The Paroli system is a positive progression betting strategy: instead of increasing your stake after a loss like Martingale, you increase it after a win. The idea is to press your bet size while you’re on a hot streak and pull back to your base stake the moment that streak ends.
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This calculator lets you set a base stake, your typical odds, and a win-streak target (classically 3), then walk through any win/loss sequence to see exactly how your stake and bankroll evolve round by round.
Because Paroli only risks money you’ve already won rather than chasing losses with bigger bets, it’s often described as a lower-risk alternative to negative progression systems β though it comes with its own important limitations.
π How to Use the Paroli Calculator
Set your Base Stake, the Decimal Odds you expect to bet at each round, and your Win Streak Target β the number of consecutive wins after which your stake resets back to base, locking in the sequence’s profit.
The classic Paroli sequence resets after three consecutive wins, though some bettors extend it further at the cost of higher exposure to a single loss.
Then build a round-by-round sequence using the Add Win / Add Loss buttons to simulate any real or hypothetical run, and watch the table update with your stake, result, and running bankroll for every round.
π’ Calculator Fields Explained
Base Stake – The starting bet size you return to after any loss or after completing a full win streak.
Decimal Odds Per Round – The odds you expect to receive on each individual bet in the sequence.
Win Streak Target – The number of consecutive wins after which your stake resets to base, rather than continuing to press upward indefinitely.
Round-by-Round Sequence – The actual sequence of wins and losses you want to simulate, built one round at a time.
π° Understanding the Results
| Result Field | What It Means |
|---|---|
| Net Bankroll Change | Your total profit or loss across the entire simulated sequence |
| Next Stake | What you would bet on the round immediately following the sequence entered |
| Round Table – Stake | The exact amount wagered on that specific round |
| Round Table – Bankroll | Your running cumulative profit or loss after that round |
The stake column is the one to watch most closely, since it shows exactly how quickly your bet size grows during a winning streak.
A single loss at any point in a Paroli progression wipes out only the amount of that round’s stake, never your entire accumulated profit from earlier in the streak.
A single loss on the third round of a streak only costs you that round’s stake, not the profit already locked in from the first two wins. This is the core protective feature that separates Paroli from negative progression systems.
π Calculation Formulas
| Situation | Next Round’s Stake |
|---|---|
| After a win, streak below target | Previous Stake + Previous Round Profit |
| After a win, streak reaches target | Resets to Base Stake |
| After a loss | Resets to Base Stake |
Every stake increase in Paroli uses only money already won in that streak β you are never asked to risk more of your own original bankroll than your base stake.
This compounding-on-wins mechanic is what allows a short hot streak to produce a payout far larger than any single round’s original stake.
π Practical Examples
Example 1 – Perfect three-win streak: A $10 base stake at 2.00 decimal odds, three wins in a row, target of 3. Round 1 stakes $10 and wins $10 profit. Round 2 stakes $20 and wins $20 profit. Round 3 stakes $40 and wins $40 profit, then resets. Total profit: $70 from a $10 base stake.
Example 2 – Win, win, then loss: Same setup, but the third round loses instead of winning. Rounds 1 and 2 still bank $10 and $20 profit. Round 3 loses its $40 stake. Net result: still a $-10 loss overall, wiping out the earlier gains and then some.
A loss on the final round of a streak can erase not just that round’s stake but the entire streak’s accumulated profit, depending on how far the stake had grown.
Example 3 – Immediate loss: A $10 base stake loses on round 1 before any streak forms. The loss is capped at exactly $10 β the base stake β since no progression had built up yet.
The maximum you can lose on any single round is exactly the stake being risked that round, never more. This bounded downside is the main appeal of a positive progression system over Martingale-style approaches.
π‘ Tips & Best Practices
Keep your win streak target realistic for the odds you’re playing β a target of 3 at even-money odds requires roughly a 12.5% chance of hitting the full streak, so plan your expectations accordingly.
Treat each completed streak as a self-contained cycle, resetting your mental accounting back to your base stake once a streak either completes or breaks.
