Wheel
Table
Tap a number or an outside bet to place the chip you picked. Pays 35 to 1 on a single number, 2 to 1 on dozens and columns, evens on red, black, odd, even, 1-18 and 19-36. Play money only.
- Maths reviewed by Josh Miller
- Tested by Diana Westfield
This Fibonacci betting calculator runs the system for you, thousands of spins at a time, with your own bankroll, base bet and table limit. The Fibonacci system bets in the sequence 1, 1, 2, 3, 5, 8, 13 units: one step on after every loss, two steps back after every win. It feels gentler than doubling, and in the short run it often is. Press run and the CasinoCalcs simulator shows how many sessions finish ahead, how deep the worst one went and what the average result was.
Fibonacci betting calculator: how the sequence plays out
With a £5 unit on red, here’s a bad run followed by a recovery:
| Spin | Bet | Result | Running total |
|---|---|---|---|
| 1 | £5 | Lose | −£5 |
| 2 | £5 | Lose | −£10 |
| 3 | £10 | Lose | −£20 |
| 4 | £15 | Lose | −£35 |
| 5 | £25 | Win | −£10 |
| 6 | £10 | Win | £0 |
Two wins after four losses and you’re level, which is why the system feels like it works. The problem is the long run. Eight losses in a row, about once every 207 sequences on red, means you’ve lost £270 and the next bet is £170. Twelve in a row and the next bet would be £1,165, often above the table limit.
What the simulator shows
Set the bankroll to £500 with a £5 base and run 1,000 sessions of 200 spins. Most sessions end close to level or a little up, a minority end deep down, and the average comes out at roughly the house edge times everything staked. That last number is the only one that matters over time, and no betting system moves it. On a single-zero wheel it’s 2.7%; switch the wheel to double zero and it nearly doubles.
The martingale calculator shows the more aggressive doubling system, the Labouchere calculator a line-based one, and the full betting systems simulator compares them all side by side.
A system decides how you lose, not whether. BeGambleAware.org has free support if roulette stops being fun.