columns.aggregates Array

The aggregate(s) which are calculated when the grid is grouped by the columns field. The supported aggregates are "average", "count", "max", "min" and "sum".

Example - set column aggregates

<div id="grid"></div>
<script>
$("#grid").kendoGrid({
  columns: [
    { field: "firstName", groupable: false },
    { field: "lastName" }, /* group by this column to see the footer template */
    { field: "age",
      groupable: false,
      aggregates: [ "count", "min", "max" ],
      groupFooterTemplate: "age total: #: count #, min: #: min #, max: #: max #"
    }
  ],
  groupable: true,
  dataSource: {
    data: [
      { firstName: "Jane", lastName: "Doe", age: 30 },
      { firstName: "John", lastName: "Doe", age: 33 }
    ]
  }
});
</script>

Check Aggregates for a live demo.