5Gs Handicap Calculation Information
Originally written 1/22/02 
Revised 1/27/04 (added shaded red section at bottom)
Revised 3/16/04 to explain adj. to Women's Course handicaps - see Q7
Revised 1/19/05 to correct formula error for Slope Differencial - see Q10
Revised 10/23/07 to correct error in Table 2, change contact information, and broaden Q3 to include golf league history other than just Motorola leagues.
Revised 8/3/11 to update email addresses in document and dates in answer to Q4.
Revised 9/25/12 to update email addresses in document and dates in answer to Q4.
The league has had a number of questions from guests and members asking how 
HANDICAPs are calculated in 5Gs league.    This NEWs item addresses 
answers to the most frequently asked questions and gives some basic  
information on the method used to calculate HANDICAPs.
Q1.   How many rounds do I have to play to get a Handicap in 5Gs?
Answer:   After joining the league a member establishes a Handicap 
after only 1 round of play in 5Gs.    NOTE:  USGA rules require 5 rounds
to establish a Handicap,  but 5Gs handicaps are NOT USGA handicaps.
Q2.   What if I decide to join the league after I played several rounds as a
guest.    Can I use my GUEST rounds history to establish a Handicap?
Answer:   Yes,  rounds played as a guest are used to set up a Handicap
after joining the league.
Q3.   I am a member of another golf league.  Can I use my play history in that 
league to establish a Handicap in 5Gs?
Answer:   Yes,  5Gs accepts round history played in another golf 
league.   However,  you must request the other league's handicap officer to
email your detailed round history directly to:   [email protected]
This information will be used to help establish an equitable handicap for use in 5Gs
tourneys, taking into account the effect of the special rules the 5Gs uses for
league play and any ambiguities in the other league's handicap procedure.
Q4.   How long does 5Gs keep round history used in the handicap 
Answer:   At the beginning of each year 5Gs purges all round history in a
in a players file that is older than 2 years.    Thus in Jan 2012 all history for
year 2009 was purged from players records.    This includes play history
for people who transferred in rounds from another league to set up their 
handicap.   The next purge will occur in Jan 2013 with year 2010
data being deleted.  The idea is to keep only current play history which should
result in more accurate handicaps.
Q5.   Are players handicaps posted on the 5Gs web site?
Answer:   Yes,  Handicap Indexes for all Active and Inactive Members are posted.
Go to the HOME page and click on the ICON labeled Member Information
 & Statistics.
Q6.   My handicap Index on the web site doesn't match the handicap you
have me listed for on the TEE TIME posting.   Shouldn't they be the same?
Answer:   A player has a basic handicap which is called a Handicap
INDEX.   He only plays to this handicap when he is playing a golf course
rated as average difficulty.   An average difficulty golf course
is by definition a golf course with a SLOPE rating of exactly 113.
If he plays a golf course that has a HIGHER or LOWER slope rating than 
113 then a second handicap is generated called a COURSE Handicap.
The COURSE Handicap will be higher than the Handicap INDEX if the 
golf course has a HIGHER SLOPE rating than 113.   The reverse 
is true if the golf course has a LOWER SLOPE rating than 113.   We use
a player's COURSE Handicap when we run tournaments.   Both handicaps
are rounded down to the nearest 1/10 of a point,  (example: 10.495 
would be 10.4).   The formula used to convert from a Handicap INDEX
to a COURSE Handicap is as follows:    
Course Handicap = (Handicap Index) x (Slope of G.C. / 113)
Q7.   Usually Men & Women play from different TEE BOXES that have different
SLOPES and RATINGS.  Is there any adjustment made when calculating the 
COURSE HANDICAPS to allow for this condition?
Answer:  Yes,  5Gs uses a Course Handicap adjustment method based on 
the USGA adjustment method.
This method is as follows:  First, the Mens & Womens Course Handicaps are 
calculated using the formula described in Q6 (above).    Next,  the Difference
between the Men's & Women's Course Ratings is calculated.   If the Women's 
Rating is BIGGER than the Men's Rating the DIFFERENCE is ADDED to
each Woman's Course Handicap (as calculated in Q6).   However,  if the
Women's Rating is SMALLER than the Men's Rating the DIFFERENCE is
SUBTRACTED from each Woman's Course Handicap (as calculated in Q6).
Q8.   I am playing in a golf event where they require a player to have
a USGA handicap or the scores from their last 20 rounds.    Will 5Gs provide
my last 20 rounds of history so I can play in this event?
Answer:   5Gs will provide to you the last 20 rounds of your 5gs play 
history or whatever we have on file up to 20 rounds.   Please give a two week
notice to provide this information.     
Email your request to:  [email protected]    
Q9.   Is my handicap based on my Gross (actual) or Net Scores?
Answer:  Your handicap is calculated using your ADJUSTED GROSS
scores.    This is a term created by USGA and utilizes a method called
equitable stroke control to adjust your ACTUAL score down to an
ADJUSTED GROSS score.    The method used depends on the
COURSE Handicap you played under for that round of golf.
