How would I reverse this equation?

I’m using this equation to convert steps to estimated calories lost.

I now need to do the opposite and convert total calories to estimated steps.

This is the equation I’m using for steps to calories: http://pastie.org/private/6oioyyeltnj9ogw5kq

It’s written in Objective-C, but I tried to make it as readable as possible.

Thank you for you help.

EDIT: The calculations will be over a 1 hour period.