It uses nothing more than how much power it takes to propel said weight to a said mph in 1320 ft. It really is that simpleSo, if you wanted to know how much flywheel hp you launched with, or you would need to perform a particular 60 foot time, or how much hp you had through the 1-2 shift, or what the hp level is at the 1000 ft mark, how does your calculator come up with that?