How to bend electrical conduit to desired shape

So i need to bend a 1'' electrical conduit into a U shape. And the U needs to fit precisely into a different pipe. I tried several times with some basic math to do this and i am always wide in my shape. I tried several guides on how to do this and still my bends are over shooting the desired U.

Is there a formula on how to do this. I know one of the guides talked about using the reverse bend and placing the star onto the needed length, but this still gives me a wider U then what i need.

With trial and error i can get this done, but i'm getting tired of wasting pipe. Thanks for your help.