Simple calculations..... 10 ft. putt.....2 inches up.
Fast Green less 10 percent.........10 ft putt is now 9
Uphill putt plus 1 ft. per inch of rise......2 inches up is 2 ft.
9 ft. length plus 2 ft. for rise is an 11ft. putt.
It won't help with your aim....but it will get the speed pretty close.
You should be within range for your par putt.
Hope it helps.
Hac.