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Dimensions Video: SketchUp Toolbar Series
To view the full tool set, turn on the "Large Tool Set".
You can add dimensions to your model in SketchUp with the Dimension Tool.
Click the 2 end points, move the cursor away, and click to finish.
You can also click directly on an edge to dimension it.
When using an edge, make sure you are in the right context.
We can't dimension from this edge, because it is part of a Group.
By editing the Group, we can now dimension from the edge.
You can choose several directions for dimensions.
Measuring between these 2 points can give different results.
Going in the red direction,
in the green direction,
or in the blue direction.
We can also dimension in a perpendicular direction.
You can dimension the radius of an arc,
or the diameter of a circle.
Any dimensions you place are linked to the model.
Notice how the dimensions update while I change the model.
To override this behavior, double-click on a dimension and type a new value.
Now that dimension will remain the same.
To return the value to a dynamic one,
double-click on it, delete it, and press Enter. Now it is reset to adjust to the model.
Go to "Window" > "Model Info" to control dimension settings.
Then go to "Dimensions" on the left side.
Here you can change settings like font, color, and end points.
Just select the dimensions, make the changes,
and click on "Update selected dimensions".
You can change all dimensions at the same time.
Choose "Select all dimensions", then make the changes.
Dimensions will align to the screen by default.
You can choose to align them above,
centered,
or outside the dimension line.
There are additonal options in "Expert dimension settings".
Here you can toggle radius and diameter prefixes.
You can adjust the options to hide dimensions when they become foreshortened or too small.
If you have overriden the dimensions, you can highlight those changes here.
Units of your dimensions correspond to those chosen in "Model Info".
To change them, go to "Units".
Visit Google's 3D Warehouse to find examples you can follow in SketchUp.