How Do You Lock Dimensions in AutoCAD?

In AutoCAD, it is essential to have precise and accurate dimensions for your designs. However, sometimes you may accidentally move or modify an object, causing its dimensions to change. To prevent this from happening, you can lock dimensions in AutoCAD.

Locking Dimensions

To lock dimensions in AutoCAD, follow these steps:

  1. Select the objects: First, select the objects whose dimensions you want to lock. You can do this by clicking and dragging a selection box around the desired objects or by selecting them individually.
  2. Access the Properties panel: Once the objects are selected, go to the Properties panel by pressing Ctrl+1 on your keyboard or by clicking on the Properties icon located in the Home tab of the Ribbon.
  3. Find the Lock option: In the Properties panel, locate the Lock option.

    It is represented by a padlock icon.

  4. Enable dimension locking: Click on the Lock icon to enable dimension locking for the selected objects. When locked, you will notice that a small padlock symbol appears next to each dimension associated with those objects.

Note: Locking dimensions in AutoCAD prevents accidental changes but does not disable them completely. You can still modify locked dimensions by unlocking them temporarily.

Unlocking Dimensions

If you need to make changes to locked dimensions, follow these steps:

  1. Select locked objects: Select one or more objects with locked dimensions that you want to unlock.
  2. Navigate to Properties panel: Access the Properties panel using Ctrl+1 or by clicking on the Properties icon.
  3. Unlock dimensions: In the Properties panel, find the Lock option represented by a padlock icon. Click on it to disable dimension locking for the selected objects.

Note: By default, all new objects you create in AutoCAD will have unlocked dimensions. You need to manually lock them if required.

Benefits of Locking Dimensions

Locking dimensions in AutoCAD offers several advantages:

  • Precision: By locking dimensions, you can maintain precise measurements and prevent accidental modifications that may compromise your design’s accuracy.
  • Consistency: Locked dimensions ensure consistency throughout your drawing, making it easier to maintain a standardized layout and avoid discrepancies.
  • Ease of editing: When you need to modify other elements or add new objects to your drawing, locked dimensions allow you to do so without unintentionally altering existing measurements.


In AutoCAD, locking dimensions is a valuable technique that helps maintain accuracy and consistency in your designs. By following the steps outlined above, you can easily lock and unlock dimensions as needed. This ensures that your drawings remain precise and free from inadvertent changes, saving you time and effort in the long run.