Miles Bennett
Golf handicaps are a measure of a golfer's potential playing ability, allowing players of different skill levels to compete on more equal grounds. The handicap system, introduced in 1911, assigns a numerical value to each golfer, with a higher number indicating a less skilled golfer. While the calculation of golf handicaps has evolved over time, the current formula involves multiplying the handicap index (an average of golf round scores) by the slope rating (a measure of course difficulty) and dividing by 113. This value is then adjusted based on the course rating and playing conditions to determine the handicap differential. Golfers can utilise online calculators and apps to determine their handicap index and course handicap, promoting accessibility and inclusivity in the sport.
| Characteristics | Values |
|---|---|
| Purpose of a golf handicap | To make the game more competitive between players of different skill levels |
| Handicap calculation | Handicap Index x (Slope Rating/113) + (Course Rating - Par) |
| Handicap Index calculation | Sum of differentials/number of differentials x 0.96 |
| Handicap Differential calculation | (AGS - Course Rating) x 113 / Slope Rating |
| AGS calculation | Total number of strokes taken during a round, adjusted for maximum per-hole scores |
| Minimum scores for Handicap Index | 3 x 18-hole scores or 5 x 18-hole scores or 10 x 9-hole scores |
| Maximum scores for Handicap Index | 20 scores |
| Course Handicap calculation | Handicap Index x Slope Rating/113 |
| Playing Conditions Calculation | A number between -1 and 3, depending on the difficulty of the course |
| Scratch golfer | Golfer with a handicap of 0 |
| Bogey golfer | Golfer with a handicap of approximately 18 |
| Course rating | Measure of how many strokes a scratch golfer should take on any given course |
| Slope rating | Measure of the relative difficulty of a course for a bogey golfer compared to a scratch golfer |
| Bogey rating | Measure of playing difficulty for a bogey golfer |
| Handicap Index | A measure of golfing ability |
| USGA handicaps range | 0-36 for men and 0-40 for women |
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What You'll Learn
Handicap Index calculation
A golf handicap is a measure of a golfer's potential playing ability. It is intended to make the game more competitive between players of different skill levels. The higher the handicap, the poorer the golfer's ability relative to a player with a lower handicap.
To calculate your Handicap Index, you will need a minimum of three 18-hole scores or ten 9-hole scores, and a maximum of 20 scores. You will use these scores to calculate your Adjusted Gross Score (AGS). Your AGS is your average score for the total number of games used.
Once you have your AGS, you can calculate your handicap differential. The equation for this is: (AGS - Course rating) x 113 / Slope Rating. The course rating is the number of strokes a scratch golfer (a player with a handicap of zero) should take on any given course. The Slope Rating is the difficulty of the course for an average golfer.
Finally, to calculate your Handicap Index, you will need to sum your differentials and divide these by the number of differentials used, then multiply the result by 0.96. This figure of 0.96 represents a "bonus for excellence".
Your Handicap Index will allow you to determine your Course Handicap for the specific golf course on which you're playing.
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Adjusted Gross Score
An "adjusted gross score" is a player's gross score adjusted under USGA Handicap System procedures for unfinished holes, conceded strokes, holes not played, or holes not played under the Rules of Golf. The main method of arriving at the Adjusted Gross Score is to adjust each hole score downward to a net double bogey, if necessary. That means, for handicapping purposes, a player can have up to Par + 2 (strokes) + any handicap strokes received on that hole. For example, if the par is 5 and a player receives 1 stroke on the hole, for handicapping purposes, the hole score is limited to 5 + 2 (strokes) + 1 (handicap strokes received on the hole), or 8. Each hole where a player shoots higher than a net double bogey must be adjusted downward to a net double bogey.
The number of strokes a golfer receives is determined using their full, unrestricted Course Handicap. The Course Handicap is rounded to the nearest whole number. There are two exceptions: when a player doesn't yet have an Index, and when a player's Course Handicap is more than 54. If a golfer does not yet have an Index, each hole is adjusted to par + 5 strokes.
Equitable Stroke Control requires that a player posts a maximum of double bogey on any given hole if their Course Handicap is 9 or less for 18 holes. On holes 11, 12 and 13, if a player's gross scores were more than a double bogey, then for handicapping purposes, their adjusted gross score is adjusted downward to 5, 7 and 6 respectively, or double bogeys. For each course/tee combination, a player will have a calculated Course Handicap.
The Adjusted Gross Score is calculated after each round in the WHS system. Rules of Handicapping state that “A score for handicap purposes should not be overly influenced by one or two bad hole scores, which are not reflective of a player’s demonstrated ability.” So, for handicap purposes, the number of strokes scored on each hole is adjusted as follows: the maximum hole score is limited to net double bogey on each played hole; for adjustment purposes, the maximum Course Handicap is limited to 54; if the number of strokes on a hole exceeds the net double bogey, the score is adjusted to net double bogey; if a player starts a hole but does not hole out, the score is set as net double bogey.
