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Free Tool · Updated Jul 2026

CRYPTO GAMBLING BANKROLL CALCULATOR

Enter your bankroll, bet size and house edge to see how many bets your bankroll lasts, the right bet size for your target sessions, and your real risk of ruin — built around the 1-2% rule.

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Built by Alex Mercer · Crypto-casino analyst
Independent, data-led tool — see our methodology · Last updated
Enter Your Bankroll Plan
Fixed $ Amount
% of Bankroll
Flat stake placed on every bet.
1% is typical for provably fair dice/crash; slots run 3-5%.
How many sessions you want this bankroll to survive.
Results
Your Bet Size $10.00
Bet as % of Bankroll 1.00%
Expected Loss Per Bet -$0.10
Bets Until Expected Depletion 10,000
Sessions Until Depletion 50.0
Bet Size for 20 Sessions $25.00
Risk of Ruin (one session) 0.0%

📊 Your Bet-Sizing Verdict

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BET SIZE vs SURVIVAL

How your bet-as-%-of-bankroll changes longevity and risk of ruin, computed at your current house edge and session length.

Bet % of BankrollBet SizeExpected Loss / BetBets Until DepletionSessions LastedRisk of Ruin / Session

How The Bankroll Calculator Works

Bankroll management is the single most important skill in gambling that has nothing to do with picking games. You cannot change the house edge — every crypto casino game is mathematically tilted against you — but you can control how long your money lasts, how violent the swings feel, and how likely you are to walk away with something instead of nothing. This calculator turns those decisions into hard numbers. Enter your bankroll, your bet size (as a fixed amount or a percentage), the house edge of the game you play, and how long your sessions run, and it returns the four figures that actually govern your survival.

The tool is deliberately honest. It will never tell you a bet size that "beats" the casino, because no such size exists. What it tells you is exactly how fast a given plan is expected to erode your bankroll, and how likely a single bad session is to bust you — so you can choose limits you can live with before you ever place a bet.

Bets Until Depletion

The clearest way to feel the house edge is to ask: if I just keep flat-betting, how many wagers until the edge alone eats my whole bankroll? Each bet costs you, on average, the house edge times your stake. So the expected number of bets your bankroll survives is:

Bets until depletion = Bankroll / (House Edge × Bet Size)
Example: $1,000 / (0.01 × $10) = 10,000 bets at a 1% edge and a $10 flat bet.

That figure is an expectation, not a guarantee. Variance means you might bust far sooner on a cold streak, or run well above it on a hot one. But it is the honest centre of gravity for your bankroll, and it scales in the obvious ways: double your bet and you halve your bet count; double the house edge and you halve it again. Want to confirm the edge a specific game charges before you trust this number? Run it through our house edge calculator first.

Recommended Bet Size For X Sessions

Most players think in sessions, not raw bet counts. If you know roughly how many bets you place per session and how many sessions you want your bankroll to last, you can invert the formula above to find the largest bet that still keeps you (on expectation) inside that budget:

Recommended bet = Bankroll / (House Edge × Bets per Session × Sessions)
Example: $1,000 / (0.01 × 200 × 20) = $25 per bet to stretch across 20 sessions.

Bet larger than this and you are statistically expected to run dry before you reach your session goal; bet smaller and your bankroll should outlast it with room to spare. The calculator surfaces this figure in green so you can compare it directly against the bet size you actually entered. If your chosen bet is well above the recommendation, that is the tool telling you to scale down.

The 1-2% Rule

The professional rule of thumb — borrowed from poker and trading risk management — is to risk no more than 1-2% of your bankroll on any single bet. On a $1,000 bankroll that is a $10-$20 maximum. The reason is not superstition; it is mathematics. Risk of ruin is hypersensitive to the ratio of bet size to bankroll, so a 1% unit gives your bankroll roughly 100 units of cushion to ride out variance, while a 10% unit can be wiped out by a single ugly streak.

Why 1% is so powerful: In an even-money game, cutting your bet size roughly squares your survival odds. A player betting 1% of bankroll can absorb a losing run that would obliterate a player betting 10% — even though both face the identical house edge. Unit sizing protects you far more than game selection does.

Switch the calculator to "% of Bankroll" mode and watch the risk-of-ruin figure collapse as you move from 10% down to 1%. That single lever does more for your survival than any game choice, betting system, or "strategy" ever could.

