Not sure you can average putting i would say tournament pro would be 28 per round everyone else out a bit, what do you play off jp
Got the stats from Golf Digest, they did an article on it a few years ago.
I'm off 8 currently, have been as low as 6, but not putting any practise time in anymore. I'm a member at Brocket Hall, 2 courses, both quite difficult, with treacherous greens. I play 3 better, on average, at most of my buddies courses.
There was a really good article on putting a few issues ago in Golf Digest. It talked about a measuring system for putting that I thought was really useful. You take the footage of the putt that goes in the hole, count it as 2 if less than 2 feet, and subtract 4 feet for every 3 putt. So if you hole 74 feet of putts, and have 3 - 3putts, your total is 62.
0 Handicap = 70 feet of putts
5 Handicap = 62 ft
10Handicap = 57 ft
15Handicap = 51 ft
20Handicap = 48 ft
25Handicap = 40 ft
I tracked this for 50 rounds, and it's a decent reflection of your putting ability overall, and on the day.