If you use the [LessFramework](http://lessframework.com/ http://lessframework.com/) (now v4) you'll find yourself doing these calculations and I'm pretty sure t

If you use the [LessFramework](http://lessframework.com/ http://lessframework.com/) (now v4) you'll find yourself doing these calculations and I'm pretty sure that if your using Less, Sass, or Stylus you've got width/col mixins too.