Risk Of Ruin Explained

Risk of ruin is the probability your bankroll reaches zero before your session ends. This calculator estimates it with a Monte Carlo simulation: it plays out thousands of sessions at your exact bet size and house edge using an even-money bet model (a fair coin shaded by the house edge, like a 2× crash target or a 50/50 dice bet), then counts how many sessions bust. A simulation is used rather than a tidy formula because real bankroll paths are lumpy, and Monte Carlo captures the fat-tailed bad runs that closed-form approximations tend to understate.

Three things push risk of ruin up: a bigger bet relative to bankroll, a higher house edge, and a longer session (more bets means more chances to hit a fatal streak). The comparison table above shows all of this at a glance, sweeping bet size from 0.5% to 25% of your bankroll so you can see the cliff edge for yourself.

Using This Tool Responsibly

No amount of clever bet sizing changes the fundamental truth: gambling is a negative-EV activity, and your expected result is a loss equal to the house edge times everything you wager. This calculator is a risk-control tool, not a profit tool. Its job is to help you set a bankroll you can afford to lose, size your bets so a single session cannot wipe you out, and decide in advance when to walk away.

Treat your bankroll as an entertainment budget — money you have already accepted you might lose — and never top it up mid-session to chase losses, which is the fastest route to real harm. If you find yourself betting more than you planned, hiding losses, or gambling to feel better, please step back and read our responsible gambling resources. For the math behind individual games, pair this with our crash auto-cashout calculator, our bonus calculator, our Kelly criterion calculator for +EV bet sizing, and our rakeback calculator. When you are ready to play within sane limits, our best crypto casinos list only features sites with independently verified provably fair games and fast withdrawals.

Inputs & outputs at a glance

  • Bankroll — the total you are willing to risk. Every figure scales from it.
  • Bet size — fixed dollars or a % of bankroll. The single biggest driver of risk of ruin.
  • House edge — sets your per-bet expected loss (edge × bet) and your depletion rate.
  • Bets per session & target sessions — translate raw bet counts into a session budget and the recommended bet size.
FREQUENTLY ASKED QUESTIONS
The 1% rule means risking no more than 1% of your total bankroll on any single bet. On a $1,000 bankroll that is a $10 maximum bet. Keeping bets in the 1-2% range dramatically extends how many wagers your bankroll can absorb and lowers your risk of ruin, because no single losing streak can wipe you out quickly. It does not make a negative-edge game profitable; it simply makes your bankroll last far longer and smooths the swings.
On expected value, your bankroll lasts roughly bankroll ÷ (house edge × bet size) bets. For example, a $1,000 bankroll betting $10 at a 1% house edge has an expected life of about 1,000 / (0.01 × 10) = 10,000 bets before the edge alone erodes it. Real results vary widely around that average because of variance, which is why this calculator also reports a Monte Carlo risk of ruin.
To make your bankroll survive a target number of sessions on expected value, size each bet at bankroll ÷ (house edge × bets per session × number of sessions). The calculator does this for you: enter your bankroll, house edge, bets per session and how many sessions you want, and it returns the recommended bet size. Betting larger than this figure means you are statistically expected to run dry before hitting your session goal.
Risk of ruin is the probability your bankroll hits zero before your session ends. This calculator estimates it with a Monte Carlo simulation that plays out thousands of even-money sessions at your chosen bet size and house edge, then counts how many bust. Larger bets relative to bankroll, higher house edges and longer sessions all push risk of ruin up. Flat betting around 1% of bankroll typically keeps it very low.
No. Every casino game carries a house edge, so your long-run expected value is negative no matter how you size your bets. Bankroll management cannot turn a losing game into a winning one. What it does is control variance and survival time: it stops you from going broke in a single bad session, makes your entertainment budget last, and removes the tilt-driven over-betting that destroys most bankrolls. Treat it as risk control, not a profit system.
Because risk of ruin is extremely sensitive to the ratio of bet size to bankroll. Halving your bet size roughly squares your survival odds in an even-money game. A bet of 10% of bankroll can bust in a single bad streak, while a bet of 1% gives the bankroll dozens of units of cushion to ride out variance. This is why professional risk managers obsess over unit sizing far more than over picking the right game.