You can select a single unit of measurement to specify various distance values of a workbook (such as column width, row height and page margins). To do this, set the Workbook.Unit property.
Unit of Measurement
How to Use
Document (1 document unit is equal to 1/300 of an inch). This is a default measure unit of a workbook.
Set the Unit property to DocumentUnit.Document.
Centimeter (1 inch is equal to 2.54 centimeters)
Set the Unit property to DocumentUnit.Centimeter.
Millimeter (10 millimeters are equal to 1 centimeter)
Set the Unit property to DocumentUnit.Millimeter.
Set the Unit property to DocumentUnit.Inch.
Point (1 inch is equal to 72 points)
Set the Unit property to DocumentUnit.Point.
Pixel (1 inch is equal to 96 pixels). You can use this unit to set column width.
Use the following properties to set column width in pixels.
Character (the width of the zero character in the font specified by the built-in Normal style). You can use this unit to set column width.
Use the following properties to set column width in characters.
A workbook's units of measurement specified by the Unit property are used in the following cases.