RadChart has been replaced by RadHtmlChart, Telerik's client-side charting component. If you are considering RadChart for new development, examine the RadHtmlChart documentation and online demos first to see if it will fit your development needs. If you are already using RadChart in your projects, you can migrate to RadHtmlChart by following these articles: Migrating Series, Migrating Axes, Migrating Date Axes, Migrating Databinding, Features parity. Support for RadChart is discontinued as of Q3 2014, but the control will remain in the assembly so it can still be used. We encourage you to use RadHtmlChart for new development.
Chart margins are the distances from the outermost chart borders to the borders of the plot area.
Margins are expressed in the RadChart PlotArea.Dimensions.Margins property and are specified in pixels or percentages. Percentages refer to a percentage of the RadChart width. In the figure below the dimensions are populated with some values in percentages, some in fixed pixels.
To provide extra space for positioning legends, labels and title, use greater margin values for the PlotArea to provide room.