   $size + px;
    line-height: $line + px;
}

.foo {
  @include font-size(12);
}

.bar {
  @include font-size(14);
}

.baz {
  @include font-size(16);
}

SassMeister-output.css

.foo {
  font-size: 1rem;
  line-height: 2rem;
  font-size: 12px;
  line-height: 18px;
}

.bar {
  font-size: 1rem;
  line-height: 2rem;
  font-size: 14px;
  line-height: 21px;
}

.baz {
  font-size: 1rem;
  line-height: 2rem;
  font-size: 16px;
  line-height: 24px;
}