Measure, Distance, and Area commands not giving correct values

May 31, 2021 Ryan Wunderlich

You use the Measure, Distance, or Area command and get a value that is not correct


This problem is usually because you have items at different Z elevations, and are using Object Snaps (OSNAPS) to select start and end points with different Z Values

A linear dimension between the two points (red circle) shows 6.000 units

However, when I use the distance command between them, I get this:
Specify first point:
Specify second point or [Multiple points]:
Distance = 6.7082,  Angle in XY Plane = 0,  Angle from XY Plane = 27
Delta X = 6.0000,  Delta Y = 0.0000,   Delta Z = 3.0000

This is because the right square is at a Z elevation of 3, and the left square is at a Z elevation of 0

If you are using OSNAPS, then your best bet is to turn off the OSNAPZ:
Controls whether object snaps are automatically projected onto a plane parallel to the XY plane of the current UCS at the current elevation.

Value    Description
0        Osnap uses the Z -value of the specified point
1        Osnap substitutes the Z -value of the specified point with the elevation (ELEV) set for the current UCS 

This is NOT saved, so each time you open a new drawing or close and re-open AutoCAD, you will need to change this value back  

About the Author

Ryan Wunderlich

Sr. Technical Support Specialist<br><br>An AutoCAD Certified Professional, Ryan is responsible for taking client cases and assisting with issues with the software - everything from regular glitches to software deployments and whatever else goes wrong. He's proficient in AutoCAD (including customization), VBA, LISP, and Civil 3D.

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