The golf handicap cheat sheet — GA, course, daily, social

Handicaps are the bit of social golf that everyone vaguely understands until someone asks "wait, how does that work?" — and then nobody knows. This is the cheat sheet you can keep in your back pocket the next time you're running a comp and someone's playing handicap doesn't make sense.

Australia uses the World Handicap System (WHS), administered by Golf Australia. Most of the maths is the same as the USA, UK, and most of the world — but a few of the terms are slightly different, and the GA-specific bits are where social comps usually get tripped up.

The terms you actually need to know

There are four numbers in the system. Confusingly, three of them are called "handicap" and one is called something else.

1. GA handicap (the headline number)

Your GA Handicap (sometimes just called "handicap index" elsewhere in the world) is a number from 0.0 to 54.0 representing how many strokes you'd score over par on a course of average difficulty. A 12.0 GA handicap means you'd play 84 on a par-72 course of average difficulty if you played to your form.

It's calculated from the best 8 of your most recent 20 rounds, slope-adjusted. New rounds replace old. Bad rounds outside your best 8 don't count toward the number.

This is the number that follows you around. It doesn't change between courses.

2. Course rating

The course rating is the score a scratch golfer is expected to shoot on this course from these tees, on a day of normal weather and pace. Usually a decimal — 70.5, 72.1, 74.3. Printed on the scorecard, set by the state golf association.

A higher course rating means a harder course. A par-72 course with a 73.5 rating is harder than its par suggests.

3. Slope rating

The slope rating is how much harder the course is for a bogey golfer compared to a scratch golfer. Range is 55 to 155. Standard difficulty is 113.

A slope of 130 means the course punishes mid-handicappers significantly more than scratch players (think: forced carries, tight fairways with rough). A slope of 100 means the course plays roughly the same difficulty for everyone (think: short, open, forgiving).

Slope is where the most confusion lives — higher slope = the course penalises higher handicappers more. So a 20-handicapper at a high-slope course should get more strokes than the same 20-handicapper at a low-slope course.

4. Daily handicap (the playing number)

Your daily handicap is the GA handicap adjusted for the specific course you're playing today.

The formula:

Daily handicap = GA handicap × (slope rating ÷ 113) + (course rating − par)

Worked example:

• Your GA handicap: 14.0
• Course rating: 71.2
• Slope rating: 128
• Par: 72

Daily handicap = 14.0 × (128 ÷ 113) + (71.2 − 72)
              = 14.0 × 1.133 + (−0.8)
              = 15.86 − 0.8
              = 15.06
              → 15 (rounded)

So today, on this course, you play off 15, not 14. The course is harder than average, so you get an extra stroke.

If you'd played a flatter course with slope 105 and rating 70.0 against the same par:

Daily handicap = 14.0 × (105 ÷ 113) + (70.0 − 72)
              = 14.0 × 0.929 + (−2.0)
              = 13.01 − 2.0
              = 11.01
              → 11 (rounded)

Same player, same skill, but they'd play off 11 on the easier course. That's the whole point — slope and rating mean a 14-handicapper at one course is comparable to a 14-handicapper at another.

This calculation is automatic in most golf apps (including The Nineteenth, which does it per round on every course your group plays). You only need to do the maths by hand if you're running an old-school spreadsheet comp.

Stroke index — how strokes get distributed across the holes

Once you know your daily handicap, you need to know which holes you receive strokes on.

Every hole on every scorecard has a stroke index from 1 to 18. Stroke index 1 is the hardest hole. Stroke index 18 is the easiest.

If your daily handicap is N, you receive one stroke on the N hardest holes — i.e. stroke index 1 through N.

• Daily handicap 5: strokes on SI 1, 2, 3, 4, 5
• Daily handicap 12: strokes on SI 1 through 12
• Daily handicap 22: strokes on every hole (1–18), plus a second stroke on SI 1–4

That second-stroke wrap is where most spreadsheet comps go wrong. The maths is: divide by 18, take the floor for "strokes on every hole", remainder is "extra stroke on the hardest N holes". Most apps handle this automatically.

Competition allowance

For formal comps, GA recommends multiplying the daily handicap by a competition allowance — typically:

• Individual strokeplay: 95%
• Singles matchplay: 100% (full handicap to the higher player)
• Stableford: 100% (informal AU social default; some clubs run 95%)
• Foursomes / pairs: various — check the GA handbook for the specific format

This is meant to prevent the (rare) situation where a player on a 28 handicap wins every comp on net score because their GA handicap was set by 20 rounds of terrible play they're now improving from.

For most social comps, 100% is fine and easier to understand. Use 95% if your group has a competitive edge and someone keeps winning the order of merit by 10 points.

What if a player doesn't have a GA handicap?

This is most social comps. Half the players are not Golf Australia members, just mates who play occasionally.

Three reasonable ways to set a social handicap:

Option 1 — Self-report and verify

Ask the player to tell you what they typically shoot. Subtract par, that's their handicap. Run them for 3–4 comps with that number — if they win every time, drop their handicap. If they're 20+ points behind, raise it.

Most social groups settle on a fair number within 3–4 rounds.

Option 2 — Use a tracking app

Several apps (including The Nineteenth, which tracks a per-group social handicap) maintain a rolling handicap based on the rounds you actually play. After 5+ rounds, the number is usually reasonable.

Important note: this is a social handicap, not an official GA handicap. Don't enter a player into a club comp with a social handicap if the comp requires GA registration.

Option 3 — The "off the back" method

Find the player in your group whose handicap you do know, and rank everyone else relative to them. "If Dave's a 14 and Sara typically plays to within 5 shots of Dave, Sara's roughly a 14–18".

It's rough, but social golf isn't a courtroom — it just needs to be fair enough that nobody feels mugged.

Common social-comp handicap mistakes

1. Forgetting the daily adjustment. "Dave's a 12" — but the course slope is 132 and Dave's actually playing off 14 today. Most comps that look unfair are just this.
2. Using last year's number. GA handicaps update with every posted round. A handicap from 18 months ago might be 4 strokes off.
3. Running 100% on a comp that should be 95%. Tiny effect across one round, big effect across a season order of merit.
4. Ignoring stroke index. Players receive strokes on SI 1, 2, 3 — not "any hole they're losing". Strokes are pre-allocated by the card, not the play.
5. Letting players self-handicap mid-round. "I'll just count my best 16 holes" is not Stableford. It's chaos. Lock handicaps before tee time.

Quick-reference

Number	What it is	When you need it
GA Handicap	Your overall index, course-independent	Annual / tracked over 20 rounds
Course Rating	Difficulty for a scratch golfer	Printed on the card
Slope Rating	How much harder for a bogey golfer	Printed on the card
Daily Handicap	Today's playing strokes	Calculated per round, per course
Stroke Index	Difficulty rank of each hole (1–18)	Printed on the card

Bottom line

For social comps in Australia, the four numbers you actually need are: each player's GA handicap (or social-handicap equivalent), the course rating, the slope rating, and the stroke index per hole. Everything else is handled by the maths.

If you'd rather not do the maths by hand, The Nineteenth calculates daily handicaps, strokes per hole, and net scores automatically for every round on every course — free for your first three comps, AUD pricing from $4.99/month after.

For the format your group should be playing, see our Stableford how-to or the matchplay vs strokeplay decision guide.