How to Calculate Your Golf Handicap: Formula and Worked Example

To calculate your golf handicap, turn each round into a Score Differential^™ with the formula (113 ÷ Slope Rating^™) × (adjusted gross score − Course Rating^™ − PCC), then average your 8 best Score Differential values from your most recent 20 scores and round to one decimal. The result is your Handicap Index^®.

This guide shows how to calculate a golf handicap by hand, with real arithmetic: your Course Handicap^™, net double bogey, the Score Differential, the best 8 of 20, and what to do with fewer than 20 scores.

If you would rather skip the math, TheGrint applies net double bogey and works out your handicap each time you post a hole-by-hole score, and U.S. golfers can buy an official USGA^® Handicap ID inside the app.

What do you need to calculate a golf handicap?

You need your hole-by-hole scores and the Ratings of the tees you played. Under the World Handicap System^™ (WHS^™), each round is measured against the difficulty of the course, not against par.

• Hole-by-hole scores. Needed to cap each hole at net double bogey.
• Course Rating. What a scratch golfer is expected to shoot from those tees, such as 72.4.
• Slope Rating. How much harder the course plays for a bogey golfer than for a scratch golfer, from 55 to 155. 113 is standard.
• Par and stroke index. From the scorecard; the stroke index shows where your handicap strokes fall.
• The day's PCC. The playing conditions calculation (PCC), worked out by the handicap system each day. Usually 0.

The worked example below follows one golfer through every step: a Handicap Index of 14.2, playing tees with a Course Rating of 72.4, a Slope Rating of 131 and a par of 72.

Step 1: How do you find your Course Handicap?

Your Course Handicap is your Handicap Index converted for the tees you are playing, and it comes first because it sets your strokes on each hole. The USGA gives the formula as "Handicap Index x (Slope Rating / 113) + (Course Rating – par)" (USGA: World Handicap System FAQs).

For our golfer: 14.2 × (131 ÷ 113) + (72.4 − 72) = 16.46 + 0.4 = 16.86, which rounds to a Course Handicap of 17. The USGA notes the number "is rounded to the nearest whole number when applying net double bogey adjustments", and that a mobile app or the Course Handicap table at the course "will do the math for you".

A Course Handicap of 17 means one handicap stroke on each hole with a stroke index of 1 through 17, and none on the hole with stroke index 18.

Your Playing Handicap^™ is the Course Handicap multiplied by the handicap allowance for the format of play, then rounded. It sets your strokes in a competition but plays no part in calculating your Handicap Index.

Step 2: How do you adjust your score with net double bogey?

You adjust your score by capping every hole at net double bogey: par plus 2 plus any handicap strokes you receive on that hole. The capped total is your adjusted gross score, the number the handicap formula uses.

In the USGA's words, "the maximum score for each hole played is limited to a net double bogey, equal to double bogey plus any handicap strokes you are entitled to receive based on your Course Handicap." Golfers who are posting their first scores to establish a Handicap Index use a different cap: "the maximum hole score is limited to par + 5."

Our golfer shoots a gross 96 with two bad holes:

1. A 9 on a par 4 with stroke index 3. Net double bogey is 4 + 2 + 1 handicap stroke = 7. The hole counts as 7, two strokes fewer than he took.
2. A 6 on a par 3 with stroke index 18. No handicap stroke on this hole, so net double bogey is 3 + 2 = 5. The hole counts as 5, one stroke fewer.
3. Every other hole was within its net double bogey and counts as played.

Gross 96 minus 3 strokes gives an adjusted gross score of 93. That is the point of the cap: one blow-up hole cannot wreck the round.

Step 3: How do you calculate a Score Differential?

A Score Differential is your adjusted gross score measured against the Course Rating and scaled by the Slope Rating, so rounds on easy and hard courses can be compared on one scale. The USGA gives the formula as "(113 / Slope Rating) x (Adjusted Gross Score - Course Rating - PCC adjustment)".

For our golfer on a normal day, with a PCC of 0: 113 ÷ 131 × (93 − 72.4 − 0) = 0.8626 × 20.6 = 17.8.

The PCC exists because some days play harder or easier than the Ratings expect. Each evening the system checks whether scores were "significantly higher or lower than the expected scores of the players who made them", and if so applies "a PCC adjustment between -1 and +3" to the Score Differential of everyone who played. A positive number means the course played harder than expected.

Had the PCC that day been +1, the same 93 would give 113 ÷ 131 × (93 − 72.4 − 1) = 16.9, nearly a full stroke better. As the USGA puts it, "a score of 80 on a difficult course may be a better performance than a 77 on an easier one."

Step 4: How does a Score Differential become a Handicap Index?

Once you have 20 scores, your Handicap Index is the average of your 8 lowest Score Differential values from your most recent 20, rounded to one decimal. The USGA puts it as "calculated by first averaging the best 8 Score Differentials out of your most recent 20 scores."

Say our golfer's 8 lowest differentials in his last 20 are 12.4, 13.1, 13.6, 14.0, 14.3, 14.8, 15.2 and 15.9. They add up to 113.3, and 113.3 ÷ 8 = 14.16, so his Handicap Index is 14.2.

Now look at the 17.8 from Step 3. It is higher than 15.9, his eighth-best differential, so it does not make the best 8, and as long as the score dropping out of his 20 wasn't one of those 8, his Handicap Index stays at 14.2. It can still count later, as older, lower scores drop out of the most recent 20.

