Golf Handicap Calculator
Turn your scores, course ratings, and slopes into a golf handicap index by averaging your best differentials.
Each round's differential is (score − rating) × 113 ÷ slope. We average the lowest differentials and multiply by 0.96 to get your index.
How it works
Every round you play gets turned into a score differential, which levels the playing field between hard and easy courses. The math is (your score − the course rating) × 113 ÷ the slope, where 113 is the slope of an average-difficulty course.
Once you have a few differentials, only your best ones count. Shoot three to six rounds and we take your lowest few; play more and we take a larger set. That way one bad day at the course doesn't wreck your number.
We average those best differentials and multiply by 0.96 — the bonus-for-excellence factor — to land on your handicap index. Add rounds as you play them and the index updates instantly.
Frequently asked questions
What is slope and course rating?
Course rating is the score a scratch golfer would expect on that course; slope measures how much harder it plays for a bogey golfer. Both are printed on the scorecard and let the formula compare courses fairly.
How many rounds do I need?
You can get a rough index from a single round, but it's shaky. Handicaps are meant to use your best differentials out of your most recent rounds, so the more you enter, the more reliable it gets.
Why multiply by 0.96?
That 0.96 factor is the standard 'bonus for excellence' built into the handicap system. It nudges the average of your best rounds down slightly so the index reflects your potential, not your everyday average.