Risk of ruin calculator

The chance a run of bad luck wipes out your bankroll, from your win rate, price and units in the bank.

Typical priceAmerican (+150, -110) or decimal (2.5)Your true win rate (%)Bankroll in unitsBankroll ÷ bet size

Risk of going broke

0.39%

Edge per bet

5.00%

Break-even win %

52.38%

Units for under 1% risk

With no edge, ruin is only a matter of time. Flat 1-unit bets; a drift-diffusion estimate, so treat it as a guide, not a guarantee.

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