Convert autocad Drawings from mm to inch or vice vera

If you have a drawing in Imperial units and want to convert it to Metric, changing the dimension primary units is not gonna work ass the actual length between any two line won't change. You'll have to scale the drawing with a factor that increases the drawing size.

There are 3 different ways to do it, as mentioned in Cad-Notes

Scale the drawing manually
Create a new drawing with your preferred unit, then insert/bind your drawing there.
Using DWGUNITS tool for Autocad 2009 & later.

Scaling Manually

Inch to mm

To manually scale a drawing from inch to mm, you have to select all the objects you want to scale & choose a base point & specify the scale factor as 25.4

mm to inch

To manually scale a drawing from mm to inch, you have to select all the objects you want to scale & choose a base point & specify the scale factor as 0.0393.

Explanation

We know that to convert a drawing from mm to m, you have to scale it by 0.001(1/1000) as 1m=1000mm. So, to convert a drawing from mm to inch, we need to scale the drawing by a factor that converts 1mm to 1 inch and you can find that 1inch = 25.4mm. so to convert 1inch into its equivalent metric size, we need to scale 25.4 times.

similarly to scale a drawing from mm to inch, we need to convert 1mm to its equivalent inch(Imperial) size. So, scaling the drawing by 0.0393(1/25.4) times would do the work.

Inserting as Block

Inch to mm

Create a New Drawing and set the units to mm, Use the insert command to select the drawing you wish to convert, In th prompt window select the drawing tha is in inch and you can see that AutoCAD automaticallt scales the drawing by 25.4, to convert it from inch to mm. Now you can just insert the block and explode it if you wish or keep working on it.

mm to inch

The same process can be replicated in converting mm to inch

Using DWGUNITS tool

This tool uses the command line to specify the units requirements. This is pretty lengthy process and might be confusing too, with lot of prompt options

Cad-Notes Link

Comments

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