How to Calculate a Golf Handicap

To calculate a golf handicap, turn each round into a score differential, average your best differentials, and then convert that average into strokes for the course you are playing. The official World Handicap System (WHS) averages the lowest 8 of your last 20 differentials. A league that plays one course every week can use a simpler formula, and many do.

Want to skip the math? Use the free Golf Course Handicap Calculator to get your strokes on any course and tees, or the Golf Handicap Tracker to keep a running index.

What a Handicap Does

A handicap lets a 5 and a 25 play for the same prize. Each player subtracts strokes from their gross score, and the net scores are compared. If the numbers are right, any player in the field can win on a given day. If they are wrong, the best players take every prize or the weakest players get hot and the whole group stops trusting the results.

The Official Method: Score Differential and Handicap Index

The WHS has three steps.

Step 1: Turn each round into a score differential. The differential compares your score to the course’s difficulty:

Score differential = (113 ÷ Slope Rating) × (Adjusted Gross Score − Course Rating − PCC)

Course Rating is what a scratch golfer is expected to shoot. Slope Rating (55 to 155, with 113 as average) measures how much harder the course plays for a typical bogey golfer. PCC is a daily adjustment for unusual conditions and is usually zero. Adjusted gross score is your score after capping each hole at net double bogey.

Step 2: Keep your last 20 differentials. Once you have 20 scores, the system uses the lowest 8. Fewer than 20 scores use a smaller sample, and the table in the WHS rules sets how many count.

Step 3: Average the best ones. The average of your lowest 8 differentials is your Handicap Index.

A Worked Example

You shoot 88 at a course with a 71.2 rating and a 128 slope.

(113 ÷ 128) × (88 − 71.2) = 0.883 × 16.8 = 14.8

That is one differential. Say your last 20 look like this:

9.8, 12.4, 14.1, 11.2, 15.6, 13.0, 10.9, 16.2, 12.8, 14.7, 11.5, 13.4, 17.0, 10.4, 12.1, 15.0, 13.8, 11.9, 14.3, 12.6

Your lowest 8 are 9.8, 10.4, 10.9, 11.2, 11.5, 11.9, 12.1 and 12.4. They add up to 90.2, and 90.2 ÷ 8 = 11.275. Your Handicap Index is 11.3.

From Index to Strokes: the Course Handicap

An index travels with you from course to course. The number of strokes you get on a given day depends on where you are playing:

Course Handicap = Handicap Index × (Slope ÷ 113) + (Course Rating − Par)

With an 11.3 index on a course rated 71.5, par 72, slope 135:

11.3 × (135 ÷ 113) + (71.5 − 72) = 13.5 − 0.5 = 13.0

You get 13 strokes. On an easier course with a 110 slope, the same player would get fewer. A handicap built on one course gets unfair when the league changes venues.

Why a League Often Needs Its Own Formula

The WHS assumes players post scores from 18-hole rounds under the standard rules of golf, and it needs 20 of them. Most weekly leagues don’t fit that. In a nine-hole league, a full 20-score history takes 40 rounds. A league that plays pick and place, or caps every hole at a maximum score to keep pace up, produces scores that don’t belong in an official record.

So many leagues build a simpler formula: pick a window of recent rounds, average the best ones, and apply a multiplier. The multiplier sets where winning net scores land. Too high and the net scores run above par for everyone. Too low and the good players win too often.

How We Tuned Ours on the Mulligan Tour

The Mulligan Tour started in 1999 with best 3 of the last 6 tournaments, times 0.80. It worked for years because we played 13 to 16 tournaments a season and the group was more social than competitive.

As the Tour grew, handicaps started swinging. A 12 could become a 15 in two weeks. It also opened up a way to game the system. If you weren’t playing your A game on a given day, it could pay to post a higher score. As your good rounds dropped out of the window, your B and C rounds took their place and pushed your handicap up. You could add a few strokes in 2 or 3 weeks without sabotaging your season.

About 10 years ago we moved to best 5 of the last 10. We started with a 0.90 multiplier. Average gross scores dropped, so the sandbagging had mostly stopped, but handicaps stayed high and winning net scores weren’t landing around even par, which is where we wanted them. The next year we moved to 0.85. It has been the right number since.

New players are a separate problem, because 10 events can take 2 to 4 months. We open each season with two Qualifying School events that exist only so new players can post scores. After their third event, a new player gets best 1 of 3 at 0.50, then best 2 of 4 at 0.55, then best 3 of 5 at 0.60, and so on until they reach the regular formula. Most of our rookies this year have won a tournament.

