How Do I Convert Splines to Arcs in AutoCAD?

Converting Splines to Arcs in AutoCAD

AutoCAD is a powerful tool used by architects, engineers, and designers to create precise and detailed drawings. When working with complex curves, you may find yourself needing to convert splines to arcs for various reasons. In this tutorial, we will explore the process of converting splines to arcs in AutoCAD.

Step 1: Select the Spline

To begin, open your AutoCAD drawing that contains the spline you wish to convert. Use the selection tool to select the spline by clicking on it. The selected spline will be highlighted.

Step 2: Access the Modify Tab

Navigate to the Modify tab located at the top of the AutoCAD interface. Click on it to access additional commands and tools.

Step 3: Find ‘Explode’ Command

In the Modify tab, locate and click on the ‘Explode’ command. This command allows you to break down complex objects into simpler components.


Before proceeding with this step, it is important to note that once you explode a spline, it cannot be converted back into a spline. Therefore, it is recommended that you make a backup copy of your drawing before proceeding.

Step 4: Choose ‘Arc’ Option

After executing the ‘Explode’ command, you will notice that the selected spline has been converted into individual segments. Now, select one of these segments using the selection tool.

In your AutoCAD workspace, find and click on the ‘Arc’ option located in one of two places:

  • Ribbon: The ‘Arc’ option can be found in either the Home or Draw tabs of the AutoCAD ribbon. Look for an icon representing an arc.
  • Command Line: Alternatively, you can access the ‘Arc’ command by typing ‘arc’ into the command line located at the bottom of the AutoCAD interface. Press Enter to execute the command.

Step 5: Define Arc Parameters

After selecting the ‘Arc’ option, you will be prompted to define the parameters of your arc. AutoCAD will ask you to specify three points:

  1. Start Point: Click on one end of the segment you selected in Step 4 to define the starting point of your arc.
  2. Endpoint: Click on the other end of the segment to define the endpoint of your arc.
  3. Third Point: Finally, click on any point along the curve to determine how your arc will bend.

Note that there are additional parameters you can adjust for more control over your arc, such as radius and angle. However, for a basic conversion from spline to arc, defining these three points should suffice.

Step 6: Repeat for Remaining Segments

To convert all segments of your original spline into arcs, repeat Steps 4 and 5 for each individual segment. By doing so, you will gradually replace all splines with arcs throughout your drawing.

Congratulations! You have successfully converted splines to arcs in AutoCAD.

Remember that this process is irreversible, so it is important to make a backup copy of your drawing before proceeding with any modifications. With this newfound knowledge, you can now confidently work with complex curves and achieve greater precision in your designs!