Rounding results in highcharts jquery script

In in the tooltip option in the configuration object use Math.round() in the formatter function.

   tooltip: {     formatter: function() {        return '<b>'+ this.point.name +'</b>: '+ Math.round(this.percentage) +' %';     }  },

tooltip: {  valueDecimals: 2},

There's a numberFormatfunction available in the Highcharts API that you can use (see http://www.highcharts.com/ref/#highcharts-object).

Quoted from API doc:

numberFormat (Number number, [Number decimals], [String decimalPoint], [String thousandsSep]) : String

Formats a JavaScript number with grouped thousands, a fixed amount of decimals and an optional decimal point. It is a port of PHP's function with the same name. See PHP number_format for a full explanation of the parameters.

tooltip: {    formatter: function() {        return ''+ this.series.name +''+            this.x +': '+ Highcharts.numberFormat(this.y, 0, ',') +' millions';    }}, ...

Parameters

• number: NumberThe raw number to format.
• decimals: NumberThe desired number of decimals.
• decimalPoint: StringThe decimal point. Defaults to "." or to the string specified globally in options.lang.decimalPoint.
• thousandsSep: StringThe thousands separator. Defaults to "," or to the string specified globally in options.lang.thousandsSep.

Returns

A string with with the input number formatted.