# Welcome to the Highcharts Gantt JS (gantt) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

Feel free to search this API through the search bar or the navigation tree in the sidebar.

# yAxis.max

The maximum value of the axis. If `undefined`, the max value is automatically calculated.

If a datetime string is passed, it is parsed into epoch time according to the time zone given in time.timezone.

If the endOnTick option is true, the `max` value might be rounded up.

If a tickAmount is set, the axis may be extended beyond the set max in order to reach the given number of ticks. The same may happen in a chart with multiple axes, determined by chart. alignTicks, where a `tickAmount` is applied internally.