We also can’t post our scores for a USGA handicap. Our pace-of-play rules are pick and place, a 3-putt maximum and a quadruple bogey maximum. That hasn’t held us back. Trial and error got us a system that works for the group, and new players have fun from their first week.

The Biggest Handicap Mistakes First-Time Admins Make

Handicaps are the hardest part of running a league. They are supposed to even the field, and a bad system can end a league before the first season finishes. A lot of small things sit inside a posted score: weather, a blow-up hole, a missed week, a harder course. Using a straight average. If you play the same course every week, an average looks like the simple, fair choice. It has two problems. A 15 handicap finds it easier to beat their average by 7 strokes than an 8 does, so the high handicaps win more. And with no cap on blow-up holes, an average rewards sandbagging. Nothing kills a league faster than a few players who are good at math working out whether they really need to make that 3-foot putt.

Copying the full WHS. A league that tries to reproduce the official system by hand takes on all of its complexity without the infrastructure behind it. A nine-hole league would need 40 rounds.

Having no limits on movement. If a handicap can jump 3 strokes in a week, players will find out how to make it jump. Scoring caps and a limit on how far a handicap can move in a set period keep the numbers stable.

Having no plan for new players. A rookie with two scores has no handicap, and a rookie who sits out for a month shows up with a number nobody trusts. Decide before the season how a player gets from zero rounds to a full handicap.

Having no way to settle a dispute. Players track their own numbers. If a posted handicap is off from what they expect, you will hear about it.

Why Spreadsheets Break Down

Before LeaderBoard Caddie, I ran Mulligan Tour handicaps in a multi-tab spreadsheet. I entered each player’s gross score, then the course’s par, slope and rating to get a differential. I copied the differentials to a second tab, where a formula took the best 3 of the last 6, averaged them and multiplied by 0.80. Then I copied every handicap and posted it on the website.

For 40 players that took about an hour per tournament. We run about 40 tournaments a year, so handicaps alone cost me a full work week, unpaid. I put scores in the wrong cell more than once and had to backtrack to find the error.

Several years ago a player called because his posted handicap was off by one tenth of a point. He kept me on the phone for 20 minutes, going through his scores and his math, and wouldn’t hang up until I found the mistake. I had typed an 82 where the score was an 83, three weeks earlier.

Calculating League Handicaps in LeaderBoard Caddie

LeaderBoard Caddie can run a WHS-style handicap with your own settings, so players get a full handicap quickly and you pick a multiplier that puts net scores where you want them. If you prefer averages, it can do that too. Add scoring caps and a limit on how far a handicap can move in a given period. It also handles handicaps for team events such as scrambles and alternate shot. See best ball for how handicaps work in team formats.

Every number that feeds a player’s handicap is visible. After we switched, I got an hour back each week, and I no longer had to defend my spreadsheet to anyone. For more on setting up a formula for your own group, see our guide to golf league handicaps or the golf handicap hub.

FAQ

What is net double bogey?

It is the highest score that counts on a hole when you post a round: par plus 2, plus any handicap strokes you receive on that hole. A player who gets one stroke on a par 4 counts a maximum of 7.

How many rounds do you need to get a handicap?

Under the WHS you need scores totaling 54 holes, which can be any mix of 18-hole and 9-hole rounds. Leagues set their own minimums. On the Mulligan Tour, new players get a handicap after their third event.

Do 9-hole scores count toward a handicap?

Yes under the WHS. Two 9-hole scores combine into one 18-hole differential. A nine-hole league therefore needs about 40 rounds to fill a 20-score history, which is one reason leagues use a shorter window.

What is the difference between a handicap index and a course handicap?

The index is a portable measure of your ability. The course handicap converts it to strokes for a specific course and set of tees using slope, rating and par.

Can a league use its own handicap system?

Yes. A league doesn’t need to follow the WHS unless it wants to post scores for an official handicap. A league formula needs a fixed window, a multiplier, a plan for new players and a way to settle disputes.

What multiplier should a league use?

It depends on where you want winning net scores to land. The Mulligan Tour tried 0.80 and 0.90 before settling on 0.85 with a best 5 of 10 window. Check a season of results, and if the winning net scores run well above or below par, move the multiplier.

How do you stop sandbagging?

A longer window, caps on blow-up holes and a limit on how far a handicap can move all make it harder.