Know the real odds behind every provably-fair game
OriginalsOdds is a free toolbox of provably-fair casino calculators. For every popular original on modern crypto casinos — Mines, Dice, Plinko, Limbo, Aviator, Crash, Wheel, Roulette and more — we show the exact win chance, the fair multiplier and the true house edge, using the same math the games run on. No hype, no fake "predictors", just the numbers.
How provably-fair gambling works
Provably-fair is what separates a transparent crypto casino from a black box. The casino generates and commits to a hashed server seed before you place a bet. That seed is combined with your client seed and a nonce (the round counter), and the result is hashed to produce a random number — which maps to the game outcome. Because the server seed was committed in advance and revealed afterwards, you can recompute the hash and prove the game result was fair and unchanged. Our provably-fair verifier does exactly that in your browser.
Every calculator, real math
Fairness doesn't mean you have an edge — the casino still keeps a small margin on every bet. Our calculators make that margin visible. Enter your parameters and each tool returns the win probability, the fair multiplier (typically 0.99 × true odds, i.e. a 1% house edge) and your expected loss. The calculations run entirely in your browser, so nothing you type is sent anywhere.
House edge is the number that matters
House edge equals 100% − RTP. It's the long-run advantage baked into the rules, and it's why, over enough rounds, the house wins. Understanding it is the single most useful thing you can do before you play — which is why every page here leads with the real odds. Compare the edge of every game side by side in the House Edge Lab.