Golf Handicap Calculator

About the Golf Handicap Calculator

A golf handicap lets players of different abilities compete fairly, on any course. Since 2020, most of the golfing world has used the World Handicap System (WHS), which replaced the older national systems with a single method. Your handicap index is a measure of your demonstrated ability, based on your best recent scores and adjusted for how difficult each course was.

This golf handicap calculator works out an estimated handicap index from your recent rounds. Enter each round's adjusted score, course rating and slope, and it calculates each score differential, picks the right number of lowest differentials for the rounds you have played, and averages them. Add the slope, rating and par of a course to see your course handicap there.

How to Use the Golf Handicap Calculator

In the rounds box, enter one round per line, oldest first: your adjusted gross score, the course rating and the slope rating of the tees you played, for example "90 72.1 128". The course rating and slope are printed on the scorecard.

Enter at least 3 rounds. Only the most recent 20 are used.

Optionally, enter the slope, course rating and par of the course you are about to play to see your course handicap.

How the Handicap Index Is Worked Out

  score differential  =  113 ÷ slope × (adjusted gross score − course rating)
  handicap index      =  average of the lowest differentials from the last 20 rounds
  course handicap     =  index × slope ÷ 113 + (course rating − par)

Step-by-Step Example

Five rounds, then a course with slope 128, rating 72.1 and par 72.

  90 on 72.1 / 128:   113 ÷ 128 × 17.9     =  15.8
  88 on 71.5 / 125:   113 ÷ 125 × 16.5     =  14.9
  95 on 73.0 / 131:   113 ÷ 131 × 22.0     =  19.0
  92 on 72.1 / 128:   113 ÷ 128 × 19.9     =  17.6
  86 on 70.8 / 122:   113 ÷ 122 × 15.2     =  14.1
  Index (lowest 1 of 5):                       14.1
  Course handicap:    14.1 × 128 ÷ 113 + 0.1  =  16.1  →  16

Course Rating and Slope

The course rating is the score a scratch golfer — handicap zero — would be expected to shoot from a set of tees in normal conditions, such as 72.1. The slope rating measures how much harder the course is for a bogey golfer than for a scratch golfer, on a scale from 55 to 155, with 113 as the standard. A higher slope means the course is relatively tougher for higher-handicap players, which is why the differential multiplies by 113 ÷ slope.

Adjusted Gross Score

Before a round counts, each hole is capped at net double bogey: par plus two plus any handicap strokes you receive on that hole. A player who takes a 10 on a par 4 where they get one stroke would record a 7 for handicap purposes. This stops a single disaster from distorting the handicap, and means your index reflects your potential rather than your worst holes.

Official Handicaps

An official handicap index is issued by a golf club or national association, which records every acceptable score, applies a playing conditions calculation for unusual weather, and applies caps that limit how fast an index can rise. This calculator gives a close estimate using the same core method, which is useful for tracking your game or for friendly matches, but only your club's figure is official for competitions.

Nine-Hole Rounds

Under the current rules, nine-hole scores are combined with an expected score for the other nine holes to create an 18-hole differential. For simplicity, this calculator takes 18-hole rounds; enter two nine-hole rounds played on the same course as one 18-hole round, adding their scores and ratings.

How the Index Moves

Because only your best differentials count, a bad round rarely raises your index much: it simply may not be among the lowest. A good round, on the other hand, often replaces the highest of your counting differentials and lowers the index straight away. As old rounds drop out of the most recent 20, the index can drift up or down even if you do not play differently. With 20 rounds recorded, the index is the average of the best 8, which represents a good day rather than an average one — a typical round is usually two or three shots worse than your handicap suggests.

Playing Handicap in Competitions

For competitions, your course handicap may be adjusted again to a playing handicap, which applies a handicap allowance depending on the format: 95 percent in individual stroke play, 85 percent in four-ball stroke play, and other figures for match play and team formats. In matches between two players, the lower handicap usually plays off scratch and the other receives the difference in strokes. Your club's competition rules set the allowances.

Getting Better Estimates

Enter as many recent rounds as you have, up to 20, in the order you played them, and make sure each uses the rating and slope for the tees you actually played. Rounds from forward or back tees on the same course have different ratings. Scores from casual rounds count too under WHS, as long as they are played under the rules of golf and entered promptly.

Understanding Your Result

Handicap index is your estimated index to one decimal place.

Differentials used shows the lowest differentials and any adjustment.

All differentials lists every round's differential, oldest first.

Course handicap gives your strokes on the course you enter.

Worth knowing reminds you to enter rounds oldest first.

When Should You Use This Calculator?

Tracking your progress round by round.

Estimating a handicap before joining a club.

Checking your club's figure.

Setting up friendly matches fairly.

Working out your strokes on a new course.

Common Mistakes

Using gross scores without the net double bogey cap.

Using the par instead of the course rating.

Entering rounds in the wrong order, so old rounds are counted.

Mixing up slope and course rating.

Treating the estimate as an official handicap for competitions.