How Do I Open a CAL File in Autocad?

Opening a CAL file in AutoCAD can be a straightforward process if you follow the right steps. In this tutorial, we will guide you through the process of opening a CAL file in AutoCAD and explain what a CAL file is.

What is a CAL file?
A CAL file, also known as an AutoCAD Script File, is a plain text file that contains a series of commands that can be executed by AutoCAD. These commands are written in the AutoLISP programming language, which allows users to automate tasks and create custom commands within AutoCAD.

Step 1: Prepare your CAL file
Before opening the CAL file in AutoCAD, it’s essential to make sure that the file is properly prepared. Follow these steps to prepare your CAL file:

  1. Open your preferred text editor.
  2. Create a new text document.
  3. Copy and paste the series of commands into the new document.
  4. Save the document with a .cal extension (e.g.,

It’s crucial to ensure that each command is written on a separate line and ends with a semicolon (;). This formatting ensures that AutoCAD reads and executes each command accurately.

Step 2: Open the CAL file in AutoCAD
Now that you have your properly prepared CAL file, it’s time to open it in AutoCAD. Follow these simple steps:

  1. Launch AutoCAD on your computer.
  2. In the top menu bar, click on “Tools”.
  3. In the dropdown menu, select “Scripts” followed by “Run Script”.
  4. Navigate to where you saved your CAL file and select it.

Once you’ve selected your CAL file, click on “Open” or press Enter. AutoCAD will now execute each command within the CAL file, carrying out the desired actions.

Common Issues and Troubleshooting
While opening a CAL file in AutoCAD is usually a smooth process, you may encounter some issues along the way. Here are a few common problems and their solutions:

The CAL file is not visible in the “Open” dialog box

If you can’t see your CAL file when browsing for it in AutoCAD, make sure to change the “Files of type” dropdown menu to “Script Files (*.scr)”.

Error messages while running the CAL file

If you encounter error messages while executing your CAL file, double-check that each command is correctly formatted with a semicolon at the end. Also, ensure that any referenced files or variables are correctly located or defined.

Commands not working as expected

If your commands within the CAL file are not producing the desired results, review each command’s syntax and parameters. It’s possible that a small typo or incorrect argument is causing unexpected behavior.

Opening a CAL file in AutoCAD can be a powerful way to automate tasks and streamline your workflow. By following these simple steps and ensuring proper formatting of your CAL file, you can leverage AutoLISP commands to enhance your productivity within AutoCAD. Remember to troubleshoot any issues you may encounter by reviewing syntax, variables, and referenced files.