Use this calculator to test different win streak targets against your typical odds before committing to a specific target at the table or sportsbook.
- Set a firm base stake you’re comfortable losing repeatedly, since most sequences will end well before reaching the target
- Avoid retroactively extending a streak target mid-sequence just because you’re “on a roll” β this reintroduces the downside risk the system is designed to avoid
Sticking to a fixed win streak target, decided in advance, is what keeps a Paroli system’s downside genuinely bounded.
Finally, remember that Paroli doesn’t change the underlying house edge or improve your true win probability β it only changes how your winnings are staked across a streak.
β οΈ Common Mistakes to Avoid
Believing Paroli overcomes the house edge
Because Paroli only presses winnings rather than chasing losses, some bettors mistakenly assume it improves their actual odds of winning any given round.
No staking system, including Paroli, changes the underlying probability or house edge of the game itself.
The house edge on each individual bet remains exactly the same regardless of how the stake size is structured across a streak.
Extending the win target after a lucky start
A bettor who hits two straight wins may be tempted to push past their original three-win target, hoping to press even further.
Extending a win streak target mid-sequence after early success is one of the most common ways a bounded system’s risk profile is quietly broken.
Extending the target mid-streak is consistently the costliest deviation bettors make from a disciplined Paroli approach. It turns a system designed around bounded downside back into an open-ended risk.
π― When to Use This Calculator
Use this calculator when you want to plan out a Paroli progression in advance, test how different win streak targets affect your potential upside, or review how a past sequence of results actually played out round by round.
Paroli doesn’t ask you to chase your losses β it asks you to know exactly when to stop pressing your wins.
π Related Calculators
Martingale Calculator, Fibonacci Calculator, Labouchere Calculator, Kelly Criterion Calculator, D’Alembert Calculator
π Glossary
Paroli – A positive progression betting system where stakes increase after wins and reset after a loss or a target win streak.
Positive Progression – Any staking system where bet size increases following wins rather than losses.
Negative Progression – A staking system, like Martingale, where bet size increases following losses.
Win Streak Target – The predetermined number of consecutive wins after which a Paroli stake resets to base.
Base Stake – The starting, minimum bet size in a progression system.
House Edge – The built-in statistical advantage held by the operator on a given bet, unaffected by staking systems.
Bankroll – The total pool of money a bettor has set aside for wagering.
Decimal Odds – An odds format representing total payout per unit staked, including the original stake.
β Frequently Asked Questions
Is Paroli safer than Martingale?
Paroli caps your maximum loss at your base stake on any round where no streak has formed, unlike Martingale, which can require increasingly large stakes after repeated losses.
For example, three straight losses under Martingale can force your fourth stake to be eight times your original bet, while under Paroli each loss simply resets to your original base stake.
Does Paroli guarantee profit over time?
No, it does not change the underlying house edge, and over a large enough sample the expected value remains the same as flat betting at the same average stake.
Paroli simply changes the shape of your results β more frequent small losses at base stake, with occasional larger wins during streaks.
What win streak target should I use?
Three consecutive wins is the traditional target, balancing a realistic chance of completing the streak against a meaningful payout when it does.
A win streak target set too high dramatically lowers the odds of ever reaching it, even at favorable individual-round odds.
For example, at 50% win probability per round, a target of 3 succeeds about 12.5% of the time, while a target of 5 succeeds only about 3%.
What happens if I lose on the last round of my target streak?
You lose that round’s stake, which by that point may be substantially larger than your base stake since it has compounded through previous wins.
Losing on the final round of a streak can erase most or all of that streak’s accumulated profit, depending on how far the stake had grown.
Can Paroli be used at any odds, or only even money?
It works at any odds level, though the calculator above lets you set your own decimal odds so the progression math matches your actual bet type.
Higher odds mean faster stake growth per win but a lower per-round win probability, so the two factors partially offset each other.
βοΈ Legal Disclaimer
This calculator is provided for educational and informational purposes only. No betting system, including Paroli, can overcome the house edge or guarantee profit. Please gamble responsibly and within your means.
