This also works if you want to convert imperial to metric

We often get requests to convert an architectural or engineering CAD drawing from metric to imperial measurements. Converting from metric to imperial in AutoCAD is easier than you might think. This may seem complicated, but it really isn’t. There are a few quick commands that makes it pain free. There are two methods to accomplish this.

Using the INSERT command:

1. Create a new blank drawing using a template that is in the target units (for example acadiso.dwt for Metric or acad.dwt for Imperial).
2. At the command line, enter INSERT.
3. In the Insert dialog box, browse to the original DWG file.
4. Check the box to Explode.
5. Click OK and specify an insertion point.

Using the SCALE command:

1. At the command line, enter SCALE.
2. At the Select objects prompt, enter All, then hit Enter.
3. Enter 0,0 for the base point.
4. When prompted for scale factor, enter the appropriate scale factor for the units to be converted, based on the following list:

Scale Factors:

Inches to Millimeters = 25.4
Millimeters to Inches = 0.0393701

Inches to Centimeters = 2.54
Centimeters to Inches = 0.393701

Feet to Millimeters = 304.8
Millimeters to Feet = 0.00328084

Feet to Centimeters = 30.48
Centimeters to Feet = 0.0328084

Note: For the SCALE command method, adjust the dimension text and arrowhead height in the dimension style as needed.

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Source: Autodesk.com