Calculating Kerr black hole dimensions?

Follow-up to this previous question:

https://ca.answers.yahoo.com/question/index?qid=20...

Without having to go through all of the calculus, is there an equation (simple algebraic) to calculate the maximum and minimum oblate event horizon sizes of Kerr black holes. Same with its ergosphere.

Update:

What I mean by sizes, is just its max and min radii, not volume.

There are no answers yet.
Be the first to answer this question.