score:8

Not sure yDecimals is working now. Seem to be tooltip.valueDecimals now.

Here what I'm using :

Highcharts.setOptions({
    lang: {
        decimalPoint: ',',
        thousandsSep: '.'
    }
});

And in the chart :

tooltip: {
    valueDecimals: 2 
},

score:17

Highcharts.setOptions({
    lang: {
        decimalPoint: ',',
        thousandsSep: '.'
    },

    tooltip: {
        yDecimals: 2 // If you want to add 2 decimals
    }
});

Demo

Reference


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