- On the ribbon, click
Sketch tab
Constrain panel
Dimension
. - In the graphics window, click the geometry to dimension.
- Click in the graphics window to place the dimension. In a 3D sketch, the dimension text is parallel to a plane created by the two selections.
- If the Edit Dimension option is enabled, the Edit Dimension box is displayed. Specify a value, use an equation to calculate the value, or click the arrow to measure the value, show dimensions, or set a tolerance. Tip: You can also enter or edit an expression that defines a parameter. For example, enter HGHT = 5mm. The expression is parsed to create the parameter HGHT and assign it a value of 5 mm.
- Continue selecting geometry to create dimensions or right-click then select OK to end the command.
Note: If the dimension overconstrains the sketch, you can accept it or cancel the dimension. If you accept the dimension, it is saved as a
driven dimension
. Driven dimensions are displayed in parenthesis and cannot be edited.
Click 
Options to access the Application Options dialog box, and then click the Sketch tab to set preferences for placing overconstrained dimensions and editing a dimension when it is placed.
Show Me how to add and edit dimensions
Show Me how to create an aligned dimension
Show Me how to dimension a straight line
Show Me how to create a linear dimension between two objects
Show Me how to create an interior angular dimension
Show Me how to create an exterior angular dimension
Show Me how to create an angular dimension from a reference line
Show Me how to create a three-point angular dimension
Show Me how to create a diameter dimension
Show Me how to create a radial dimension
Show Me how to dimension to a centerline
Show Me how to use driven dimensions