1. Calculate your Handicap Index
Enter your most recent rounds below (up to 20). You need scores from at least 54 holes to calculate an initial Handicap Index — for example, three 18-hole rounds, or six 9-hole rounds.
Enter your Adjusted Gross Score for each round. What does that mean?
Note: 9-hole rounds are calculated using a simplified method and may differ slightly from your official club-recorded Index.
2. Convert to a Course Handicap and Playing Handicap
Enter a Handicap Index (your own, or the one calculated above) along with the ratings for the course you're playing to get your Course Handicap, then choose a format to see your Playing Handicap. This section works on its own — you don't need to complete Section 1 first.
Recommended allowances from Appendix C of the Rules of Handicapping (the 95% individual figure is for a medium-sized field of 30 to 100 players). A competition's Committee can set a different allowance in its Terms of the Competition. Foursomes, Greensomes, Pinehurst/Chapman, scrambles and Four-Ball match play aren't listed, because their allowances apply to a team's combined handicaps or the difference between players, not to one player's Course Handicap.
How this is calculated
This calculator implements the R&A's Rules of Handicapping directly from their current 2024 revision, not a summary of the original 2020 version that most publicly available explanations still describe.
For each round, a Score Differential is worked out from your score, the course's Course Rating and Slope Rating, and any Playing Conditions Calculation (PCC) adjustment for that day. Your Handicap Index is then built from the lowest of those differentials, not an average of all of them: with fewer than 20 scores on record, a specific lookup table sets how many of your lowest differentials to use and what adjustment to apply; with 20 or more, it's the average of your lowest 8 from the most recent 20. That lookup table changed in the 2024 revision, removing several of the extra adjustments the original 2020 table applied at certain score counts, which is exactly the kind of detail a lot of older guides haven't caught up with.
Your Course Handicap then converts that Handicap Index into actual strokes for a specific course, using its Slope Rating, Course Rating, and par. The full formulas, with the relevant rule numbers, are commented directly in this page's source code, so the working is auditable rather than a black box. Finally, a Playing Handicap applies the handicap allowance for your format of play to the unrounded Course Handicap, per Rule 6.2a, and rounds the result to the nearest whole number.
Two parts of the Rules of Handicapping are deliberately not applied here: Exceptional Score Reduction (Rule 5.9) and the soft and hard caps (Rule 5.7). Both work against your handicap history, comparing a new score with the Handicap Index you held when you played it or with your Low Handicap Index from the previous 365 days, and this calculator never stores any history, locally or anywhere else, by design. That's a permanent consequence of keeping your scores private, not a feature waiting to be added. The Handicap Index shown is the Rule 5.2 calculation from the scores you enter; where your record triggers either safeguard, your official Handicap Index will reflect it.
Glossary of terms
- Course Rating
- A number representing the expected score a scratch golfer would shoot on a given set of tees, under normal conditions. See also: What if I don't know my course's Course Rating or Slope Rating?.
- Slope Rating
- A number, from 55 to 155, representing how much harder a course plays for a bogey golfer relative to a scratch golfer. A higher Slope Rating means a bigger gap between the two, and a bigger swing in strokes received. See also: What if I don't know my course's Course Rating or Slope Rating?.
- Adjusted Gross Score
- Your total score for a round after any hole score above your maximum hole score has been reduced to that maximum: net double bogey (par + 2, plus any handicap strokes you receive on that hole) once you have a Handicap Index, or par + 5 for your first scores (Rule 3.1). It is the score to enter in this calculator. See also: What is an Adjusted Gross Score, and what score should I enter?.
- Score Differential
- A single number that converts one round's score into a course-independent measure of how well you played, using that round's Course Rating, Slope Rating, and any PCC adjustment. Your Handicap Index is built from your best recent Score Differentials. See also: Why does my Handicap Index only use some of my rounds, not all of them?; Do all my rounds have to be from the same course?; What is an Adjusted Gross Score, and what score should I enter?.
- PCC (Playing Conditions Calculation)
- A same-day adjustment, from -1.0 to +3.0, applied when a course played unusually easy or hard compared to its ratings, so weather or course setup on a given day doesn't distort everyone's Handicap Index. See also: What does PCC mean?.
- Handicap Index
- A single, portable number representing your demonstrated golfing ability, valid at any course you play. See also: How many rounds (scores) do I need to get a golf handicap?; Is the result here my official Handicap Index?; What does a plus handicap mean?; Can I get a golf handicap without joining a club?.
- Course Handicap
- Your Handicap Index converted into the actual number of strokes you receive at a specific course, from a specific set of tees. See also: What's the difference between Handicap Index and Course Handicap?; What does a plus handicap mean?; What's the difference between a Course Handicap and a Playing Handicap?.
