Rule of thumb: 1% of bankroll per round for Originals, 0.5% for high-volatility slots.
Why bet size is the only variable you control
You cannot change a game's house edge or its volatility. You can change how much of your bankroll each round risks — and that single decision determines whether a bad streak is a dull evening or a wiped account. The calculator models a session as a random walk with drift (the house edge) and spread (volatility), then estimates how likely the walk is to hit zero before the session ends.
Reading the outputs
- Bet as % of bankroll — above 2% you are in gambling-for-the-tail territory; 0.5–1% is sustainable.
- Expected session cost — bet × rounds × effective edge (after rakeback).
- Typical swing — one standard deviation of session results. On a high-volatility slot this dwarfs the expected cost, which is the whole appeal.
- Chance to bust — approximate probability the bankroll hits zero during the session. Not a guarantee either way.
- Sessions until expected bust — bankroll ÷ expected cost per session: how many sessions the house edge alone would take to drain you at this pace.
- Recommended max bet — 1% of bankroll (0.5% for high-volatility games).
Bankroll and bonuses
Bonus funds raise your bankroll but also force volume (wagering). Use the wagering calculator to find the required volume, then set a bet size here that lets you complete that volume with a tolerable bust probability. Rakeback reduces the effective edge; enter your rate to see the difference — at Thrill's top tier a 1% game becomes a 0.3% game, which materially lengthens a bankroll.
Session discipline, Canadian edition
Set a session budget in Canadian dollars before converting to crypto, and remember that the coin's price moves too. A CA$200 bankroll in BTC can be CA$190 or CA$210 by the end of a weekend without a single bet. Stablecoins (USDT, USDC) remove that variable; most of our brands accept them with low fees on the TRC-20 or Solana networks. If you ever feel the budget slipping, every casino on our list offers deposit limits and self-exclusion — see our responsible gambling page.
Frequently asked questions
What bet size should I use with a CA$100 bankroll?
CA$1 per round on Originals, CA$0.50 on high-volatility slots. That is 1% and 0.5% respectively.
Does rakeback change the recommended bet?
It lowers the effective edge and slightly lengthens the bankroll, but variance dominates short sessions. Keep the same sizing; treat rakeback as a bonus.
Is 'risk of ruin' exact?
No — it is an estimate from a normal approximation with a correction for in-session bust. Use it to compare bet sizes, not as a precise probability.
Should I bet in stablecoins?
If you want your bankroll in Canadian-dollar terms to stay stable, yes. USDT/USDC on TRC-20 or Solana have low fees at every brand we track.