Guide to the Paroli Betting System

Author Image Author: | Last Updated: June 2025

The Paroli betting system is a popular strategy that helps you capitalize upon winning streaks when playing online casino games. You can apply the Paroli strategy to 50/50 bets when playing roulette, blackjack, baccarat, and various other games.

This guide explains how the Paroli system works. You will discover the key pros and cons of this approach, and we’ll also discuss how it compares to alternative systems, such as the Martingale and the D’Alembert.

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What is the Paroli Betting System?

What is the Paroli Betting System?

The Paroli betting system requires you to double your stake (bet size) after you place a winning wager. For example, let’s say you place a successful $10 bet when playing roulette. You would then need to bet $20 on the next spin. If you secure three consecutive wins, you go back to the start and wager $10 again.

How the Paroli System Works

How the Paroli System Works

The Paroli system is a positive progression strategy. It’s designed to capitalize upon short winning streaks. 

This system works best on bets that pay 1:1 (double your money) if you win. Examples include a red/black bet on the roulette wheel, or a wager on the player’s hand when playing baccarat.

If you’d like to pursue this system, you can start by determining your base unit. This can be a small percentage of your bankroll. For example, let’s say you have a $500 budget. You might then decide to make your base unit 2% of that bankroll, which would be $10.

Casino Games

Here’s how the Paroli system works:

  • You start out by betting 1 unit. If you lose, simply bet 1 unit again. Keep going until you win.
  • When you win, double your bet to 2 units on the next round. If that bet wins, double your stake again to 4 units.
  • If you lose at any time, go back to the start and bet 1 unit. Meanwhile, if you win three times in a row, you also go back and bet 1 unit again.

Let’s say you’re playing online roulette, and you decide to bet on “black.” Your base unit is $10. Here’s a hypothetical example of how a session might unfold if you’re pursuing the Paroli betting system:

Bet Result Balance
$10 Loss -$10
$10 Loss -$20
$10 Win -$10
$20 Win $10
$40 Loss -$30
$10 Loss -$40
$10 Win -$30
$20 Loss -$50
$10 Win -$40
$20 Win -$20
$40 Win $20
$10 Loss $10
$10 Loss $0
$10 Loss -$10
$10 Win $0
$20 Win $20
$40 Win $60
$10 Loss $50
$10 Loss $40

In this example, you win 10 bets and lose 10 bets. If you had simply wagered $10 on each spin, you would have ended the session flat. However, you actually ended with a $40 profit, as the Paroli system allowed you to capitalize upon a couple of short winning streaks.

Pros and Cons of the Paroli System

Pros and Cons of the Paroli System

✔️ Pros:

  • The Paroli system doesn’t require a large bankroll. You’ll never need to bet more than 4 units, so this system suits all budgets.
  • Table limits won’t pose a problem. Systems like the Martingale and the Fibonacci often fall apart when they run up against table limits, but that won’t be an issue when you pursue the Paroli system.
  • The Paroli exploits hot streaks. This can be exciting, as your bankroll can quickly increase if you embark upon a short winning streak.
  • It’s not particularly aggressive. The Paroli system suits relatively cautious players, as you go back to betting 1 unit after winning three times in a row. By contrast, the Reverse Martingale is far more aggressive, as it requires you to continually double your stake after each win.
  • The Paroli is simple. It’s easy to follow the Paroli betting system, as it doesn’t require complex mathematical calculations. That sets it apart from more complex systems like the Labouchere and Fibonacci, which can lead to costly miscalculations.

❌ Cons:

  • Some players may find it too cautious. If you win five bets in a row when following the Paroli system, you’ll win 10 units. Meanwhile, if you were following the Reverse Martingale (just keep doubling your bet), you’d earn 31 units.
  • It fails if you don’t enjoy winning streaks. The Paroli system only works if you enjoy some short winning streaks during your session. Casino games are always random, so there are no guarantees of success when you follow this approach. The Paroli cannot overcome the inherent house edge built into casino games either.
  • The Paroli doesn’t chase losses. Systems like the Martingale and Fibonacci appeal to some players, as they aggressively chase down losses, while grinding out small wins. That isn’t the case with the Paroli, so it won’t suit everyone.
  • It only works on certain games. You can’t really use the Paroli betting system when playing slots or video poker, so it has limited use cases.

