A 180 is the best score you can make in one visit: three darts, all in the treble 20. No three darts can score more. Below you will find why that is the ceiling, what "ton 80" and the referee's shout mean, how a 180 compares with a ton, how rare it is (with a table of the odds over a session), and what it does to your average.
Why 180 is the maximum
The Wikipedia article on darts states it plainly: the highest score possible with three darts is 180. The Wikipedia glossary explains how you get there. You hit the treble 20 with all three throws in a single turn.
The arithmetic follows from that:
- Three treble 20s make 180.
- So one treble 20 is worth 60 (180 divided by 3).
- A visit is three darts, so 60 + 60 + 60 is the ceiling.
The glossary also notes that the 180 exists only in x01 games. Wikipedia's nine-dart finish article puts it the same way from another angle: 180 is the maximum score from a shot.
Keep in mind: a 180 needs all three darts in treble 20. If even one dart lands anywhere else, the visit is no longer a 180.
What "ton 80" means
Wikipedia's glossary defines a ton as a score of 100 in a game of x01. Our own reading of the phrase builds on that: take "ton 80" as a ton plus 80, and you get 180, the maximum visit of three darts in treble 20.
| Phrase | How we read it | Score of the visit |
|---|---|---|
| Ton | 100 (glossary definition) | 100 |
| Ton 80 | A ton plus 80 | 180 |
The rest of the ton family and other slang have their own entries in our darts glossary, so this guide stays on the maximum.
The "180!" call
Wikipedia's darts article notes that the referee frequently announces a score of 180 in exuberant style. That line is about the referee's call, so do not read it as a rule for every match or every board.
At home or in a league you do not need a referee to enjoy a 180. If you are keeping score by hand, the steps for writing each visit down, and what to do after a bust, are in how to keep score in darts. If you prefer printing a sheet, there is a darts score sheet on our site.
180 vs a ton vs a checkout
People mix these up, so here is the difference in one table:
| Term | What it is | Where it matters |
|---|---|---|
| Ton | 100, as defined above | Scoring, your stats |
| 180 | The top score for three darts, three treble 20s | Scoring |
| Checkout | The visit that finishes a leg | Finishing |
A 180 is about how many points you add. A checkout is about how you finish. They answer different questions. The finishing side is covered in the 170 checkout guide and on our checkout chart.
How rare is a 180?
It depends on who is throwing. Darts News, in a piece quoting the PDC's stats expert, says that if a professional throws three darts at treble 20, he will score 180 about once in every 15 attempts. The same article calls it a 1 in 15 chance per visit.
Two limits matter:
- That figure describes professionals. Our sources give no number for club or casual players, so do not assume your own rate.
- It is a chance per visit, not a schedule. Fifteen visits do not guarantee one 180.
What 1 in 15 means over a session
To make the pro figure concrete, here is our own arithmetic. It assumes the 1 in 15 chance holds for every visit and that each visit is independent of the last. Real players are not that tidy, so treat it as an illustration, not a forecast.
| Visits at treble 20 | Chance of at least one 180 (our calculation) |
|---|---|
| 5 | About 29% |
| 10 | About 50% |
| 15 | About 64% |
| 30 | About 87% |
How we got it: the chance of missing the 180 in one visit is 14 in 15. Raise 14/15 to the power of the number of visits, then subtract the result from 100%. For 15 visits, (14/15) to the power of 15 is about 0.36, so the chance of at least one 180 is about 64%.
The useful lesson: even at the professional rate quoted by Darts News, a pro has roughly a one in three chance of going 15 visits without a single maximum.
A worked example: what a 180 does to a leg
Take a game of 501.
| Visit | Score | Remaining |
|---|---|---|
| Start | 501 | |
| 1 | 180 | 321 |
| 2 | 180 | 141 |
Two 180s leave 141 after six darts. Three of them would make 540, which is more than 501, so a third 180 cannot happen in a leg of 501. Wikipedia's nine-dart finish article sums up the limit: 180 is the maximum from a shot, and nine throws are the minimum needed to win. Our 170 checkout guide shows how the last visit of a leg is built.
How a 180 feeds your average
Wikipedia's glossary describes the 3-dart average as the average score achieved every three darts thrown. A 180 is the top of that scale. It works out to 60 points per dart for that visit, and no other visit can add more to your average.
Here is how a few visit scores compare per dart (simple division):
| Visit score | Points per dart |
|---|---|
| 180 | 60 |
| 140 | About 46.7 |
| 100 | About 33.3 |
| 60 | 20 |
The formula and longer examples are in how to calculate your 3-dart average, so we will not repeat them here. Our suggestion: judge your average over many legs rather than by the visits that stand out. For how to read your numbers over time, see what is a good darts average.
Scoring your 180s in the app
Darts Counter: Scoreboard is an Android app that scores X01 for you with start scores from 301 to 901. It shows your 3-dart average, the number of darts thrown and an overview of your last three throws. An undo function corrects recent entries with a single tap.
We have not confirmed that the app keeps a dedicated count of your 180s, so check the statistics screen on your own device rather than relying on this guide. There is no iPhone version. More about the app is on the Darts Counter page, and the basics of the game are on darts explained.
Common mistakes
- Calling a 180 a checkout. It is a scoring visit. Finishing a leg is a separate question.
- Counting three darts as a 180 when any dart misses treble 20. The glossary definition is three darts in treble 20, nothing else.
- Believing three 180s fit in 501. They add up to 540, more than 501.
- Using the pro rate for yourself. The 1 in 15 figure from Darts News is for professionals.
- Expecting one in every 15 visits. Even at that rate, our table shows about a one in three chance of none in 15 visits.
Sources
All pages accessed on October 22, 2026.
- Wikipedia, Glossary of darts: the definitions of 180 (treble 20 with all three throws, x01 only), of a ton (100) and of the 3-dart average.
- Wikipedia, Darts: that 180 is the highest three-dart score and the line that the referee frequently announces it in exuberant style.
- Darts News, PDC's stats expert takes a look at the numbers behind the greatest leg of all time: the rate of about one 180 in 15 visits for a professional.
- Wikipedia, Nine-dart finish: that 180 is the maximum score from a shot and nine throws are the minimum to win.
