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

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

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# chart.height

An explicit height for the chart. If a number, the height is given in pixels. If given a percentage string (for example `'56%'`), the height is given as the percentage of the actual chart width. This allows for preserving the aspect ratio across responsive sizes.

By default (when `null`) the height is calculated from the offset height of the containing element, or 400 pixels if the containing element's height is 0.