Paroli System: The Positive Progression for Roulette Streaks
The reverse Martingale. You raise your bet after a win and reset after a loss, so a losing spin only ever costs the base unit while wins compound during a streak.
- Type: positive progression
- Risk: moderate
- Best bet: even-money
Paroli is a positive progression: you double after each win, usually for three wins, then bank the profit and restart. Because you only ever increase stakes with money you just won, a loss costs you a single base unit - there is no doubling-into-disaster. The trade-off is that you need winning streaks to occur, and over time the house edge still makes the system negative expected value.
Quick facts
| System type | Positive progression (double after a win) |
|---|---|
| Best known use | Riding short winning streaks |
| Typical bet type | Even-money (red/black, odd/even, high/low) |
| Progression style | Geometric on wins, reset on loss |
| Risk level | Moderate |
| Bankroll pressure | Low - losses cost one base unit |
| Table-limit pressure | Low - short, capped progressions |
| Main weakness | Needs streaks; many small losses between wins |
How the system works
Choose a base unit and a streak target (commonly three wins). Bet the base. After a win, let the whole return ride on the next spin. Repeat until you either hit the target - then collect and restart - or lose, which sends you straight back to the base. The key feature is asymmetry: losses are small and constant, wins build on themselves.
Step-by-step example
Base unit $5, three-win target:
| Spin | Bet | Result | Running |
|---|---|---|---|
| 1 | $5 | Win | +$5 |
| 2 | $10 | Win | +$15 |
| 3 | $20 | Win | +$35 → bank, reset |
| 4 | $5 | Loss | +$30 |
Three wins turned $5 of risk into $35. A loss at any point only ever costs the unit on the table at that moment plus restarts the run.
Best bet types for the system
Even-money outsides are ideal because they win close to half the time, so a three-win streak is realistic rather than rare. Higher-paying inside bets win too seldom for the progression to build reliably.
What happens during a losing streak
Almost nothing dramatic - that is the point. Each loss simply resets you to the base unit, so a cold run drains the bankroll slowly at the base-unit rate rather than spiralling. The danger is psychological: small steady losses while you wait for a streak can tempt you to raise the base.
Bankroll and table-limit risk
Both are low. A capped three-win Paroli from a $5 base never bets more than $20, so table limits are irrelevant and bankroll erosion is gentle. The real cost is the slow grind between streaks, set by the house edge.
European vs American roulette impact
Streaks form slightly less often on American wheels (47.4% even-money win rate vs 48.6% on European), and the edge is nearly double. Choose European or French La Partage to keep more of your streaks' value.
Strengths and weaknesses
Strengths
- Losses capped at one base unit
- No table-limit blow-ups
- Wins compound naturally
- Easy to set a clear target
Weaknesses
- Relies on winning streaks
- Many small losses between wins
- One loss erases an unfinished streak
- Still negative expected value
Who the system may suit
Cautious players who want low catastrophic risk and the chance for an occasional bigger win, and who are comfortable banking profit at a fixed target rather than pushing their luck.
Who should avoid it
Players who cannot resist letting a streak run past their target, and those who expect steady profit - Paroli's results are lumpy by design.
Testing advice
Decide your streak target in advance and stick to it. Use the odds calculator to confirm the even-money expected value, and compare Paroli's gentle bankroll curve with Martingale's in the strategy showdown.
Related systems & tools
Frequently Asked Questions
You double after each win for a set number of wins, then reset to the base. Losses only ever cost the small base unit.
Yes for catastrophic risk - it cannot spiral. But it is streak-dependent and still negative-EV. See Martingale.
Three is the classic target. Longer targets pay more but occur far less often.
No. It changes when you risk more, not the odds. Long-term EV stays negative.
Even-money bets, because they win often enough for streaks to form.