How to Add Aligned Dimension in AutoCAD Quickly

To add an Aligned Dimension in AutoCAD, use the DIMALI command or select the Aligned Dimension tool from the Dimension panel. Then click two points on your drawing to place the dimension aligned with those points.

Syntax

The basic syntax to add an aligned dimension in AutoCAD is:

• DIMALI - Command to start aligned dimensioning.
• First point - Select the first point of the object or line.
• Second point - Select the second point of the object or line.
• Dimension line location - Click to place the dimension line aligned with the selected points.

This creates a dimension that measures the distance between two points along the line connecting them.

autocad command

DIMALI
Select first extension line origin or <select object>:  (click first point)
Select second extension line origin:  (click second point)
Specify dimension line location or [Mtext/Text/Angle/Horizontal/Vertical/Rotated]:  (click to place dimension line)

Output

An aligned dimension appears between the two selected points, measuring the true length along the line connecting them.

Example

This example shows how to add an aligned dimension between two points on a diagonal line:

autocad command

DIMALI
Select first extension line origin or <select object>:  (click point at coordinates 2,3)
Select second extension line origin:  (click point at coordinates 8,7)
Specify dimension line location or [Mtext/Text/Angle/Horizontal/Vertical/Rotated]:  (click above the line to place dimension)

Output

An aligned dimension measuring the distance between points (2,3) and (8,7) is displayed, aligned with the diagonal line connecting them.

Common Pitfalls

Common mistakes when adding aligned dimensions include:

• Clicking points that are not on the same line, causing incorrect dimension alignment.
• Placing the dimension line too close or overlapping objects, making it hard to read.
• Using the wrong dimension tool (like linear instead of aligned) which measures horizontal or vertical distances only.

Always ensure points are on the line you want to measure and place the dimension line clearly.

autocad command

Wrong way:
DIMLIN
Select first point: (click first point)
Select second point: (click second point)
Specify dimension line location: (places horizontal dimension)

Right way:
DIMALI
Select first point: (click first point)
Select second point: (click second point)
Specify dimension line location: (places aligned dimension)

Output

Wrong way creates a horizontal dimension that may not represent the true length; right way creates an aligned dimension showing the true length.

Quick Reference

Step	Action	Description
1	Type DIMALI	Starts the aligned dimension command
2	Select first point	Pick the first point on the object or line
3	Select second point	Pick the second point on the object or line
4	Place dimension line	Click where you want the dimension line to appear
5	Adjust if needed	Modify dimension style or position for clarity

Key Takeaways

Use the DIMALI command to add aligned dimensions that measure true length along a line.

Always select two points on the same line to ensure correct alignment.

Place the dimension line clearly to avoid overlapping with drawing elements.

Avoid using linear dimension tools for angled lines to get accurate measurements.

Use the Dimension panel in the ribbon for quick access to aligned dimension tools.