Simple LESS Grid Calculator

gistfile1.css

#grid {
    
    /* Consult http://gridulator.com for viable grids */
    @totalColumns: 12;
    @siteWidth: 960px;
    @margin:	10px;

    .container() {
        margin-left: auto;
        margin-right: auto;
        width: @siteWidth;
    }
    
    .columns(@columnNumber, @float:left) {
        display: inline;
        float: @float;
        margin-left: @margin / 2;
        margin-right: @margin / 2;
        width: ((@siteWidth / @totalColumns) * @columnNumber) - @margin;
        .clearfix();
    }
}

.container {
    #grid > .container();
}

.content {
    #grid > .columns(8);
}

.sidebar {
    #grid > .columns(4);
}