Your ADJUSTED GROSS score for a round of golf is the sum of your hole
scores after all hole scores have been adjusted to meet the requirements
shown below.
Course   Formula used to determine your ADJUSTED
Handicap   GROSS score after a round of golf.  
0 - 9.9   The worse score a player can use for any hole
    score is a Double Bogey    
10 - 19.9   The worse score a player can use for any hole
    score is a 7      
20 - 29.9   The worse score a player can use for any hole
    score is a 8      
30 - 39.9   The worse score a player can use for any hole
    score is a 9      
40 - 49.9   The worse score a player can use for any hole
    score is a 10      
The adjusted gross scores are only used to re-calculate your
handicap index after your round.    For tournaments you should
turn in your scorecard showing your ACTUAL scores.   
Q10.   What is the formula 5Gs uses to calculate a Handicap Index?
Answer:   The formula changes depending on how many rounds of history
you have.
Example 1:  Player has 20 or more rounds of history.
First Calculations:
For each of the last 20 rounds a player has the following calculations
a) Calculate a DIFFERENTIAL = Adj. Gross Score - Course Rating
b) Calculate a SLOPE DIFFERENTIAL = (Differential * 113)/Slope Rating
Last Calculations:
Then the lowest 10 rounds of SLOPE DIFFERENTIALS are averaged and 
the result is multiplied by .96.    This number is then rounded down to the 
nearest tenth of a digit.    This number is your Handicap Index unless you
have less than 5 rounds with 5gs over the last rolling 12mo. period. 
If less than 5 rounds applies to your case go to the shaded red area at the
bottom of this section.
Example 2:  Player has less than 20 rounds
Step 1:
Determine how many rounds of golf will be used in the handicap calculations
shown in example 1 above.
Number of rounds Number of rounds    
player has on file used in handicap    
 1-6     use only the lowest round  
 7-8     use the lowest 2 rounds  
 9-10     use the lowest 3 rounds  
 11-12     use the lowest 4 rounds  
 13-14     use the lowest 5 rounds  
 15-16     use the lowest 6 rounds  
 17     use the lowest 7 rounds  
 18     use the lowest 8 rounds  
 19     use the lowest 9 rounds  
Step 2:   Do the First Calculations (see Example 1 above) for all rounds of
Step 3:   Do the Last Calculations (see Example 1 above) for the number
of rounds indicated in the table (see Step 1) to be used in the handicap.
If the number of rounds of history is more than 4,  this step will result in
your handicap index.    If you have less than 5 rounds of history 
proceed to Step 4.
Step 4:   Using Table 1 below find the number of rounds you have with
5Gs on the left column.    Then find the number to the right of that number
on that same line.    
Your Handicap Index is found by multiplying the number found in Step 3
with the number found on the table below.
This number is your Handicap Index unless you have less than 5 rounds
with 5Gs over the last rolling 12 month period. 
If less than 5 rounds applies to your case go to the shaded red area at the
bottom of this section.
Table 1    
Number of  Multiply Result from    
5Gs rounds Step 3 by this number.    
 1   0.80      
 2   0.85      
 3   0.90      
 4   0.95      
Special Case Handicap Index Calculation an additional step:   
If you have played at least 5 rounds with 5Gs over the last rolling 12 month
period your handicap index is what you calculated (using instructions
up to this point).   
If you have less than 5 rounds with 5Gs over the last rolling 12 month
period an additional multiplier might be used to adjust the handicap index you 
calculated (using the instructions up to this point).
Additional Multiplier Determination method:
Using Table 2 below find the appropriate ADDITIONAL MULTIPLIER
considering the total number of rounds you have with 5Gs AND the total number 
of rounds with 5Gs over the last rolling 12 month period.    Then multiply
the handicap index value you calculated earlier by this number.
The result is your FINALIZED handicap index.
Total   Number of 5Gs rounds    
Number of  in last rolling      
5Gs rounds 12 month period   ADDITIONAL MULTIPLIER
 1   0 or 1     No Multiplier
 2   0 or 1     0.941
    2     No Multiplier
 3   0 or 1     0.889
    2     0.944
    3     No Multiplier
 4   0 or 1     0.842
    2     0.895
    3     0.947
    4     No Multiplier
 5   0 or 1     0.800
(or more) 2     0.850
    3     0.900
    4     0.950
WHEW!!!!    If you have gotten this far you are to be congratulated!
Your mind has probably turned to PUTTY or you are about to fall asleep
with your head on the keyboard.   Sorry about that, but as you can see the
Handicap question is not trivial.    ANYWAY, the league hopes that you enjoy golf and
that you let your handicap take care of itself.
If you still have handicap questions,  please direct them to me via email
at address:  [email protected]
Jerry Chruma, 5Gs Webmaster and Handicap Officer