- Playing Handicap
- Your Course Handicap with a percentage allowance applied for a specific format of play (Rule 6.2), such as 95% for individual stroke play. This calculator applies the R&A's recommended allowances for formats where the allowance depends only on your own Course Handicap; a competition's Committee can set a different allowance in its Terms of the Competition. See also: Why do Playing Handicap allowances differ by format?; What's a Playing Handicap, and does this calculator work it out?; What does a plus handicap mean?; What's the difference between a Course Handicap and a Playing Handicap?.
Frequently asked questions
How many rounds (scores) do I need to get a golf handicap?
You need acceptable scores from at least 54 holes to get an initial golf handicap (a Handicap Index), under Rule 4.5 of the Rules of Handicapping — for example, three 18-hole rounds, or six 9-hole rounds. With fewer than 20 scores on record, a lookup table (Rule 5.2a) sets how many of your lowest Score Differentials are used and whether an adjustment is applied; once you have 20 or more scores, your Handicap Index is the average of the lowest 8 Score Differentials from your most recent 20 rounds.
Why does my Handicap Index only use some of my rounds, not all of them?
The Rules of Handicapping deliberately use only your best recent Score Differentials, not an average of everything you've played, because a Handicap Index is meant to represent your demonstrated potential ability rather than your average round. Averaging in your worse rounds as well would understate what you're actually capable of shooting.
What does PCC mean?
PCC stands for Playing Conditions Calculation. It's a small adjustment, from -1.0 to +3.0, applied to a day's scores when conditions on a course made scoring unusually easy or hard compared to what its Course Rating and Slope Rating would predict, so that a genuinely tough day doesn't unfairly inflate everyone's Handicap Index.
What's the difference between Handicap Index and Course Handicap?
Your Handicap Index is a single portable number representing your demonstrated ability, valid at any course. Your Course Handicap is that Handicap Index converted, using a specific course's Course Rating, Slope Rating, and par, into the actual number of strokes you receive when playing that particular course from a particular set of tees.
What's a Playing Handicap, and does this calculator work it out?
A Playing Handicap is your Course Handicap with a percentage allowance applied for the format of play, for example 95% for individual stroke play or 85% for Four-Ball stroke play. Yes, this calculator works it out: after calculating a Course Handicap, choose a format and it applies the R&A's recommended allowance from Appendix C of the Rules of Handicapping to your unrounded Course Handicap, as Rule 6.2a requires. A competition's Committee can set a different allowance, so check the Terms of the Competition. Formats whose allowance depends on other players' handicaps, such as Foursomes, Greensomes, scrambles and Four-Ball match play, aren't included.
How is a 9-hole handicap calculated here, and can I use 9-hole rounds?
Yes. 9-hole rounds count towards the 54-hole minimum, so six 9-hole rounds are enough. For each one, this calculator works out a 9-hole Score Differential using the official Rule 5.1b formula, but uses that figure directly rather than combining it with an "expected score" for the unplayed 9 holes as the full official method does. That combination depends on a player's existing Handicap Index, which is circular for a calculator building one from scratch, so 9-hole results here are a close approximation rather than an exact match to your official club-recorded Index.
Is this calculator specific to the UK, or does it work for any golfer?
The World Handicap System, including the Rules of Handicapping this calculator implements, is used internationally, so the underlying maths is the same wherever you play. This calculator is built specifically from the R&A's version of the rules, the governing body for golf outside the United States and Mexico, which makes it particularly suited to UK golfers using R&A-issued Course Ratings and Slope Ratings.
Is my data stored anywhere when I use this calculator?
No. Every calculation runs in your browser using JavaScript; the scores, ratings, and results you enter are never sent to or stored on a server. Closing or reloading the page clears everything you entered.
Does this calculator apply Exceptional Score Reduction or the soft and hard caps?
No, and it never will. Exceptional Score Reduction (Rule 5.9) and the soft and hard caps (Rule 5.7) both depend on your handicap history, namely the Handicap Index you held when a score was made and your Low Handicap Index over the previous 365 days, and this calculator deliberately never stores any history, locally or anywhere else. That's a permanent consequence of its privacy-first design rather than a missing feature. The result shown is the Rule 5.2 calculation from the scores you enter; if either safeguard applies to your record, your official Handicap Index will already reflect it.
Why do Playing Handicap allowances differ by format?
