For the electrical wise out there, is there a device that will measure the electrical current drawn, being used, by something like a DC?

I currently run my DC as needed when I turn my saw of planer on. My DC is a 1.5HP 110v unit.

I'm getting quotes for adding an extra bay to my current 30'x 30' garage, making it 44' x 30'. If this happens, I will most likely re-duct my entire shop and go with a much more powerful DC, 3HP or 5HP.

I'm about to get a small hobbyist CNC which will require me to run the DC for several hours at a time.

So I'm trying to figure out what is my best approach for chip/dust collection for the CNC. Is it a 220v 3 to 5HP DC, or my 1.5HP 110v DC, or maybe a stand alone shopvac.

And back to my opening question, I'm trying to figure out what the cost of running the CNC is likely to be.

Thanks