Why Are My Dimensions Wrong in AutoCAD?

Why Are My Dimensions Wrong in AutoCAD?

If you have ever worked with AutoCAD, you may have encountered the frustrating issue of incorrect dimensions. This can be a major setback, especially when accuracy is crucial to your design. In this article, we will explore some common reasons why dimensions can go wrong in AutoCAD and how to troubleshoot them.

1. Incorrect Units

One of the most common causes for incorrect dimensions in AutoCAD is using the wrong units. AutoCAD allows you to work with different units such as inches, millimeters, or feet. If your drawing’s units do not match the real-world measurements you are trying to represent, your dimensions will be inaccurate.

To check and adjust the units in AutoCAD:

  1. Select the “Units” command from the “Format” menu.
  2. In the “Drawing Units” tab, ensure that the “Type” matches your desired unit (e.g., decimal for inches).
  3. Verify that the other settings such as precision and scale are also appropriate for your project.

2. Scale Factors

Another common reason why dimensions may appear incorrect is due to scale factors. When working with large or small-scale drawings, a scale factor must be applied to accurately represent real-world measurements on paper or screen. For example, if you are creating a floor plan for a building and using a 1:100 scale, every dimension should be multiplied by 100 to reflect the actual size.

To apply or adjust scale factors in AutoCAD:

  1. Select all objects that need scaling by either selecting them individually or using selection tools such as “Window” or “Crossing”.
  2. Type the “Scale” command or use the shortcut “SC” and press Enter.
  3. Enter the desired scale factor, such as 2 for doubling the size or 0.5 for halving it.

3. Object Snapping

Object snapping is a useful feature in AutoCAD that allows you to precisely align objects and dimensions. However, if object snapping is not properly configured, it can lead to incorrect dimensioning.

To check and adjust object snapping settings:

  1. Select the “Object Snap” button in the status bar at the bottom of the AutoCAD window.
  2. In the Object Snap Settings dialog box, ensure that relevant options such as “Endpoint,” “Midpoint,” and “Intersection” are selected.
  3. If necessary, adjust other settings like snap spacing and object snap tracking to suit your needs.

4. Annotation Scale

If your dimensions appear correct in model space but wrong in paper space, it could be due to an incorrect annotation scale. Annotation scale determines how objects, including dimensions, are displayed when plotted or printed at different scales.

To adjust annotation scale:

  1. In the layout tab, double-click inside the viewport where your dimensions are incorrect.
  2. In the properties palette, locate and adjust the annotation scale until your dimensions appear correctly within the viewport.


In conclusion, incorrect dimensions in AutoCAD can be caused by various factors such as incorrect units, improper scaling, object snapping issues, or annotation scale mismatches. By understanding and troubleshooting these common problems, you can ensure accurate and precise dimensions in your AutoCAD drawings.

Remember to always double-check your units, apply appropriate scale factors, configure object snapping settings, and adjust annotation scale when necessary. With a little attention to detail and the proper use of AutoCAD’s features, you can eliminate dimensioning errors and create precise designs with ease.