AutoCAD reports the area in the units you are using, it doesn't know or care
what those units are. If you say the units are millimeters, then that's the
area you get, it you say the units are miles, then that's the area you get,
etc., etc. You just need to write a small macro to convert the square
millimeters that AutoCAD reports into square meters.
If the drawing has been done with millimetres as the drawing unit then
the answer will be in square millimetres. To get the answer in metres,
you would have to scale the drawing down by 1000 so that it was drawn in
metres. AutoCAD only understands drawing units. The only exception is
that if you enter a distance with an apostrophe, then AutoCAD guesses it
is feet and multiplies the number by 12.
I have the same problem. I've always worked in metres and now I've been detached
to a place where they work in
milimetres, but for measurements they need metres and square metres. Sometimes
even in acres.
I think they only way to deal with is to write a lisp routine that divides the
result by 1000 or 1000 000.
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