Metric mode Vs US mode

Switch modes from the Options menu or the Status Bar

You can draw in feet & Inches or in metric mode.

The program is designed to be used in one mode or the other. 

You should not mix modes in any one drawing.

Metric and US modes use a different scale. If that were not the case, 

each screen pixel would have to represent a difficult distance. You 

would have to move in increments of odd millimeters, or fractions of 

an inch. 

In Metric mode, each pixel represents 25 mm in the default drawing 

size.  In US mode, each pixel represents one inch in the default 

drawing size. 

If you just want to know what the true conversion would be, press the F9 key.

That will convert dimensions without changing modes.