Golf Handicap Index Calculator (WHS Style)
Enter your most recent rounds (minimum 3, maximum 20) to estimate your Handicap Index. Use adjusted gross score, course rating, and slope rating for each round.
Optional: Course Handicap
Handicap estimate follows standard World Handicap System logic, including score-count rules for fewer than 20 rounds and the early-round adjustment.
How to Figure a Golf Handicap
If you’ve ever asked, “How do I figure my golf handicap?” you’re asking a great question. A handicap lets players of different skill levels compete on fairer terms. It reflects your scoring potential, not just your average score.
This figure golf handicap calculator uses common World Handicap System (WHS) concepts to estimate your Handicap Index from recent rounds.
The Core Handicap Formula
Each score is turned into a score differential with this formula:
(Adjusted Gross Score - Course Rating) × 113 ÷ Slope Rating
- Adjusted Gross Score (AGS): Your score after any max-hole adjustments.
- Course Rating: The expected score for a scratch golfer from that tee.
- Slope Rating: Relative difficulty for a bogey golfer (usually 55–155).
Your Handicap Index is then based on the lowest differentials from your recent rounds, using a rule table depending on how many rounds you have posted.
How This Calculator Works
1) Enter recent rounds
Add between 3 and 20 rounds. More rounds produce a more stable and realistic index.
2) The tool calculates each differential
Every round is standardized with rating and slope, so a tough course and an easier course are measured consistently.
3) Lowest differentials are selected
For example, with 20 scores, the lowest 8 differentials are averaged. With fewer rounds, WHS uses smaller sample rules and may apply a small adjustment for very short histories.
4) Handicap Index is truncated
The final value is truncated to one decimal place, matching common handicap formatting behavior.
Quick Example
Suppose one round has:
- Adjusted Gross Score: 88
- Course Rating: 71.2
- Slope Rating: 128
Differential = (88 - 71.2) × 113 ÷ 128 = 14.8 (approx). The calculator repeats this for each entered round, takes the required low differentials, and returns your estimated Handicap Index.
Tips for Better Accuracy
- Use adjusted scores, not raw blow-up totals.
- Enter scores in recent order and include a full set of rounds when possible.
- Double-check course rating and slope from the exact tees played.
- Recalculate regularly as new rounds replace old ones.
Handicap Index vs. Course Handicap
Your Handicap Index is portable across courses. Course Handicap is specific to one course and tee set. That’s why this page includes optional target-course inputs (slope, rating, and par) so you can estimate strokes for an upcoming round.
Final Note
This tool is a practical estimator for golfers who want to quickly figure golf handicap numbers on their own. Official handicaps should still come from authorized systems and score posting platforms in your golf association.