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Golf handicap calculator: estimate your Handicap Index

The World Handicap System, run by the USGA and The R&A, publishes its formulas in the Rules of Handicapping. This calculator follows them in order: each 18-hole round becomes a score differential, and your lowest differentials become a Handicap Index — using the published table when you have fewer than 20 scores.

The result is an estimate. Only an authorized golf association issues an official Handicap Index, and some of its rules depend on your scoring history, which this page does not have; the explanation below says which.

By Reign Creative LLCPublished More in the Golf hub

Calculate your Handicap Index

Work out each round’s score differential, collect them in the list, and the index updates as you go.

1. Score differential for one round

Your 18-hole score after net double bogey and the other adjustments.

113 is a course of standard difficulty.

−1 to +3, as published for the day. Usually 0.

Score differential18.118.098 before rounding

2. Handicap Index from your differentials

One per line, or separated by commas. Only the most recent 20 count.

Estimated Handicap Index16.9

Differentials counted
5
Lowest differential used
16.9
Table adjustment
none

Next: turn your index into a course handicap for a set of tees.

Step 1: the score differential

Rule 5.1a

score differential = (113 ÷ Slope Rating) × (adjusted gross score − Course Rating − PCC)

The adjusted gross score is your 18-hole score after the handicap adjustments, such as capping a hole at net double bogey. The Course Rating is what a scratch player is expected to shoot from those tees; the Slope Rating reflects how much harder the course plays for a bogey golfer than for a scratch golfer, with 113 as the standard. PCC is the playing conditions calculation, an adjustment from −1.0 to +3.0 for days when course or weather conditions significantly changed scoring. The result is rounded to the nearest tenth, with .5 rounded up.

Example: a score of 92 from tees rated 71.5 / 128, with no PCC adjustment, gives (113 ÷ 128) × (92 − 71.5) = 18.098, which rounds to 18.1.

Step 2: the Handicap Index

With 20 differentials, the Handicap Index is the average of the lowest eight of the most recent twenty (Rule 5.2b). With fewer, Rule 5.2a’s table decides how many of the lowest to use and whether to adjust the result:

Rules of Handicapping 5.2a and 5.2b
Differentials in the recordUsed in the calculationAdjustment
3Lowest 1-2.0
4Lowest 1-1.0
5Lowest 10
6Average of lowest 2-1.0
7 to 8Average of lowest 20
9 to 11Average of lowest 30
12 to 14Average of lowest 40
15 to 16Average of lowest 50
17 to 18Average of lowest 60
19Average of lowest 70
20Average of lowest 80

The result is rounded to the nearest tenth, and no Handicap Index can exceed 54.0. Example: with five differentials — 18.1, 20.4, 16.9, 22.0, 19.3 — the table says to use the lowest one with no adjustment, so the Handicap Index is 16.9. To use it on a particular course, the course handicap calculator takes the next step.

What this calculator cannot do

An official Handicap Index is calculated by your handicap provider from your full scoring record, and some of the rules depend on information this page does not have:

  • The soft cap and hard cap, which limit how fast an index can rise compared with your Low Handicap Index — the lowest of the previous 365 days.
  • Exceptional-score reductions, applied when a differential is at least 7.0 strokes better than your index at the time.
  • Adjustments made by a Handicap Committee.
  • 9-hole scores, which are converted under rules of their own.

Treat the result as an estimate. For what the number means in practice, read golf handicaps for beginners.

Golf Career Simulator Pro Tour is our golf career game: you make the course-management decision on every shot and chase rankings across tour seasons, rather than timing a swing.

Reign Creative LLC makes Golf Career Simulator Pro Tour, so we have a commercial interest in it. It is not affiliated with, or endorsed by, any league, team, players’ association or athlete.

Good to know

Frequently asked questions

What is an adjusted gross score?
Your gross score, penalty strokes included, after the adjustments the Rules of Handicapping make for handicap purposes — for example, capping any hole at net double bogey, the maximum hole score for handicap purposes. Use the adjusted score, not your raw total, when calculating a differential.
Why does the formula use 113?
A course of standard relative difficulty has a Slope Rating of 113. Dividing 113 by your course’s Slope Rating scales the score to that standard, so differentials from easier and harder courses can be compared.
How many scores do I need for a Handicap Index?
At least three score differentials, which is where the USGA’s table for fewer than 20 scores begins. Below 20, the table decides how many of your lowest differentials are averaged and whether an adjustment applies; from 20 on, the index is the average of the lowest eight of the most recent twenty.
Is it the best 8 of 20?
Yes, once you have 20 scores: the average of the lowest eight score differentials among your most recent twenty, rounded to the nearest tenth. Older scores drop out as new ones are added, which is why the calculator only counts the last 20 you enter.
Does this calculator apply the soft cap and hard cap?
No. Those limits compare a new index with your Low Handicap Index — the lowest of the previous 365 days — which this page does not know. It also cannot apply exceptional-score reductions or a committee’s adjustments, so treat the result as an estimate and use the figure from your official handicap provider.

Sources

  1. Rules of Handicapping — 5.1a For an 18-hole Score (opens in a new tab)USGA — accessed
  2. Rules of Handicapping — 5.2a For Fewer Than 20 Scores (opens in a new tab)USGA — accessed
  3. Rules of Handicapping — 5.2b For 20 Scores (opens in a new tab)USGA — accessed
  4. Rules of Handicapping — Appendix G: The Golf Course, Course Rating and Slope Rating (opens in a new tab)USGA — accessed
  5. Rules of Handicapping — Definitions (opens in a new tab)USGA — accessed

League, governing-body and team names appear here only to identify the formulas and rules being used. Reign Creative LLC's sports games and calculators are not affiliated with, endorsed by or licensed by any league, team, players' association or athlete, and all names and marks belong to their owners.

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