Sports & Gaming · Statistics · Descriptive Statistics
Golf Course Handicap Calculator
Calculates a golfer's Course Handicap from their World Handicap System Handicap Index, Course Rating, Slope Rating, and Par.
Calculator
Formula
HI = Handicap Index (from your home club); SR = Slope Rating of the tees played (55–155, standard is 113); CR = Course Rating of the tees played; Par = Par of the course. The result is rounded to the nearest whole number.
Source: World Handicap System (WHS) Rules of Handicapping, USGA/R&A, 2020. Section 6.1.
How it works
The World Handicap System (introduced globally in 2020) uses three pieces of course-specific data alongside your personal Handicap Index to compute your Course Handicap. The Slope Rating (ranging from 55 to 155, with 113 representing a course of standard difficulty) scales your index to account for how much harder or easier the course plays for bogey golfers relative to scratch golfers. The Course Rating is the expected score of a scratch golfer on that course, and Par is the target score for the course. The formula is: Course Handicap = HI × (SR / 113) + (CR − Par), rounded to the nearest whole number.
The Slope Rating adjustment is the central innovation of the modern handicap system. Before the WHS, systems simply applied an index to a flat number, meaning a course with a Slope of 140 gave the same strokes as one with a Slope of 100. The current formula corrects this by proportionally scaling your handicap upward on tougher-than-average courses and downward on easier ones. The (CR − Par) term further adjusts for courses whose difficulty differs from their par, ensuring fair competition.
Course Handicaps are used in stroke play (you subtract your course handicap from your gross score to get your net score), match play (each player calculates their course handicap and the difference determines who receives strokes and on which holes), and Stableford formats (your course handicap determines your allocation of shots per hole). The calculation must be performed separately for every combination of course and tee set you play.
Worked example
Given: A golfer has a Handicap Index of 18.4. They are playing the Blue tees at their local course, which has a Slope Rating of 128, a Course Rating of 72.3, and a Par of 71.
Step 1 — Slope adjustment: 18.4 × (128 / 113) = 18.4 × 1.1327 = 20.84
Step 2 — Add Course Rating vs Par: CR − Par = 72.3 − 71 = +1.3
Step 3 — Sum: 20.84 + 1.3 = 22.14
Step 4 — Round: Round 22.14 to the nearest whole number = 22
Result: The golfer's Course Handicap is 22 strokes. In stroke play they subtract 22 from their gross score. In match play they compare their 22 to their opponent's course handicap; if the opponent has a course handicap of 10, the golfer receives 22 − 10 = 12 strokes, allocated to the 12 hardest stroke-index holes.
Limitations & notes
This calculator implements the standard WHS Course Handicap formula and assumes a maximum Handicap Index of 54.0 (the WHS cap). If your home club uses a regional variation — such as the EGA system in Europe pre-2020 or a local competition handicap adjustment factor — the result may differ slightly. Some competitions also apply a Playing Handicap allowance (e.g. 90% for stroke play, 85% for four-ball) on top of the Course Handicap; this calculator outputs the full 100% Course Handicap only. Slope Ratings below 55 or above 155 are not valid under WHS rules. Always verify course-specific data (Course Rating, Slope Rating) from your national golf federation's official course database, as unofficial or outdated values will produce an incorrect Course Handicap.
Frequently asked questions
What is the difference between a Handicap Index and a Course Handicap?
Your Handicap Index is a portable, course-neutral measure of your demonstrated ability, calculated from your best recent rounds using the WHS formula. A Course Handicap is course-specific: it converts your Index into the number of strokes you actually receive on a particular set of tees on a particular day, accounting for that course's Slope Rating, Course Rating, and Par. You will have one Handicap Index but a different Course Handicap on every course you play.
What is a Slope Rating and why does it matter?
The Slope Rating measures how much more difficult a course is for a bogey golfer (around 20 handicap) compared to a scratch golfer. It ranges from 55 (easiest) to 155 (hardest), with 113 defined as the standard. A Slope of 113 means the calculator leaves your index unchanged. A Slope above 113 increases your Course Handicap (you receive more strokes) because the course penalises higher-handicap players more. A Slope below 113 reduces your Course Handicap.
How is the Course Rating different from Par?
Par is the theoretical score a professional-level golfer should achieve on a hole or course. Course Rating is the expected score of a scratch golfer (0 handicap) under normal playing conditions on that specific set of tees — it is evaluated by a trained rating team and can differ from Par. For example, a par-72 course might have a Course Rating of 73.5 if it plays particularly tough for scratch golfers, or 70.8 if it is relatively easy. The (CR − Par) term in the formula corrects for this difference.
Do I need to recalculate my Course Handicap every time I play a different course or tee set?
Yes. Every combination of course and tee set has unique Slope Rating and Course Rating values. Playing the Red tees instead of the White tees at the same course will give a different Slope Rating and Course Rating, and therefore a different Course Handicap. Always look up the official ratings for the specific tees you are playing that day and recalculate before your round.
What is a Playing Handicap and how does it differ from Course Handicap?
A Playing Handicap applies a competition-specific allowance percentage to the Course Handicap. For example, in individual stroke play the WHS recommends a 95% allowance, so a Course Handicap of 20 becomes a Playing Handicap of 19 (20 × 0.95, rounded). In four-ball better-ball the allowance is 85%. This calculator outputs the full 100% Course Handicap; to find your Playing Handicap, multiply the result by the competition allowance and round to the nearest whole number.
What is the maximum Course Handicap a golfer can have?
The WHS caps the Handicap Index at 54.0 for all golfers (male and female). When this is converted to a Course Handicap on a very difficult course (e.g. Slope 155), the resulting Course Handicap can be considerably higher than 54 — potentially up to around 74. There is no separate cap on the Course Handicap itself; the cap operates at the Handicap Index level before the calculation is performed.
Last updated: 2025-01-30 · Formula verified against primary sources.