Pari-mutuel betting: how it works, from ticket to payout
Every bet type on a race has its own pool: win, one for place, one for show, one each for the exacta, trifecta and so on. When a bettor buys a $2 win ticket on the 4 horse, that $2 joins the win pool and is recorded against the 4. Nothing about the price is fixed at that moment.
When the field leaves the gate, the pools close. After the stewards declare the result official, the tote system subtracts the takeout, rounds the result down through breakage and divides what is left among the winning tickets. That is how it works on every American track, from a county-fair harness oval to the largest thoroughbred meeting.
The French impresario Joseph Oller devised the system in 1867, and the name comes from the French for “betting among ourselves”. The heavy arithmetic later led to the totalisator machine, first installed in New Zealand in 1913. American tracks adopted it from 1927, and Illinois tracks such as Arlington followed in 1932.
Because the operator only keeps a percentage, pari-mutuel betting gives the track no stake in which horse wins. That neutrality is why state legislatures accepted it decades before they allowed casino games, and why the racino model grew out of tracks that already held a pari-mutuel license and simply added machines.
Takeout: the cut that leaves every pool first
Takeout is the single biggest cost a horseplayer faces. It is taken from the gross pool before any winner is paid, so a 20% rate means only 80 cents of every dollar wagered comes back to bettors as a group. Part of it pays purses, part goes to the state and the rest covers the track’s costs.
Rates differ by state, breed and bet type. Straight bets usually carry the lowest takeout, while exotics with many combinations carry more. Some tracks cut the rate on selected bets to attract volume; Kentucky Downs, for example, reported lowering its pick 3, pick 4 and pick 5 takeout to 15% while raising its straight-bet minimum.
| Jurisdiction or track | Win, place, show | Exacta / doubles | Trifecta and bigger | Source |
|---|---|---|---|---|
| The Red Mile, Kentucky (harness, 2025 program) | 18% | 20% exacta, 18% daily double | 24% trifecta, superfecta, pick 3 | Track program |
| The Red Mile pick 4 and pick 5 | – | – | 12% | Track program |
| Keeneland, Kentucky (thoroughbred, track-published rates) | 16% (show 10% on track) | 19.5% exacta | 22% trifecta, superfecta, pick 3, pick 4, pick 6 | Track wagering page |
| California thoroughbred | 15.43% | 20.68% exotics | 20.68% exotics | Assembly analysis (2010) |
The table shows why the same $2 can return different amounts in different states. A win pool with 15.43% takeout returns about 84.6 cents per dollar to bettors, while one with 18% returns 82 cents. On a single race the gap is small, but a regular player who bets every race of a meet feels it over hundreds of tickets.
New York’s history shows how political the number is. A state Inspector General report described a temporary one-point takeout increase on most wagers at New York Racing Association tracks that had been due to expire in September 2010, and found the association kept charging the higher rate afterwards, an error that had to be repaid to bettors.
Breakage, minus pools and the $2.10 floor
After takeout, the net pool divided by the winning money rarely produces a round number. Breakage rounds each payout down, usually to the nearest ten cents per dollar, and the leftover cents stay with the track and the state. California is one of the jurisdictions known for ten-cent breakage, and most American tracks follow the same step.
The opposite problem arises when a heavy favorite wins a pool that was mostly bet on it. If the net pool cannot cover the winning stakes plus the legal minimum profit, the result is a minus pool. The track then makes up the shortfall, because winning tickets in most states must return at least $2.10 for every $2 wagered.
Minus pools show up most often in show betting. Big bettors sometimes put large sums on an odds-on favorite to show, expecting the 5% return that the $2.10 rule seems to promise. When that favorite runs out of the money, the show pool pays unusually generous prices on the three horses that did finish in the top three.
Reading horse racing odds on the tote board
The tote board, at the track and on simulcast screens, shows the current odds, the pool totals and the time to post. The first lesson in how to read horse racing odds is that they show profit to stake: 3-1 means $3 profit for every $1, 9-5 means $9 for every $5, and 1-1 is called even money.
Here is how to read horse racing odds from the pools. Take the win pool, subtract takeout, divide by the amount bet on one horse and subtract one. A horse with $8,000 of a $50,000 win pool, at 16% takeout, has $42,000 divided by $8,000, or 5.25 per dollar. Subtracting the returned stake gives odds of 4.25 to 1.
| Horse | Win money | Share of pool | Net pool ÷ win money | Odds shown |
|---|---|---|---|---|
| 1 | $15,000 | 30% | 2.80 | 9-5 |
| 2 | $4,000 | 8% | 10.50 | 9-1 |
| 3 | $11,000 | 22% | 3.82 | 5-2 |
| 4 | $8,000 | 16% | 5.25 | 4-1 |
| 5 | $12,000 | 24% | 3.50 | 5-2 |
In the example above the total win pool is $50,000 and takeout is 16%, leaving $42,000. Each horse’s displayed odds are rounded down to the nearest standard fraction, which is why the 4 horse at 4.25 to 1 appears as 4-1 and the 3 horse, at 2.82 to 1, shows as 5-2 rather than as an exact decimal.
