series.size Number

The or radius of the chart donut series in pixels. If not set, the available space is split evenly between the series.

Example - set the donut chart series size

<div id="chart"></div>
<script>
$("#chart").kendoChart({
  series: [ {
    type: "donut",
    size: 100,
    data: [ 1, 2, 3]
  }]
});
</script>