How to figure out an rti ramp score????

I was wondering if any of you knew how. I pulled 81 inches on a 23 degree ramp with my XJ. I was just curious at what the score was because I am going to do it again with my new lift and see how much more I really got out of it.

take how far you made it divided by your wheelbase than multiply that by 1000 so (81/101)x1000=801.98