The average is then checked against safeguards built into the calculation:

• Soft cap and hard cap. If the new value is more than 3.0 strokes above your Low Handicap Index^™ from the previous 365 days, further upward movement is slowed by 50%, and it can never rise more than 5.0 strokes above that low point. The USGA's example: a Low Handicap Index of 10.0 and an 8-of-20 average of 13.4 give a Handicap Index of 13.2.
• Exceptional score reduction. A Score Differential at least 7.0 strokes better than your Handicap Index takes 1 stroke off your Handicap Index; 10.0 or more better takes 2 strokes off.
• Maximum. "The maximum Handicap Index is 54.0 for all players."
• Timing. A Handicap Index "is updated the day after a score is posted, at midnight local time based on the location of your Allied Golf Association."

What if you have fewer than 20 scores?

With fewer than 20 scores, you average fewer differentials, and with 3 to 6 scores you also apply a small adjustment. You need scores from 54 holes, in any mix of 9- and 18-hole rounds, before you have a Handicap Index at all. Rule 5.2a of the Rules of Handicapping sets out the full table (USGA: Rule 5.2a):

Two examples. With three scores whose differentials are 15.3, 15.2 and 16.6, the Rule's own example takes the lowest, 15.2, and subtracts 2.0, for an initial Handicap Index of 13.2. With six scores, take the two lowest, say 16.3 and 17.5, average them to 16.9, and subtract 1.0 for a Handicap Index of 15.9.

What are the most common mistakes when calculating a golf handicap?

The most common mistake is running the formula on your gross score instead of your adjusted gross score. Each of these pushes a hand calculation away from the official number.

• Skipping net double bogey. Uncapped blow-up holes inflate the differential.
• Measuring against par. The formula uses the Course Rating, not par. On tees rated 72.4 with a par of 72, using par makes every round look 0.4 strokes worse before slope is applied.
• Ignoring the PCC. A hand calculation assumes 0; if the system applied +1 or −1, your figure will not match.
• Averaging every round. Only the best 8 of the most recent 20 count, so a simple average comes out several strokes higher.
• Quoting a Course Handicap as a Handicap Index. A 17 on one course is a Course Handicap. The portable number is the one with a decimal.

For why a higher score can count more than a lower one, see why an 83 may count toward your handicap but an 82 might not.

Can a golf handicap calculator do the math for you?

Yes. TheGrint works as a golf handicap calculator that runs every time you post a score, so when you post hole by hole you never cap holes or look up Ratings yourself.

• Net double bogey is applied for you. Post hole by hole and TheGrint calculates your adjusted gross score, shown on the website beneath the scorecard. Post only a total score and you enter the adjusted gross score yourself.
• Scorecard photos too. The Scorecard Picture Service, where human reviewers transcribe a photo of your card, applies the same adjustment. It is a Pro feature; Free members get 3 trial uploads.
• An estimated handicap from the scores you enter. TheGrint shows an estimate until you hold an official Handicap Index, or a GHAP handicap outside the United States.
• The official number in the same app. U.S. golfers can buy the official USGA Handicap ID inside TheGrint at their Allied Golf Association's price, with no markup, or link a GHIN^® number they already have so scores synchronize. Revisions are processed nightly.
• Every adjustment shown. On a linked official record, an E beside a score marks an exceptional score reduction and an X marks a PCC adjustment. See what the letters on your scorecards list mean.
• The other end of your game. TheGrint's Anti-Handicap averages your 8 highest differentials of your last 20 instead of your 8 lowest. It is a TheGrint performance metric, not an official handicap.

An estimated handicap in any app is not an official Handicap Index. See how to get an official golf handicap and what a golf handicap is and how it works, or look up a golfer's handicap by name or Handicap ID with TheGrint's golf handicap lookup.

Frequently Asked Questions

How do you calculate net double bogey?

Add 2 to the par of the hole, then add any handicap strokes you receive there based on your Course Handicap and the hole's stroke index. With a Course Handicap of 17, a par 4 with stroke index 3 has a net double bogey of 7. Any higher score on that hole counts as 7 for handicap purposes.

How is a 9-hole score used in a handicap calculation?

A 9-hole score is turned into a 9-hole Score Differential using the Ratings of the nine holes you played. The system then combines it with an expected Score Differential based on your current Handicap Index to produce an 18-hole Score Differential, so a good nine counts as a good 18 and an average nine as an average one.

Why didn't my handicap go down after a good round?

Either the round did not make your best 8 of your most recent 20, or it has not been processed yet. A Handicap Index updates the day after a score is posted. If your new Score Differential is higher than your eighth-best, it will not change the number now, though it can count later as older scores drop out.

Does the PCC make my handicap go up or down?

It can do either, through your Score Differential. The playing conditions calculation adjusts the differential of everyone who played that course that day, by between −1 and +3. A positive PCC means the course played harder than expected and lowers each differential; a negative PCC raises it. On most days the PCC is 0.

Can you calculate your own official handicap?

You can do the arithmetic yourself, but you cannot issue an official Handicap Index yourself. In the United States only the USGA calculates it, through an authorized golf club and your Allied Golf Association, and it includes adjustments such as the PCC and the soft cap that a hand calculation cannot see. A hand-calculated figure is an estimate.

Post your next round and let TheGrint do the math

Enter your next round hole by hole in TheGrint and your net double bogey, Score Differential and handicap are worked out for you. When you want the official number, buy the USGA Handicap ID inside the app (U.S.) or link your GHIN^® number, and post from the same scorecard you use for GPS, stats and games. Get started with TheGrint.

World Handicap System™, WHS™, Handicap Index®, Low Handicap Index™, Score Differential™, Course Handicap™, Playing Handicap™, Course Rating™ and Slope Rating™ are trademarks owned or licensed by the United States Golf Association® (USGA®) and/or The R&A. GHIN® is a registered trademark of the USGA. All rights reserved.