Probability tools
Provably fair fixes the number. These calculators tell you what the number was worth: how often an outcome happens under the published construction, and what that implies for the return. Each one is exact arithmetic on the stated model, runs in your browser and keeps its inputs in the URL so you can send a result to someone.
- Losing-streak oddsexact
Losing-streak odds
How likely a run of n losses is somewhere in m bets, exactly.
At Dice 49.5%, a streak of 8 or more appears in 1,000 bets with probability 87.99%.
Open the calculator - Mines survival oddsexact
Mines survival odds
Probability of clearing k tiles with m mines, fair and paid multipliers, whole table.
3 mines, 5 safe picks: 49.57% survival, 1 in 2.02.
Open the calculator - Crash target oddsexact
Crash target odds
Chance a Stake-style Crash or Limbo round reaches a target, and the return per unit staked.
A round reaches 2× 49.50% of the time; the return is 0.99 per unit at any target.
Open the calculator - Plinko bucket oddsexact
Plinko bucket odds
Binomial bucket probabilities, per-bucket EV and the exact RTP of each published table, charted.
16 rows, high risk: RTP 98.9764%; the 1000× bucket is 1 in 32,768 counting both edges.
Open the calculator - Dice calculatorexact
Dice calculator
Win chance to multiplier and payout for a stake under the 99% rule, and the exact share of the 10,001 rolls.
49.5% pays 2.0000×; a stake of 10 returns 20.00 on a win and loses 0.10 per bet in expectation.
Open the calculator
Looking for a calculator by name? Dice calculator · Mines calculator · Crash calculator · Plinko calculator. Each is the same arithmetic with a worked table for the common settings.
None of this is advice. A streak calculator cannot make a streak less likely, and no cashout point changes a 1% edge. The tools exist so the numbers a casino shows you can be checked against the construction it publishes. For the derivations themselves, see the game maths pages.