Net Double Bogey is calculated using the following formula: When a player submits the score before his first (initial) Handicap Index is obtained, there is no net double bogey value. Then the limit of par+5 is used for the above adjustment of score on each played hole. Therefore the Course Handicap for an 18-hole round is 54 and that for a 9-hole round is 27. The value of Course Handicap is needed for Adjusted Gross Score calculation.
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Course Handicap
A course handicap is a representation of a golfer's ability level on a particular course. It is a conversion of a golfer's Handicap Index, which is a portable number representing their demonstrated ability, into a number that accounts for the difficulty of the course and tees played. This number is used to adjust hole scores for net double bogey.
A course handicap is calculated using the formula: Handicap Index x (Slope Rating/113) + (Course Rating - Par). The Handicap Index is an average of golf round scores and is calculated by summing differentials and dividing them by the number of differentials used, then multiplying the result by 0.96. A minimum of three 18-hole scores or five 9-hole scores are required to calculate the Handicap Index, though up to 20 scores can be used. The Slope Rating represents the difficulty of the golf course for an average golfer and can be obtained from the course. The Course Rating is a value assigned by the USGA to each hole on the course, indicating the number of strokes that should be needed to complete it, and can also be obtained from the course.
The course handicap changes based on course difficulty (rating/slope). A course with a higher slope rating will be more difficult for a bogey golfer, while a lower slope rating will be less difficult. The course rating also reflects the expected score for a scratch golfer (handicap of zero) and a bogey golfer (handicap of approximately 18).
It's important to note that a golfer's handicap is not static and is regularly adjusted to reflect their current skill level. As a golfer plays more rounds and records scores, their average and handicap can change. Additionally, the handicap formula must be applied each time a golfer plays a new course if they did not have a previous rating.
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Slope Rating
The Slope Rating of a golf course is a measure of its difficulty. It is a companion to the handicap system, accounting for course difficulty for golfers of differing abilities. The higher the Slope Rating, the more difficult the course. The Slope Rating can range from 55 to 155, but the average is 113. Each set of tee boxes will have their own Slope Rating, as the difficulty will vary depending on whether you're playing from the front or back tees.
The Slope Rating is calculated by comparing the course rating to bogey golfers' scores. The course rating is the expected score for a scratch golfer (0 handicap) over 18 holes. The Bogey Rating is the expected score for a bogey golfer (handicap index of 18). The Course and Bogey Ratings take into account the course's effective playing length, along with 10 obstacle factors for each hole, such as topography, lateral obstacles and bunkers.
To determine a player's handicap on a particular course, the following formula is used: Handicap Index x (Slope Rating/113) + (Course Rating - Par). The Handicap Index is an average of golf round scores and has its own calculation. This formula requires you to sum your differentials and divide these by the number of differentials used, then multiply the result by 0.96.
The Slope Rating is useful for golfers as it helps them to see how they stack up when playing different courses, and can also help them choose the correct tee boxes.
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Handicap Differential
A handicap differential is a measure of a golfer's performance on a particular course on a particular day. It takes into account the difficulty of the course, and how this might affect a player's score. The handicap differential is calculated using the following formula:
> Handicap Differential = (Adjusted Gross Score - Course Rating) x (113/ Slope Rating)
The Adjusted Gross Score is a golfer's score for the day, adjusted for playing conditions. The Course Rating is the evaluation of the playing difficulty of a course for a scratch golfer (a golfer with a handicap of zero). The Slope Rating is the difficulty of the course for an average golfer, calculated by comparing the course rating to bogey golfers' scores (a bogey golfer is a golfer with a handicap of around 18).
The formula can also be expressed as:
> Handicap Differential = Score Differential x 113 / Slope Rating
Where the Score Differential is the difference between the Adjusted Gross Score and the Course Rating.
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Frequently asked questions
A golf handicap is a way to make the game of golf more competitive between players of different skill levels. It reflects your skill level based on the course’s par round total compared to your score.
You need a minimum of three 18-hole scores or five 9-hole scores. You can use up to 20 scores to calculate your handicap.
The formula is: Handicap Index x (Slope Rating/113) + (Course Rating - Par). The handicap index is an average of golf round scores and has its own calculation.
The formula for the handicap index is: (Sum of Differentials / Number of Differentials) x 0.96. The sum of differentials is calculated by taking the adjusted gross score minus the course rating, multiplied by 113, and divided by the slope rating.
The course rating is the measure of how many strokes a scratch golfer (a player with a handicap of zero) should take on any given course. The slope rating is the difficulty of the course for an average golfer and is calculated by comparing the course rating to the scores of bogey golfers (players with a handicap of around 18).
