Breakeven win rate is the minimum percentage of trades that must be winners, given a specific risk-reward ratio, for a strategy to avoid a net loss over time: Breakeven Win Rate = Risk ÷ (Risk + Reward). A more favorable risk-reward ratio requires a lower win rate to remain profitable.
Related Reading
See a full worked table connecting ratios to breakeven win rates in Risk-Reward Ratio: How to Evaluate Every Trade.