A horse’s share of the pool also hints at what the crowd believes. Ignoring takeout, 30% of the money on the 1 horse implies the public gives it about a 30% chance. Comparing that implied chance with your own estimate is the basis of value betting, the only way to beat a pool that charges takeout on every dollar.
Morning line versus live odds
The morning line is printed in the program next to each horse. It is a forecast by the track’s handicapper of how the public will bet, not a price anyone can take. It sets expectations only, and a horse listed at 6-1 can easily go off at 3-1 once money arrives.
Live odds start when betting opens and refresh every few seconds. Large late bets from account wagering and from simulcast outlets can reach the pools in the final minute, so prices often shift after the field is loaded. Experienced bettors watch the last two or three board flashes rather than relying on an early look.
Win, place and show payouts worked out
A winning $2 ticket on the 4 horse from the table returns the stake plus profit. The profit per dollar is 4.25, which breakage cuts to 4.20. The ticket therefore pays $2 plus $8.40, a total of $10.40. Breakage on that horse alone keeps five cents for each of the 8,000 winning dollars, which is $400.
Place pays on a first or second finish, so two groups of tickets share the pool. Say the place pool holds $20,000, takeout of 16% leaves $16,800, and $4,000 was bet on the 4 and $6,000 on the 7. The $10,000 bet on those two horses is returned first, leaving $6,800 of profit split into halves.
Each half is $3,400. For the 4 horse that is 85 cents profit per dollar, so a $2 place ticket pays $3.70. For the 7 horse it is 56.7 cents, which breakage cuts to 50 cents, so a $2 ticket pays $3.00. Show works the same way, except that the profit is split three ways among the first three finishers.
Exotic bets: exacta, trifecta, superfecta
Exotic wagers ask for the exact order of finishers. An exacta names first and second, a trifecta the first three and a superfecta the first four. Each has its own pool and its own takeout, generally higher than win, place and show; The Red Mile’s 2025 program lists 20% for the exacta and 24% for both the trifecta and superfecta.
Payouts follow the same rule as straight bets. With $30,000 in the exacta pool and 20% takeout, $24,000 is left. If $1,200 was bet on the 4-7 finish, each $1 on that combination returns $20, so a $2 exacta ticket pays $40. A box covers every order of the chosen horses and costs one ticket per combination.
Because the number of combinations multiplies quickly, tracks sell superfectas in small units, often 10 or 20 cents. A 20-cent superfecta box with five horses has 120 combinations and costs $24. If the winning combination pays $500 for a $1 unit, the 20-cent bettor collects one fifth of that, or $100.
Daily doubles, pick bets and carryovers
Multi-race bets link the winners of consecutive races. A double asks for the winners of two races, a pick 3 three races and so on up to the pick 6. The cost of a ticket is the number of horses picked in each leg multiplied together, then multiplied by the base unit, which is why pick tickets grow expensive fast.
When nobody picks every winner, the rules for that bet decide what happens to the pool. The Red Mile’s 2025 program carries its pick 4 and pick 5 pools over in full to the next card, with a 25% consolation payout, and charges 12% takeout on them. A large carryover adds money nobody paid that day.
Simulcast and commingled pools at racinos
Most racinos show races from dozens of other tracks daily in a simulcast area. A bet placed there on a race in another state is not a side bet with the racino. It is transmitted to the host track and commingled with that track’s pools, so everyone receives the same price whether they bet at home or 800 miles away.
The host track’s takeout applies to commingled money, and the betting site receives a share under a simulcast contract. That arrangement lets a racino with only a short live meet, such as a summer harness season, keep its betting windows open all year. The horse racing schedule guide lists the live meets at each racino.
The tote board simulator below and odds calculators
The tote board simulator below runs one invented race. You pick a horse, choose a stake and watch simulated money from other bettors land in the pool. The odds move each time the board refreshes, and when betting closes the tool deducts takeout, applies breakage and shows the final payout beside the price on display when you bet.
An online horse racing odds calculator does the reverse sum: enter odds such as 7-2 and a stake, and it returns the expected payout. That is handy for a check, but it cannot predict the final price, which is the lesson of the simulator. Real horse racing odds stay provisional until the pools close and the result is official.
How racino money changes pari-mutuel betting purses
Purses are funded partly by takeout and partly, at racinos, by a share of slot or video lottery revenue set in state law. That second stream often outweighs the first. It lets a track offer larger purses than its pari-mutuel betting handle could support on its own, which attracts bigger fields and, in turn, more betting interest.
Larger, fuller fields matter to bettors because a race with eight or more runners usually produces a bigger, more competitive pool than one with five. The racino revenue guide breaks down how much gaming money each state routes to purses and breed funds, while the historical horse racing guide explains machines that run on pooled wagering.
Pari-mutuel betting compared with fixed odds
At a sportsbook the price is fixed when the bet is struck and the house carries risk. With pari-mutuel betting the price floats and the operator’s income comes from takeout, whatever the result. New Jersey has approved fixed-odds horse racing wagers, but that is how it works only at the margins; the pooled model still handles almost all American racing.
The pooled model, and how it works for the operator, also explains why racinos can sit alongside casinos without the track worrying about who wins a race. To find a track with a live meet or a simulcast room nearby, use the racinos near me map, and keep any betting within limits you set before arriving.