A handicap lets golfers of different abilities compete fairly, and since 2020 most of the world has used one system to calculate it: the World Handicap System (WHS), administered by the USGA and The R&A. This calculator applies the WHS formulas to your recent scores to estimate your Handicap Index, then converts it into the strokes you get on a particular set of tees.
How to use the golf handicap calculator
- List your rounds, oldest first, one per line: adjusted gross score, course rating and slope rating — for example
92, 71.8, 131. Add the playing conditions calculation (PCC) as a fourth number if your association published one for that day. - Optionally enter your Low Handicap Index from the past year to apply the soft and hard caps (only used once you have 20 scores).
- Under Course Handicap, enter the course rating, slope and par of the tees you will play next, and choose the format.
- Read your estimated Handicap Index, Course Handicap and Playing Handicap. The table marks which rounds were used.
WHS handicap formulas
Differentials and the Index are rounded to one decimal place; Course and Playing Handicaps are rounded to whole strokes. A slope rating of 113 is standard difficulty, so on 113-slope tees the slope factor leaves the Index unchanged and only the course rating − par term adjusts it. The Index cannot exceed 54.0.
Fewer than 20 scores
| Scores on record | Differentials used | Adjustment |
|---|---|---|
| 3 | Lowest 1 | −2.0 |
| 4 | Lowest 1 | −1.0 |
| 5 | Lowest 1 | 0 |
| 6 | Lowest 2 | −1.0 |
| 7–8 | Lowest 2 | 0 |
| 9–11 | Lowest 3 | 0 |
| 12–14 | Lowest 4 | 0 |
| 15–16 | Lowest 5 | 0 |
| 17–18 | Lowest 6 | 0 |
| 19 | Lowest 7 | 0 |
| 20 | Lowest 8 | 0 |
Worked example
Ten rounds with differentials 17.4, 15.9, 18.7, 14.1, 16.6, 15.0, 18.2, 14.1, 16.6 and 12.3. The most recent, an 84 on tees rated 70.4 / 125, works out to (113 ÷ 125) × (84 − 70.4) = 12.3.
With 10 scores, the lowest 3 count: 14.1, 14.1 and 12.3, averaging 13.5. Handicap Index = 13.5.
On tees rated 72.3 with slope 128 and par 72: 13.5 × (128 ÷ 113) + (72.3 − 72) = 15.59, so the Course Handicap is 16. For individual stroke play at 95%, the Playing Handicap is 16 × 0.95 = 15.2 → 15.
Rules that keep the Index honest
Soft and hard caps
Your Index is compared with your Low Handicap Index — the lowest it has been in the past 365 days. If it would rise more than 3.0 strokes above that, only half of the excess counts (the soft cap), and it can never rise more than 5.0 strokes above it (the hard cap). This stops a temporary slump from inflating the Index.
Exceptional scores
A round with a differential 7.0 to 9.9 strokes better than your Index reduces your recent differentials by 1.0; 10.0 or more reduces them by 2.0. Associations apply this automatically, and this calculator does not.
Handicap allowances
| Format | Allowance |
|---|---|
| Individual stroke play | 95% |
| Individual match play | 100% |
| Four-ball stroke play | 85% |
| Four-ball match play | 90% |
These are the WHS recommended allowances; the tournament committee has the final say.
Plus handicaps
Very strong players can have an Index below zero, written with a plus sign, such as +1.2. They give strokes back to the course rather than receive them. Enter a plus Low Handicap Index as a negative number.
Keep a running list of scores and the mean calculator shows your scoring average. For another sport scored frame by frame, try the bowling score calculator.
Estimate only. Your official Handicap Index comes from your golf association under the Rules of Handicapping.
Frequently asked questions
How is a golf Handicap Index calculated?
For each round, a score differential is (113 ÷ slope rating) × (adjusted gross score − course rating − playing conditions adjustment). Your Handicap Index is the average of the lowest 8 differentials from your most recent 20 rounds, rounded to one decimal place.
How many rounds do I need for a handicap?
Three 18-hole rounds (54 holes) are enough to start. With fewer than 20 rounds a smaller number of the best differentials is used, with an adjustment of −2.0 or −1.0 when you have only 3, 4 or 6 scores.
What is the difference between a Handicap Index and a Course Handicap?
The Handicap Index measures your ability on a course of standard difficulty. The Course Handicap converts it to strokes for specific tees: Index × (slope ÷ 113) + (course rating − par). A 13.5 Index on tees rated 72.3 / 128 with par 72 gives a Course Handicap of 16.
What is an adjusted gross score?
It is your score after capping bad holes. Under the World Handicap System the most you can post on a hole is net double bogey: par + 2 + any handicap strokes you receive on that hole. Use the adjusted score, not the raw one, in this calculator.
Is this an official handicap?
No. Official Handicap Indexes are issued by authorized golf associations, which also apply exceptional-score reductions and committee adjustments. This calculator follows the published rules to give a close estimate.