Fibonacci vs Flat Betting

Which roulette betting strategy is right for you? Compare these two popular systems side-by-side.

Fibonacci Strategy

Follow the Fibonacci sequence for bet sizing, moving forward after losses and back after wins.

aggressivemoderatenegative progression

Flat Betting Strategy

Bet the same amount on every spin regardless of wins or losses.

conservativesimpleflat progression

10,000 Simulated Sessions Each: Fibonacci vs Flat Betting

We ran both systems through 10,000 simulated sessions on a European wheel under identical conditions: $1,000 bankroll, stopping at $1,500 (win), $500 (loss), or 500 spins.

Measured over 10,000 sessions	Fibonacci	Flat Betting
Sessions ended in profit	48.9%	25.7%
Average session result	−$135	−$132
Average spins per session	341	490
Average worst drawdown	−$444	−$244
Best single session	$500	$500
Worst single session	−$940	−$500
Hit the table limit	0%	—

In this run, Fibonacci ended more sessions in profit, while Flat Betting lost less on average — a classic trade-off between win frequency and loss size. Neither beat the house edge.

How Fibonacci sessions ended

Losing sessionsWinning sessions

Lost over $800

10.6%

Lost $400–$800

40.3%

Lost $100–$400

0.1%

Lost up to $100

0.1%

Won up to $100

0.1%

Won $100–$400

12%

Won $400–$800

36.8%

Won over $800

How Flat Betting sessions ended

Losing sessionsWinning sessions

Lost over $800

Lost $400–$800

11.9%

Lost $100–$400

42.7%

Lost up to $100

17%

Won up to $100

12.4%

Won $100–$400

15%

Won $400–$800

1.1%

Won over $800

Methodology: fixed-seed runs from our open simulation engine, using the same settings as the strategy guides and interactive simulators — the numbers here match each system's guide page and can be reproduced there. Both systems lose on average because no betting progression changes the house edge; the comparison shows how differently they get there.