Golf Handicap Calculator
Enter one round per line — score, course rating, slope rating — and get an estimated handicap index worked out the World Handicap System way, the score differentials behind it, and a course handicap and net score for your latest round.
A World Handicap System method, simplified: no playing conditions calculation, no exceptional score adjustments, and no extra adjustment for records of only 3, 4 or 6 scores. An official handicap can only be issued through an authorized golf club or WHS system.
Formula and calculation
Worked example
With those eight rounds the table averages your lowest 2 differentials — 15.25 — and 0.96 turns that into a handicap index of 14.64. At the course you played most recently the course handicap is 14.81, so the 90 you shot becomes a net 75.19.
An estimate, not an official handicap
A handicap index is only official when an authorized golf club or a national WHS system issues it from scores posted under the Rules of Handicapping — GHIN in the United States and the national federations elsewhere. Those systems also apply the playing conditions calculation, exceptional score reductions and the safeguards this page leaves out, and they keep a peer-reviewed record behind your name. Use the number here to see roughly where your game sits, to sanity-check a posted index, or to work out how many strokes you would get at a new course — not to enter a competition.
Why the index settles down as you post more rounds
With three to five rounds the WHS table averages a single differential, so one bad day or one career round swings the index by several strokes. From six rounds the table averages your two best, and by twenty rounds it is the best 8 of 20 — a much steadier number, because only the good rounds survive and the rest can only lower them. That is also why the index usually falls quickly for a new golfer: every fresh personal best replaces one of the counting rounds, while a bad round simply drops out of the pool.
What the results mean
- Handicap index
- Your estimated Handicap Index: the average of your best recent score differentials, multiplied by 0.96. Lower is better — a club player is often somewhere between 10 and 25, a scratch golfer is near 0, and a plus handicap goes negative.
- Rounds used
- How many rounds went into the calculation. Everything you entered is capped at your most recent 20, which is all the World Handicap System looks at — anything older is listed in the table but not counted.
- Differentials averaged
- How many of your lowest score differentials were averaged. The WHS table uses fewer as your record grows: the lowest 1 of 3 to 5 rounds, 2 of 6 to 8, 3 of 9 to 11, 4 of 12 to 14, 5 of 15 to 16, 6 of 17 to 18, 7 of 19, and the lowest 8 of a full 20.
- Average of those differentials
- The average of those lowest differentials, before the 0.96 factor is applied. This is the number your index is built on, and it is what a handicap committee looks at when it reviews a score record.
- Course handicap at your latest course
- The strokes you receive at the course of your most recent round: Handicap Index × slope ÷ 113 + (course rating − par). WHS publishes course handicaps as whole numbers, so round this value when you play.
- Net score for that round
- Your gross score in that latest round minus the course handicap — how you played against your own standard rather than against par. A net score below the course's par is a good day.
Frequently asked questions
How do I calculate my golf handicap?
Each round becomes a score differential — (score − course rating) × 113 ÷ slope. The World Handicap System averages your lowest differentials from your most recent 20 rounds and multiplies by 0.96. This calculator does those two steps from the scores you paste in.
How many scores do I need for a handicap?
Three rounds (54 holes) is the minimum under the World Handicap System, and the table keeps averaging more of your best scores until you have 20 on record. To get an official index those scores have to be posted through a golf club or an authorized WHS system, not worked out by hand.
What is a course handicap?
It converts your index to strokes on one specific course: index × slope ÷ 113 + (course rating − par). A 12.0 index on a 125-slope course rated 72 against a par of 72 becomes 12 × 125 ÷ 113 = 13.3, which WHS rounds to 13 strokes.
Why does the WHS multiply by 0.96?
The factor builds in the statistical edge a low handicapper holds. Averaging only your best rounds already makes the number strong; the 0.96 pulls it back about 4% so that a lower handicap has to give back a little more when playing against higher ones.