Free Roulette Systems
Strategy Lab & Tools
Systems library

Roulette systems explained with real math, not myths.

Martingale, Fibonacci, Labouchere, D’Alembert, Oscar’s Grind – fully broken down.

This systems library is a collection of the most common roulette strategies, analyzed from the ground up. For each system we show how it works, how stakes change, what happens during long streaks, and why none of them can overcome the house edge in the long run.

Use these pages together with the tools & calculators and the responsible gambling guide to evaluate systems calmly, with numbers instead of optimism.

📉 Negative progressions 📈 Positive progressions 📊 Volatility & bankroll analysis

Core roulette systems

Martingale

The famous “double after every loss” system. Designed for even-money bets, Martingale tries to recover all previous losses with a single win – at the cost of explosive stake growth.

  • Type
    Aggressive negative progression
  • Volatility
    Very high – stakes can skyrocket in a few losses.
  • Key risk
    Table limits and finite bankroll collide with long losing streaks.
View Martingale guide

Fibonacci

A sequence-based system for even-money bets. Stakes follow the famous Fibonacci sequence after losses and step back down after wins, creating a gentler but still escalating pattern.

  • Type
    Structured negative progression
  • Volatility
    High, but slower growth than Martingale for the same number of losses.
  • Key risk
    Long loss runs still push stakes and exposure far higher than flat betting.
View Fibonacci guide

Labouchere

Also known as the “cancellation” system, Labouchere uses a line of numbers to control stakes. Wins cross numbers off; losses extend the line – making it highly sensitive to streaks.

  • Type
    Flexible negative progression
  • Volatility
    Can ramp up quickly if early losses stretch the line.
  • Key risk
    Complex lines can mask how deep you’re going until exposure is large.
View Labouchere guide

“Gentler” systems & grind strategies

D’Alembert

A simple “one up after a loss, one down after a win” system for even-money bets. Stakes grow in single-unit steps rather than doubling, making it feel calmer than Martingale – but streaks still bite.

  • Type
    Mild negative progression
  • Volatility
    Higher than flat betting, lower than fast progressions.
  • Best use
    As a thought experiment in how small bet adjustments shape swings.
View D’Alembert guide

Oscar’s Grind

A positive progression that aims for small, steady profits per “series”. Bets stay flat during losses and increase after wins, targeting a modest gain before resetting.

  • Type
    Positive progression
  • Volatility
    Stakes grow slowly; risk shows up when series drag on.
  • Perceived appeal
    Many series end with a small win, which can feel like “grinding an edge”.
View Oscar’s Grind guide

Compare systems by volatility & risk

Rough volatility ladder (even-money bets)

System Progression type Volatility Main risk
Martingale Double after loss Very high Huge bet sizes after losing streaks; table limits & bankroll blow-ups.
Labouchere Line-based negative progression High Line expansion during bad runs creates large exposure.
Fibonacci Sequence negative progression Moderate–high Bet sizes still grow quickly during long loss streaks.
D’Alembert +1 after loss, −1 after win Moderate Extended losing runs gradually push stakes up and erode bankroll.
Oscar’s Grind Positive progression, small goal per series Moderate Drawn-out series and psychological temptation to “finish the grind”.

All of these systems share the same underlying reality: roulette’s house edge does not change. What changes is the pattern of wins and losses and the size of stakes when things go wrong.

Tools to analyze systems with real numbers

Plug systems into the FreeRouletteSystems.com lab

  • Probability Calculator
    Get exact win/lose probabilities for the bets your system uses (for example, even-money bets on European vs American wheels).
  • EV Calculator
    Translate those probabilities into expected value per spin and per session for your chosen stake and number of spins.
  • Losing Streak Calculator
    See how often the kind of losing runs that break systems are likely to occur in practice, and what they mean for bankroll requirements.

A system that looks comfortable on paper can feel very different once you’ve seen how frequently long streaks happen and how much they cost at your chosen stakes.

Remember: systems don’t change house edge

Every system in this library is built on the same core reality explained in How roulette works: the wheel has a built-in house advantage. No pattern of bet sizing alters the underlying odds.

If you choose to experiment with any of these systems using real money, keep stakes small, set strict limits, and read the responsible gambling guide first. The goal here is understanding – not finding a shortcut that doesn’t exist.