Tourney pro greens- I takes the distance and figure in the elevation. If up, I add the inches and down I subtract them. Then I subtract %30. So a 30 foot putt, up 6 inches would be 30+6(%30) = 36 x .30=10.8 then 36-10.8= 25.2 foot putt, so I would hit 26 ish. Now Legend I do the same except I go with%35. Sounds complicated but everything can be done in your head and then if it is a big number, just use a calculator and multiply the %. Now the uphill and downhill people asre talking about I am sure is correct but that is getting too complicated for me. But if going up hill a great distance, i add a lil pep 2 it, and down I take a lil off. If you practice this a bit, u can get pretty good with it. The most important thing is to calculate your elevation.