When to Use the Paroli System

When to Use the Paroli System

You can use the Paroli system whenever you’re placing even money (1:1) bets. Here are some common examples:

Roulette

Roulette

The Paroli strategy is most commonly used on roulette. You can apply it when placing side bets that pay 1:1. There are three options: red/black, odds/even, or high/low.

Casino Gambling

Baccarat

A bet on the player’s hand pays 1:1 if successful, so it’s a great option for anyone following the Paroli system. This bet also has a low house edge (1.24%). A wager on the banker’s hand has a lower house edge (1.06%), but it pays 19:20, so it doesn’t work as well.

craps image

Craps

Bets on pass/don’t pass and come/don’t come pay 1:1. They also carry a low house edge, so they’re ideal for anyone interested in using the Paroli strategy.

Blackjack

Blackjack

You can use Paroli system when playing blackjack, as you’ll be paid out at 1:1 if you win a hand. However, doubling down, splitting cards, and getting paid out at 3:2 when you’re dealt a natural can mess with the system. As such, blackjack isn’t quite as neat as roulette, baccarat, and craps.

Can You Use the Paroli System for Sports Betting?

Can You Use the Paroli System for Sports Betting?

Yes, you can use the Paroli system for sports betting. However, it’s not quite as neat as betting on red/black or odd/even when playing roulette, as it’s pretty rare to find odds of +100 (1:1) when betting on sports.

If you bet on football, basketball, or baseball, the most common markets usually have odds of -110 (91:100). That means you won’t double your money if you win, as you need to risk $110 to generate a $100 profit.

In theory, there’s nothing to stop you from using the Paroli system when betting on sports, but try to follow these principles:

  • Stick to popular markets that have two potential outcomes, such as total points (over/under), point spreads, run lines, puck lines and so on.
  • Try to place bets on markets with odds that are as close to +100 (1:1) as possible. Some sportsbooks offer reduced juice lines of -105 (19:20) on either side of a bet, so they’re attractive.
Paroli vs. Martingale

Paroli vs. Martingale

The Paroli is one of many progression strategies used by online casino players. Others include the D’Alembert, Fibonacci, Labouchere, and Oscar’s Grind. However, the most famous system is the Martingale. This chart explains how the Paroli system compares to the Martingale.

Paroli Martingale
A positive progression strategy, which requires you to increase your bet size after a win. A negative progression strategy,
which requires you to increase your bet size after a loss.
The Paroli system doesn’t chase losses, as you don’t increase your stake after losing. The Martingale doesn’t capitalize on winning streaks,
as you don’t increase your stake after winning.
This system doesn’t require a particularly large bankroll, as you’ll never need to bet more than 4 units. This approach requires a very large bankroll,
as you need to keep doubling your bet size during losing streaks.
Table limits won’t be an issue, as you never need to place particularly large wagers. You need to find a table with very broad limits to try out the Martingale.
This is a relatively cautious approach, which should appeal to players that like minimizing losses and seizing up short winning streaks. This is a very aggressive approach,
which appeals to players that like chasing losses and grinding out small wins.

The Paroli is similar to the Reverse Martingale, but it’s far less aggressive. If you follow the Reverse Martingale, you simply double your stake after each win. You keep on doubling your bet size until you either walk away or surrender all of your previous winnings with a single loss. By contrast, the Paroli is more conservative, as you return to betting 1 unit after winning three times in a row.

Paroli Is About Doubling Down

The Paroli betting system helps you effectively manage your bankroll when playing games like roulette, craps, and baccarat. This positive progression strategy helps you make the most of short winning streaks, and it doesn’t require a large bankroll or high table limits.

If you’d like to try out the Paroli betting system, sign up with one of our favorite online casinos. These trusted sites offer loads of high-quality roulette, baccarat and craps games, so they’re perfect for anyone following the Paroli system.

Author Avatar
About the Author

Webster Lupton is a veteran journalist, editor, author, and gambler. His book, A Place to Play, is a deep-dive on baseball history in North Carolina. Web enjoys camping, birdwatching, and fishing. From North Carolina, he likes betting on college basketball as well as NFL and college football. He’s a lifelong NY Giants fan.

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