Because the same handicap doesn't give the same advantage in every format. The R&A's recommended allowances in Appendix C of the Rules of Handicapping are set so that each player or side has a fair chance of winning. In individual stroke play, 95% is recommended for a medium-sized field of 30 to 100 players, with the R&A's guidance suggesting a higher or lower figure for unusually small or large fields, or fields weighted towards low or high handicaps. In individual match play the full 100% is used, and the player with the lower Playing Handicap plays off zero while the other receives the difference. Formats where a side has more than one chance to score on each hole, such as Four-Ball stroke play at 85% or Best 1 of 4 at 75%, get a lower allowance, because several balls in play make a good net score more likely. A competition's Committee can set a different allowance.
What if I don't know my course's Course Rating or Slope Rating?
Don't guess, or borrow the numbers from another course or set of tees, because both your Course Handicap and each round's Score Differential depend directly on them. Every rated set of tees has its own Course Rating and Slope Rating, and they usually differ between men's and women's tees. They are normally printed on the scorecard, shown on the club's website or in the clubhouse, or available from the club's handicap secretary or professional. Enter the par for the same set of tees, which is also on the scorecard. If you can't find the figures, ask the club, since a rough estimate can noticeably change your result.
Is the result here my official Handicap Index?
No. Your official Handicap Index is issued and maintained through your club or national golf association's handicap system, which works from your full scoring record. This calculator applies the Rule 5.2 calculation to the scores you enter, so treat the result as a close estimate rather than an official figure. It can differ from your official Index where your record includes things this calculator doesn't apply, such as Exceptional Score Reduction and the soft and hard caps, or where 9-hole rounds are involved. For competitions and entries, use the Handicap Index your club or national association gives you.
Do all my rounds have to be from the same course?
No. Each round's Score Differential is calculated using that round's own Course Rating, Slope Rating and any PCC adjustment, which is what makes scores from different courses and different sets of tees comparable. Enter the ratings for the course and tees you played in each round, and the calculator does the rest.
What does a plus handicap mean?
A plus handicap, written with a plus sign such as +2.4, is a Handicap Index better than scratch (0.0). Under Rule 5.2c of the Rules of Handicapping, it is what you have when the Handicap Index calculation produces a negative figure. A plus-handicap player gives strokes back rather than receiving them: a plus Course Handicap or Playing Handicap is added to the player's gross score to reach the net score, so a Playing Handicap of +3 turns a gross 72 into a net 75. That is why a plus handicap is treated as a negative number in the maths, even though the R&A encourages players to write it with a plus sign for consistency. In this calculator, enter a plus Handicap Index as a negative number (for example -2.4 for +2.4), and the results are shown with a plus sign.
What's the difference between a Course Handicap and a Playing Handicap?
A Course Handicap converts your Handicap Index for a specific course and set of tees, using its Course Rating, Slope Rating and par (Rule 6.1). A Playing Handicap goes one step further: it applies the handicap allowance for the format of play to your unrounded Course Handicap (Rule 6.2), and it is the number of strokes you actually use in that round or competition. For example, a Course Handicap of 20 gives a Playing Handicap of 19 in individual stroke play at a 95% allowance, but 17 in Four-Ball stroke play at 85%. So your Course Handicap stays the same for a given course and tees, while your Playing Handicap changes with the format.
What is an Adjusted Gross Score, and what score should I enter?
An Adjusted Gross Score is your total score for the round after any hole where you scored more than your maximum hole score has been reduced to that maximum. Under Rule 3.1 of the Rules of Handicapping, once you have a Handicap Index the maximum for a hole is net double bogey: par plus 2, plus any handicap strokes you receive on that hole (or minus any you give back, if you have a plus handicap). For the first scores you submit to obtain an initial Handicap Index, the maximum is par plus 5. Enter your Adjusted Gross Score in each round's Score box. This calculator doesn't adjust hole scores for you, so if you had any very high holes, reduce them to your maximum before adding up the total.
Can I get a golf handicap without joining a club?
Yes, if you live in England. England Golf's iGolf scheme is for golfers who aren't members of a golf club. It issues a Handicap Index recognised under the World Handicap System, and iGolf describes itself as the only way non-club golfers in England can obtain a recognised Handicap Index. You subscribe to iGolf (£47 a year at the time of writing, according to iGolf) and submit scores for 54 holes, in any combination of 9-hole and 18-hole rounds. There are eligibility rules, including for people who have recently left a club, so check the current terms with iGolf. Outside England, check with your own national golf association. This calculator is a free way to estimate your Handicap Index from your scores without a subscription, but it is not an official Handicap Index. If you need one, for example to enter competitions that require an official Handicap Index, iGolf is the route to an official one. Source: England Golf's iGolf, englandigolf.co.uk.