Fibonacci betting system: a slower Martingale
The Fibonacci system raises your bet along the sequence 1, 1, 2, 3, 5, 8 after each loss and steps back two places after a win. It grows more slowly than doubling, but it cannot change the house edge.
Reviewed Oct 14, 2026
Answer first
90s| Step | Bet ($5 unit) | Total lost if every bet so far loses |
|---|---|---|
| 1 | $5 | $5 |
| 2 | $5 | $10 |
| 3 | $10 | $20 |
| 4 | $15 | $35 |
| 5 | $25 | $60 |
| 6 | $40 | $100 |
| 7 | $65 | $165 |
| 8 | $105 | $270 |
| 10 | $275 | $715 |
Key numbers
The system in numbers
In short
Key takeaways
- Each bet in the sequence still carries the full house edge.
- A long losing streak runs the bet into the table maximum or your bankroll.
- Small wins are common and big losses are rare, which makes the system feel like it works.
- A flat bet loses the same amount on average and swings far less.
Floor rules
System terms
Know before you sit
- Unit
- Your base bet, such as $5.
- Progression
- A rule that changes the bet after each result.
- Negative progression
- Raising after losses, as Fibonacci and Martingale do.
- Flat betting
- Betting the same amount every time.
Sequence
One short session on red
Step 01
Bet $5
Loses. Next bet $5.
Step 02
Bet $5
Loses. Next bet $10.
Step 03
Bet $10
Loses. Next bet $15.
Step 04
Bet $15
Wins $15. Step back two: next bet $5.
Step 05
Bet $5
Wins. Session is down $5 overall.
Why it fails over time
Each spin is independent. The wheel does not know you lost four times in a row, so the chance of red stays 18 in 38.
The system turns many small wins into rare large losses. Over thousands of spins, the total loss lands close to the house edge times total money bet, whatever staking pattern you use.
The math of a losing run
At an American wheel, an even-money bet loses about 52.6% of the time. Ten losses in a row happen about once every 600 runs, which sounds rare but comes up over a long trip.
When it does, you have lost $715 on a $5 unit and need $445 on the next bet. A win then recovers only part of the loss.
The system also grinds slowly in good runs. Each win steps back two places, so it can take many wins to clear a deep hole.
Fibonacci vs. Martingale after losses ($5 unit)
| Losses in a row | Fibonacci next bet | Martingale next bet |
|---|---|---|
| 3 | $15 | $40 |
| 5 | $40 | $160 |
| 7 | $105 | $640 |
| 10 | $445 | $5,120 |
Martingale doubles each time; Fibonacci follows the sequence.
Common mistakes
- Believing a win is “due”
- Each spin is independent. After five reds, black is no more likely on the next spin.
- Starting with too large a unit
- A large first unit leaves no room for a losing run. Pick a unit that is a small share of your session budget.
- Ignoring the table maximum
- The table limit ends the system on a long streak. Know the maximum before you start.
- Switching systems after losses
- Moving to Martingale or another system does not reset the edge. Every bet still costs the same on average.
- Using it on high-edge bets
- The system cannot help a bad bet. On a 5.26% wheel it loses faster than on a 1.06% banker bet.
What flat betting looks like instead
Flat betting $5 a spin on red for 100 spins puts $500 in action. At a 5.26% edge, the expected loss is about $26, with swings of roughly $50 either way.
Fibonacci over the same 100 spins puts more money in action on average, so its expected loss is higher, while most sessions still end with a small win or small loss.
Keep reading
Related pages
Go play
Where to play in Las Vegas
Tap a resort — each row opens that casino’s White Gambling page (hours, game mix, floor facts). Venues with this game in official counts, sorted high to low.
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Questions before and after you play
A 90-second guide cannot cover every table moment. Tap a group, then a question — answers are short paragraphs, not one-liners.
01How it works
What is the Fibonacci betting system?
A betting progression that raises the stake along 1, 1, 2, 3, 5, 8, 13 after each loss and drops back two steps after each win.
Does the Fibonacci system work?
No system can change the house edge. It changes how wins and losses are spread, not the average result.
Is Fibonacci safer than Martingale?
The bet grows more slowly, so it takes longer to hit table limits. A long losing streak still causes a big loss.
Which games do people use it on?
Even-money bets such as red or black in roulette, banker or player in baccarat, and pass line in craps.
02Risks
Is it illegal to use a betting system?
No. Casinos allow betting systems because they do not change the house edge on any game.
What is a better approach?
Pick a budget, use flat bets, choose games with a low edge and stop when the budget is gone.
03More system questions
What is the reverse Fibonacci?
A positive progression that raises bets after wins and resets after losses. It also cannot beat the house edge.
Can I use Fibonacci online?
Yes, at licensed online casinos. Fast online spins make losing streaks arrive sooner in real time.
How do I stop safely?
Set a session loss limit before you start and quit when you reach it, whatever step of the sequence you are on.
Sources
- Wizard of Odds — Betting systems Not from a registry (Reference source, not an official registry)The gaming industry’s standard reference for casino-game math, by actuary Michael Shackleford. Not an official registry; our calculators compute these numbers independently. · accessed Oct 14, 2026Why progressions fail
- Nevada Gaming Control Board · accessed Oct 14, 2026Approved games and gaming revenue reports
- National Council on Problem Gambling — Help and resources Not from a registry (Reference source, not an official registry) · accessed Oct 14, 2026Free, confidential help: call or text 1-800-GAMBLER
- UNLV Center for Gaming Research Not from a registry (Reference source, not an official registry) · accessed Oct 14, 2026Research library on casino games and gambling