Index → Betting systems
Roulette betting strategies, one at a time
Every roulette betting strategy is a rule for choosing the next stake based on what just happened. That is all. The wheel pays the same odds whether your £5 was a first bet or the eighth step of a sequence, and it keeps 2.70% of every pound either way. What the systems change is the shape of a session: how often you win, how big the swings are, and how a bad run ends. Here is each one on those terms.
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Flat betting
Same stake every spin. Boring, and the only system where the expected loss is exactly what the formula says and nothing more. £5 on red for 100 spins: £500 through the table, about £13.50 expected loss, finishing ahead about 36% of the time. Nothing to go wrong. The right default.
Martingale
Double after every loss, return to base after a win. Each winning spin recovers all previous losses plus one base unit. The problem is the losing streak. From a £5 base, seven straight losses need a £640 bet to continue, and most tables and bankrolls will not allow it. A streak of seven on red happens about 0.94% of the time per starting spin, which over an evening of 200 spins is not rare. When it hits, the sequence loses £635 against the £5 it was trying to win.
| Losses in a row | Next stake | Staked so far | Chance of the streak |
|---|---|---|---|
| 3 | £40 | £35 | 13.5% |
| 5 | £160 | £155 | 3.56% |
| 7 | £640 | £635 | 0.94% |
| 9 | £2,560 | £2,555 | 0.25% |
Lots of small wins, one catastrophic loss. The average is still minus 2.70%.
Fibonacci
Stakes follow 1, 1, 2, 3, 5, 8, 13… After a loss move one step up; after a win move two steps back. Gentler than Martingale, so the bankroll lasts longer, but a long losing run still climbs: ten steps from a £5 base is a £445 bet. It finishes sessions ahead more often than flat betting, around 70% in simulations, because the losses are concentrated into fewer, larger sessions. The average remains 2.70% of turnover.
D'Alembert
Add one unit after a loss, subtract one after a win. The slowest escalation of the progressive systems and the easiest to keep inside a table limit. It leans on the idea that wins and losses will even out, which they do not in any fixed window. Mild swings, mild results, same edge.
Labouchere
Write a sequence, say 1-2-3-2-1. Stake the sum of the first and last numbers. Win, cross both off; lose, add the stake to the end. Clearing the line wins the total of the original numbers. It feels structured and it is, but a losing run makes the line longer and the stakes larger, exactly like the other progressions. Harder to track by hand than it looks.
Paroli
The reverse: double after a win, up to three wins, then back to base. Losses are always one unit; the hoped-for result is a run of three. At £5 base over 100 spins the expected loss is about £23, more than flat betting because the stake is higher on the spins that follow a win, and the session finishes ahead around 38% of the time. Its merit is that it cannot blow up: the worst spin is a base unit.
What none of them do
Change the probability of red. Change the 35:1 on a number. Change the 2.70%. Every system's long-run result is minus 2.70% of total stakes. Pick one for the shape of session you want, with a bankroll that covers its worst case, and treat it as entertainment with a known price.
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Asked and answered
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Which roulette betting strategy is best?
For keeping losses predictable, flat betting. For a session with a shot at a bigger win, Paroli. For avoiding ruin, anything that does not double after losses. None improves your odds; they differ in how the money swings.
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Does Martingale work on roulette?
It works until a losing streak meets the table limit or your bankroll, and then it loses more in one sequence than it won in all the others combined. On a £5 base with a £500 limit, that streak is seven losses, which happens about once in a hundred spins of red.