This info comes from the Ritson School of Golf I am going to give it a shot to see how it works out with my game. That is in a couple of months when my right hand has healed up properly. FHs
"I define "Short Game" as all shots played inside of 50 yards of the green. So your "Short Game Handicap" indicates your proficiency in that area.
Each time you have a shot within 50 yards of the green, without actually being on the green, count how many shots it takes to get the ball in the hole. Mark this down on your scorecard. If you fluff or scull a shot that does not finish on the green, those shots must still be counted. So if you are within 50 yards of the green, and your pitch comes up short of the green, you scull your chip over the green, you chip your next one on the green and you two putt, your short game handicap for that hole would be 5.
For a further example, if, on the first hole I hit my drive and second shot to within 50 yards of the green, and then pitched on and one putted, my short game handicap would be two for that hole.

C, P & B = Chips, Pitches and Bunker shots.
SGS = Short Game Score.
On the next hole I hit a five iron from 190 yards onto the green and two putted for par. As I did not have any short shots around the green this hole does not figure into my Short Game Handicap.
How to Calculate Your "Short Game Handicap"
As you see on the scorecard I scored 35 for 9 holes. had 3 chips, 1 bunker shot and 2 pitches. . To calculate my short game handicap I add up the number of strokes I took from within 50 yards (see SGS on scorecard above) which is 13, and divide it by 6 (the number of holes I had to chip, pitch or play out of sand) to get my final short game handicap for this nine holes which is 2.16. You would then do the same for the second nine to finally determine your Short Game Handicap for the full 18 holes. Do this each time you play to keep track of your progress.
If your regular golf handicap is 20 or higher, you should be aiming at a short game handicap of 3. Between 19 and 12 you should be about 2.75, and below a 12 you should have 2.5 or better.
If your short game handicap is higher than these figures - get to work on your chipping, pitching and bunker shots.
If it's lower - think about joining the tour!"