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Horse racing isn’t bet like football. There’s no sportsbook setting a line or locking in odds. Instead, every bettor contributes to a shared pool, and payouts depend on how that pool is distributed.
That’s the foundation of parimutuel betting: a system where bettors compete against each other, not the house, and odds shift continuously until the race begins.
Editorial Note
This guide explains how parimutuel betting works in horse racing, including betting pools, takeout, odds movement, and payout calculations. It is intended for educational purposes to help readers understand how horse racing wagering systems operate and does not guarantee betting success or outcomes.
Quick Answer
Parimutuel betting is a wagering system where all bets are placed into a shared pool, the racetrack deducts a takeout, and the remaining money is divided among winning bettors. Unlike sportsbook betting, odds are determined by how money is distributed in the pool and continue changing until betting closes at post time.
Definition: Parimutuel Betting
Parimutuel betting is a wagering system where all bets are placed into a shared pool and payouts are determined after the track deducts a percentage called the takeout.
Core Market Principles
- All wagers go into shared pools.
- Bettors compete against each other.
- The track removes a takeout.
- Payouts depend on pool distribution.
What Is Parimutuel Betting in Horse Racing?
Parimutuel betting works by pooling all wagers together. After the race, the track deducts its percentage, and the remaining funds are distributed among winning tickets.
Unlike sportsbooks, odds are not fixed. They are shaped by how money flows into the pool. The more bettors back a horse, the lower its payout.
Key Insight
Concept:
All bets enter a shared pool.
Why it matters:
Payouts depend on how money is distributed.
How Do Parimutuel Betting Pools Work?
Every parimutuel wager is placed into a dedicated betting pool based on the type of bet you make. Win, place, show, exacta, trifecta, and other wager types each have their own independent pool, meaning payouts are calculated separately for every market.
Once betting closes at post time, the racetrack deducts its takeout from each pool and distributes the remaining money among the winning tickets. Because payouts depend entirely on how bettors allocated their money, the final odds are not locked until wagering officially ends.
Example
Total Pool:
$100,000
After Takeout:
$85,000 distributed to winners
| Pool Size | Payout Behavior |
|---|---|
| $20,000 | High volatility |
| $100,000 | Moderate stability |
| $500,000+ | More stable payouts |
Why Do Odds Change Before Race Time?
Unlike fixed-odds sportsbooks, parimutuel markets remain fluid until the race begins. Every new wager changes how money is distributed across the betting pool, causing the displayed odds to rise or fall throughout the betting period.
Large wagers placed shortly before post time can significantly alter the final payout, especially in smaller pools. This is why the odds you see when placing your bet may differ from the official closing odds shown as the race gets underway.
Key Insight
Concept:
Odds reflect pool distribution.
Why it matters:
Late money can change payouts significantly.
Types of Bets in Parimutuel Systems
All horse racing wagers operate within their own pools.
For a deeper breakdown of each wager type, including win, place, show, and exotic formats, see this horse racing wagers explained guide, and learn how advanced combinations work in this horse racing multiple wagering system guide.
| Bet | Requirement |
|---|---|
| Win | Finish 1st |
| Place | Top 2 |
| Show | Top 3 |
Exotic Bets
- Exacta – pick top 2 in order
- Trifecta – pick top 3
- Superfecta – pick top 4
Parimutuel vs Sportsbook Betting
Although both systems allow you to wager on sporting events, they determine odds and payouts in fundamentally different ways. Understanding these differences helps explain why horse racing odds continue to change until post time, while sportsbook prices are typically locked in the moment your bet is accepted.
In a sportsbook, you’re betting against the bookmaker at fixed odds. In a parimutuel system, you’re effectively competing against every other bettor in the pool, and your final payout depends on how the betting money is distributed when wagering closes.
| Feature | Sportsbook | Parimutuel |
|---|---|---|
| Odds Source | Bookmaker | Betting pool |
| Price Lock | At bet time | At post time |
| Opponent | House | Other bettors |
Online Racebooks Explained
Most horse racing bettors no longer need to visit a racetrack to participate in parimutuel wagering. Online racebooks provide access to the same betting pools used at participating tracks, allowing you to place wagers from virtually anywhere while following races in real time.
When you submit a wager through a licensed racebook, your bet is combined with all other wagers in the appropriate betting pool. The odds continue to fluctuate as additional money enters the market, and your final payout is determined once betting closes at post time—not when you place your bet.
Why Bettors Use Online Racebooks
- ✔ Access official parimutuel betting pools remotely.
- ✔ Watch odds update in real time before post time.
- ✔ Bet across multiple racetracks from a single account.
- ✔ Wager on both traditional and exotic horse racing markets.
See Parimutuel Betting Live
Watch odds shift in real time and follow betting pools using the MyBookie Racebook.
Explore the RacebookFAQ
What is parimutuel betting?
Parimutuel betting is a wagering system where all bets are placed into a shared pool. After the racetrack deducts its takeout, the remaining money is divided among the winning tickets based on the final pool distribution.
How are parimutuel odds determined?
Parimutuel odds are determined by how much money bettors place on each horse. As wagers enter the pool, the odds adjust continuously until betting closes at post time.
Why do horse racing odds change before the race starts?
Odds change because every new wager alters the distribution of money within the betting pool. Large bets placed shortly before post time can significantly affect the final payout.
What is the takeout in parimutuel betting?
The takeout is the percentage deducted from each betting pool by the racetrack or racebook before payouts are calculated. The remaining funds are then distributed among the winning bettors.
What’s the difference between parimutuel betting and sportsbook betting?
In sportsbook betting, you wager against the bookmaker at fixed odds that are locked in when your bet is accepted. In parimutuel betting, you wager against other bettors, and your final payout depends on the odds at post time.
Can you bet horse racing online?
Yes. Licensed online racebooks allow you to place parimutuel wagers that enter the same betting pools used at participating racetracks, giving you access to live odds and official payouts.
Summary
- Parimutuel betting uses shared pools
- Odds are crowd-driven
- Payouts depend on distribution
- Odds change until post time
Final Thoughts
Parimutuel betting creates a dynamic, crowd-driven market where payouts are never fixed and odds reflect real-time betting behavior.
Understanding pool mechanics, takeout, and betting distribution gives you a clearer edge when navigating horse racing markets.
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About the Author
Since 2008, D.S. Williamson has written about sports and sports handicapping. His philosophy is value-based, meaning stats and other handicapping factors are only worth something in comparison to wagering odds. He believes money management and making value-based wagers is the single more important factor that distinguishes successful sports bettors from non-successful sports bettors.
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