How Do I Change the Default Line Thickness in AutoCAD?

How Do I Change the Default Line Thickness in AutoCAD?

AutoCAD is a powerful software tool used by architects, engineers, and designers to create precise drawings and models. One of the key aspects of a design is the line thickness used. In this tutorial, we will explore how to change the default line thickness in AutoCAD.

Step 1: Accessing the Layer Properties Manager

To change the default line thickness in AutoCAD, we need to access the Layer Properties Manager. You can do this by typing ‘LA’ or ‘LAYER’ in the command line and pressing Enter. Alternatively, you can find it under the Home tab in the Layers panel.

Step 2: Selecting a Layer

Once you have opened the Layer Properties Manager, you will see a list of layers in your drawing. Each layer has its own properties, including line thickness. Select the layer that you want to modify by clicking on its name.

Step 3: Modifying Line Thickness

After selecting a layer, you will see various properties associated with it, such as color, linetype, and lineweight. To change the default line thickness, locate the ‘Lineweight’ column and click on its current value.

Note: The lineweight values are represented in millimeters (mm).

Option 1: Choosing a Preset Lineweight

  • If you prefer using preset lineweights for your designs, simply select one from the drop-down menu that appears when you click on the current lineweight value.
  • The available options range from ‘Default’ (which uses a global lineweight) to various specific measurements like 0.05mm, 0.10mm, and so on.

Option 2: Customizing Lineweight

  • If you want to set a custom lineweight, select ‘Custom’ from the drop-down menu.
  • Enter your desired lineweight value in the text box that appears next to the drop-down menu.

Note: You can also use negative values for lineweights, which will result in thicker lines.

Step 4: Applying Changes

Once you have chosen or customized the lineweight, click ‘OK’ in the Layer Properties Manager to apply the changes. The selected layer will now use the new default line thickness for all objects drawn on that layer.

Tip: To change the line thickness for multiple layers, simply repeat steps 2-4 for each layer individually.


In this tutorial, we have learned how to change the default line thickness in AutoCAD. By accessing the Layer Properties Manager and modifying the lineweight of a specific layer, you can customize your drawings to meet your desired specifications. Whether you prefer preset options or want to set a custom lineweight, AutoCAD offers flexibility and control over your design elements.

We hope this tutorial has helped you enhance your AutoCAD skills and unleash your creativity in producing visually stunning drawings!