less mixin to convert px to em/percent step-4

mixin-convert-px-to-em-percent-step-4

#convert-px {
  .calc(@px; @context; @multiply) {
    @ret-convert-px:(@px/@context)*@multiply;
  }
  .em(@tag; @px; @context) {
    .calc(@px, @context, 1);
    .apply(font) { font-size:  @ret-convert-px + 0em; }
    .apply(padding) { padding:  @ret-convert-px + 0em; }
    .apply(@tag);
  }
  .percent(@tag; @px; @context) {
    .calc(@px, @context, 100);
    .apply(font) { font-size:  @ret-convert-px + 0%; }
    .apply(padding) { padding:  @ret-convert-px + 0%; }
    .apply(@tag);
  }
}
.myclass1 {
  #convert-px > .em(font,16,16);
}
.myclass2 {
  #convert-px > .percent(padding,8,16);
}

gist from blog post