Turning Radius -- Can it be calculated/estimated?

You can measure distances on Google maps. I used that to figure out the best way to turn around at the back of my property down by my shop. For me it was helpful to have that overhead shot and then figuring out the distances between my outbuildings - for me the choke point was between a shop and storage shed. It is awesome to be able to pull in forward and turn around so I can pull it back out forward also.