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GameCalc
One round, one quick handicap estimate.
A handicap differential takes your score, subtracts the course rating (how hard the course plays for a scratch golfer), and adjusts for slope (the difficulty gap between a scratch and bogey golfer) — this standardizes scores across different courses.
The USGA Handicap Index uses the best 8 of your most recent 20 differentials, then multiplies by 0.96 — a single-round estimate is a rough approximation, but gives you a starting point before you build up a full history.
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OpenLast updated: August 2026
Handicap Index
12.5
What you entered
Adjusted gross score minus course rating
85 - 72= 13Handicap differential
(85 - 72) x 113 / 113= 13Handicap index (single-round simplified)
13 x 0.96= 12.48Result
Handicap Index: 12.5