What's the formual to figure out my DCR? Is there a desktop dyno for that?

Compliments of Pat Kelley! DCR calc. (http://members.uia.net/pkelley2/DynamicCR.html)

Thanks for the link. I realy need that calculator.I checked out the cam I picked (286H) and came out with a DCR of 7.89. So I'm happy.