Golf Handicap Calculator

The World Handicap System (WHS) replaced the old CONGU and USGA systems in 2020 and is now the global standard for amateur handicaps. Your Handicap Index is the average of your 8 best score differentials from your last 20 rounds, regardless of where they were played. A score differential is calculated as (113 / slope rating) x (gross score - course rating). The 113 is the slope of a 'standard' course; the formula adjusts your score to account for the difficulty of the course you played.

If you have fewer than 20 rounds in your record, the system uses fewer differentials in the average (5 of 6, 6 of 9, 8 of 20 etc.). You need a minimum of 3 scores to receive a Handicap Index. The calculator handles this scaling automatically; just keep entering rounds as you play them and the index updates after each one.

Your Handicap Index is the portable number, the same wherever you play. Your Course Handicap is your Index translated to a specific course. The conversion is Course Handicap = Handicap Index x (slope rating / 113) + (course rating - par). On a course with a slope of 130 (harder than standard), a 12 Index becomes a Course Handicap of around 14; on a slope of 110 (easier than standard), the same Index becomes about 11.

This is why two golfers with the same Handicap Index can have different Course Handicaps when playing the same course from different tees. The slope and rating of each tee box are calculated separately, so playing from the white tees vs the yellow tees changes your Course Handicap. The calculator computes both numbers for any course you enter, so you can sense-check what you should be playing off in a club competition.

Course rating is the score a scratch golfer (someone with a Handicap Index of 0) is expected to shoot on that course under normal conditions. Slope rating is how much harder the course gets for higher handicap players, on a scale where 113 is 'standard'. The values come from a USGA-approved course rating panel; you do not estimate them yourself.

A par-72 course can have a course rating of 68 (easy), 70 (typical) or 74 (very hard). The calculator includes presets for common UK course profiles, but for actual handicap submission you need the exact figures, which are printed on the scorecard or available on the course's website. England Golf, the R&A and the USGA all publish rating data for affiliated clubs. The [tournament bracket generator](/tournament-bracket-generator) is useful for running club competitions where everyone needs to play off their correct course handicap.

WHS uses your best 8 differentials out of your most recent 20 rounds, not all 20. This rewards consistency: your worst rounds (sliced 9-iron into the trees, three-putted from 8 feet, two lost balls on the back nine) do not count. The result is a 'demonstrated ability' figure that reflects what you can shoot when playing reasonably well, not your average performance.

There is also a soft cap and hard cap on rapid handicap changes. If your Index suddenly jumps because of a string of bad rounds, the system limits the increase to 5.0 over your low Index of the past 12 months. This stops the system from inflating your handicap unfairly fast on a temporary slump. Likewise, exceptionally good rounds trigger an 'exceptional score' adjustment that pulls your Index down faster than the 8-of-20 average alone would suggest.