ChartSize Property

From Microsoft Excel Visual Basic

XlObjectSize can be one of these XlObjectSize constants.
xlFitToPage. Print the chart as large as possible, while retaining the chart's height-to-width ratio as shown on the screen
xlFullPage. Print the chart to fit the page, adjusting the height-to-width ratio as necessary.
xlScreenSize. Print the chart the same size as it appears on the screen.