Overall dimensions compared to build size

Hello all, I’m almost ready to build my first MPCNC but I have a question about overall machine size. I’m putting together plans to build my table out of steel but I want to make sure I leave plenty of room on the table for the machine and other odds and ends. Is there a measurement available of how much to add to your table compared to your working width? for example, a 12"x 12" X and Y working width makes the machines overall outer dimension of 15.75" square. I hope this question makes sense and I appreciate the help!

Yes, there are calculators in both imperial and metric. Found on the parts and conduit pages.