Why you are five strokes better in the simulator than on the course, and how much of it counts

There is a moment every simulator player knows. You shot an 82 indoors on Thursday and a 91 on the course on Sunday, and the same swing produced both. In forums like GolfWRX players report five to ten strokes of difference, and the higher the handicap, the wider the gap. The simulator does not lie. It just leaves a few things out.

Six reasons the round is easier indoors

1. The lie. Every shot comes off a flat mat. On the course the ball sits in the rough, in a hollow, on a slope, in a divot. A third of your shots on the course are shots from a lie that does not exist indoors.

2. The gimmes. Almost every piece of software concedes putts inside a set distance, often two metres. On the course you miss one in four of those. With ten gimmes a round that is two or three strokes, simply gone.

3. The putting. Even without gimmes, putting on a mat is a different thing: one speed, one slope the software shows you instead of one you have to read. Most venues set the green large and the speed moderate.

4. The weather. No wind, no cold, no wet fairway that stops the ball. The software can simulate wind, but most people switch it off. Cold air alone costs a few metres of carry in winter that you never lose indoors.

5. The penalties. A ball in the water costs one stroke indoors and a drop in the ideal spot. Out of bounds often does not exist at all; the software puts the ball back on the edge. On the course the same shot costs three strokes and ten minutes of searching.

6. The head. Nobody is waiting behind you. No tournament, no bet, no bunker that looks like a hole. The simulator removes the pressure that eats a share of your shots on the course.

The gap, itemised

The six reasons cost different amounts. Split the reported five to ten strokes and you arrive at roughly this. It is an estimate built from the reasons above, not a measurement, but one you can work with:

What is missing	Strokes a round	Why
Gimmes	2 to 3	Ten putts given, and one in four of them would miss
Lies	1 to 2	Rough, slopes and divots do not exist on a mat
Penalties and searching	1 to 2	Out of bounds and water cost more than a stroke outside
Putting without reading	1	A slope that is displayed is not a slope
Weather	0 to 1	Wind and cold air cost carry and direction
Pressure	1	Nobody is waiting, nothing is at stake

What is striking is the distribution: the biggest item is not the swing but the short game and the bookkeeping. So anyone who wants a smaller gap does not turn the software up; they putt and count the way they would outside.

Does the round count for your handicap?

No. The World Handicap System accepts only scores from courses that have a Course Rating and a Slope Rating, that is from a measured real course (Rules of Handicapping, Rule 2.1). A virtual Pebble Beach has none. For handicap purposes a simulator score is a number like any other practice round: interesting, without consequences. What some venues and leagues keep internally as a "simulator handicap" is exactly that: internal.

Which is why even the professionals putt for real. In TGL, the indoor league of Tiger Woods and Rory McIlroy, the long shots are played into a screen and the short ones on a real green of about 490 square metres with twelve hole locations. Because the league knows that a score without real putting is not a score.

How to make the round honest

• Gimmes off, or down to one metre. That alone brings the round two strokes closer to the truth.
• Wind on, moderate. Not because it is realistic, but because you then play balls under the wind again.
• Play from the rough with a penalty where the software offers it: lower ball speed, less spin. GSPro and TrackMan can.
• From the back tees. The simulator round is shorter than it looks, because every drive comes off a perfect mat.
• Write the round down, with the same rules as outside. A score you give yourself helps nobody.

The settings, line by line

Almost every piece of software starts on values that make an evening pleasant. For an honest round you change six of them:

Setting	Often preset to	Honest
Gimme distance	around two metres	off, or one metre at most
Wind	off	on, moderate
Rough lies	no penalty	with a penalty on ball speed and spin
Tees	forward tees	the tees you play outside
Green speed	moderate	as fast as your home course
Mulligans	allowed	none, and the first ball counts

It takes two minutes before the first tee shot and costs you five strokes. Which is the point.

The number that is the same inside and out

There is one score the simulator delivers honestly: the strokes to the green. On every hole, count only how often you swing until the ball is on the putting surface: putts out, gimmes irrelevant. That number measures exactly the part of the game a launch monitor really models, and it can be compared with the course.

Two more figures survive the trip outside: the fairways you hit and the greens in regulation. Someone who hits eight of fourteen fairways indoors hits six or seven outside, not two. What collapses is the short game, and none of those three numbers contains it.

That turns into a practice plan: one round indoors, three numbers written down: strokes to the green, fairways, greens in regulation. The same three outside. The difference tells you whether to work on the swing or on the last twenty metres. For most people it is the second, and that is practised on a green, not on a mat.

What the simulator does better than the course

The round is not the point. The point is the numbers behind it. On the course you know after 18 holes that you shot 91. In the simulator you know that your 7-iron carries 148 metres with a twelve-metre dispersion to the right, that your driver spins at 2900 rpm and that your wedge from 60 metres lands seven metres short on average. Those are three things you can fix. A 91 is not.

So the right answer to "I am better in the simulator" is not to set the simulator harder. It is to use it for what it can do: measure. And the course for what it can do: count. Which venues near you deliver club data is on the map.

And if the score is worse indoors

That happens, and it usually has three causes. First, distance: on a screen four metres in front of you there is no feel for how far anything is, and anyone who normally plays by eye comes up short. Second, putting on a mat, which hardly anyone likes. Third, a ball that rolls less at some venues than it would on a dry fairway in summer.

None of that means you have got worse. It only shows that outside you were living off the course more than you thought. The remedy is the one above: read the numbers the club gives you, and practise the rest where it happens.

Frequently asked questions

Does a simulator round count for my handicap?

No. The World Handicap System accepts only scores from courses with a Course Rating and Slope Rating, and a virtual course has none. Simulator handicaps of individual venues or leagues apply only there.

How much better do people play in a simulator?

Players report five to ten strokes of difference, more the higher the handicap. Gimmes, flat lies, no wind and milder penalties explain most of it.

Which setting makes the round most honest?

Gimmes off, or down to one metre. That alone brings the round about two strokes closer to the course; wind and the back tees do the rest.

Which simulator number also holds on the course?

Strokes to the green, fairways hit and greens in regulation. They measure the part of the game the simulator models correctly. The total score is not one of them, because gimmes, lies and penalties are missing.

Why do I score worse in a simulator than outside?

Usually for three reasons: a screen four metres away gives you no feel for distance, putting on a mat is unfamiliar, and depending on the settings the ball rolls less than on a dry fairway. Playing by the carry numbers on the screen instead of by eye solves most of it.

Sources

• GolfWRX: outside scores vs. indoor simulator scores (Erfahrungsberichte von Spielern, keine Studie)
• USGA / R&A: Rules of Handicapping, Ausgabe 2024 (PDF) (Regel 2.1: ein zählbarer Score wird auf einem Platz mit Course Rating und Slope Rating gespielt)
• Sports Illustrated: TGL changes its indoor playing field for season 2 (Grün von 5'270 Quadratfuss, zwölf Lochpositionen)