Free tools

Free Gambling Maths Tools

Work out the real odds before you play. Every tool runs in your browser, needs no account, and shows the formula behind its numbers.

Martingale Strategy Calculator and Simulator
Simulate the martingale strategy with your own bankroll, odds and table limit.
Kelly Criterion Calculator With Risk of Ruin
Optimal bet size for any odds, with the exact risk of ruin for each stake.
Plinko Simulator: Drop Balls, See the Real Odds
Drop thousands of balls on real Plinko tables and compare them with the exact odds.
Mines Calculator: Odds and Multipliers for Any Board
Survival odds and multipliers for any mines board, mine count and house edge.
Keno Odds Calculator: Hit Odds and Paytable Return
Exact hit odds for any keno board, and the house edge of any paytable.
Provably Fair Checker: Verify a Round Yourself
Recompute any Gift Club round from its seeds, in your browser.