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Spinbetter
Updated Fact-checked 4 min read
Daniel Whitmore
Senior Editor 9+ yrs
The simulator runs a calibrated European-wheel RNG model — the same code we use internally to audit every strategy review on this site.
- Published
- Updated
- Fact-checked
Roulette strategy simulator
Test any betting pattern on a calibrated RNG model of the European wheel. Up to 1,000 spins per run, 0.1–500 unit chip values, three progression modes (flat / double-after-loss / double-after-win), and a per-round payout log. Zero risk, instant feedback — the system runs in your browser.
Strategy lab · Free, no signupUp to 1,000 spinsThree progression modesRNG calibrated to European wheel
Try the strategy · Martingale
Bet a fixed base on an even-money outside chance. Double after every loss, reset to the base after every win. One win recovers the prior streak plus a single base unit of profit — until you hit the table cap or your bankroll.
Base bet
A mathematical model — not a guarantee. Long enough runs always reveal the house edge.
Strategy-specific simulators
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Martingale simulator
Double after every loss. The most famous progressive system — and the easiest to watch break.
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D'Alembert simulator
+1 unit after a loss, -1 after a win. The gentlest of the progressions; lowest bankroll risk.
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Labouchere simulator
Cross-out sequence. Set a profit target, the system handles the bet sizing.
Instructions
The simulator exists for one purpose: to let you test and stress any roulette strategy or betting pattern in your browser, no signup, no risk. Under the hood it runs a JavaScript RNG calibrated to the European wheel's exact distribution; the math is identical to a real roulette table, with the convenience that you can run 1,000 spins in seconds instead of two hours at the croupier.
Using the simulator — step by step
Five inputs, one button. Here's what each field does:
- 1
Place your bets
Drop chips on the betting layout using values from 0.1 to 500 units. The 'Total Bet' indicator at the top sums every chip on the felt. Use 'UNDO' to remove the last chip, 'CLEAR' to wipe the layout.
- 2
Set the spin count
Pick a number between 10 and 1,000. For meaningful conclusions about a strategy, run at least 1,000 spins — anything shorter is dominated by variance.
- 3
Set the starting balance
Between 100 and 100,000 units. Match the simulator bankroll to the real bankroll you'd bring to the table, otherwise the break points won't be representative.
- 4
Pick a progression mode
Default = flat bets, same stake every spin. Double after loss = classic Martingale shape. Double after win = paroli / reverse Martingale. The progression decides what happens to your stake after each outcome.
- 5
Hit Start
The simulator walks the system spin by spin. The output table logs Round, winning Number, Status (won/lost), Bet, Payout and running Balance — so you can audit any moment of the run.
Output columns explained
Every row in the results table answers one question — here's the column reference.
| Column | What it tells you |
|---|---|
| Round | Sequential spin number — 1, 2, 3 … N. |
| Number | Winning pocket the RNG drew this round. |
| Status | Whether your active bets won or lost this spin. |
| Bet | Total chip value on the felt at the start of the round (after any progression adjustment). |
| Payout | Net change to your balance from this round — positive on a win, negative on a loss. |
| Balance | Running bankroll after the round. The simulator stops if it drops to zero. |
FAQ
Is the RNG fair?
Yes — it uses a uniform random distribution over 37 pockets, calibrated to the European wheel's exact probability for each pocket. The output is mathematically indistinguishable from a fair physical wheel over enough spins.
Can I save a run for later analysis?
Not yet — the simulator state lives in the current browser session. If you want to keep the trace, screenshot the output table at the end of the run. Roadmap includes CSV export.
Why does my balance sometimes go negative briefly?
It doesn't — the simulator halts the moment the balance drops to zero. If you see a small negative number on the last row, the doubling progression demanded more than your remaining bankroll for the next bet, and the system stopped at the bankrupt round.
Does this simulator replace real-money testing?
For evaluating mathematical edge — yes, completely. The simulator has no house variance beyond what the math allows. For evaluating how a strategy makes you FEEL under real-stake pressure — no, only real money tells you that. Use both.