Issue:
You use the Measure, Distance, or Area command and get a value that is not correct
Causes:
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
Example
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
Solution:
If you are using OSNAPS, then your best bet is to turn off the OSNAPZ:
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
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