Estimate your handicap
Add your most recent 18-hole rounds, oldest first: the score, and the course's rating and slope from the scorecard, or tap Pick the course instead and choose it from 13,000+ courses. Rounds that count are highlighted.
Enter your 18-hole scores and each course's rating and slope, or pick the course.
Oldest round first. Use your adjusted gross score: each hole counts at most net double bogey. An unofficial estimate, not an official handicap. Rounds are saved in this browser; a picked course's score goes to greensgolf.app only to work out its differential, and isn't kept.
How it's worked out
Each round becomes a score differential: how well you played against what the course should take, scaled to a course of average difficulty.
Differential = (score − course rating) × 113 ÷ slope
A 92 on tees rated 71.5 with a slope of 128: (92 − 71.5) × 113 ÷ 128 = 18.1.
Your handicap is then the average of your lowest differentials. With 20 rounds that's the lowest 8. With fewer, the World Handicap System uses fewer, and takes a little off when you have very few:
| Rounds | Lowest used | Adjustment |
|---|---|---|
| 3 | 1 | −2.0 |
| 4 | 1 | −1.0 |
| 5 | 1 | 0 |
| 6 | 2 | −1.0 |
| 7–8 | 2 | 0 |
| 9–11 | 3 | 0 |
| 12–14 | 4 | 0 |
| 15–16 | 5 | 0 |
| 17–18 | 6 | 0 |
| 19 | 7 | 0 |
| 20 | 8 | 0 |
Six rounds with differentials 18.1, 16.6, 19.8, 19.3, 14.8 and 19.0. Six rounds use the lowest 2: (14.8 + 16.6) ÷ 2 = 15.7, minus 1.0 = an estimated handicap of 14.7.
Which score to enter
Use your adjusted gross score: your total with any blow-up hole cut to the most it can count, which is net double bogey (par + 2 + your strokes on that hole). A 9 on a par 4 where you get one stroke counts as a 7. The Strokes Calculator shows that cap for every hole.
What an estimate leaves out
An official handicap from a golf association adds a few safeguards this calculator doesn't: an adjustment on days when the course played unusually hard or easy, limits on how fast a handicap can rise, and a cut after an exceptional score. It also takes nine-hole rounds, which this calculator doesn't yet. How nine-hole rounds count.
For casual golf and matches with friends, the estimate is plenty. For club events you'll need an official handicap: how to get one without a club.
Updated November 13, 2026 by the Greens team.